{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89771",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89771"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "ring-buffer: Fix subbuf resize race with ring buffer readers",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Fix subbuf resize race with ring buffer readers\n\ntrace_buffer subbuf_size is read lockless in ring_buffer_read_page() and\nring_buffer_read_start(), while it can simultaneously be resized with\nring_buffer_subbuf_order_set().\n\nInstead of trace_buffer::subbuf_size, use bpage::order in\nring_buffer_read_start() and ring_buffer_read_page().\n\nIn ring_buffer_read_start(), even with resize_disabled, there is still a\npossibility of a race with a buffer modification. Hold the trace_buffer\nmutex to synchronise with any pending ring buffer order modification.\n\ntrace_buffer::subbuf_size is now actually useless, remove it. Also,\ncreate accessors rb_subbuf_capacity() and rb_page_capacity() which\nreturn the actual size available for storing events, while\nrb_subbuf_size() returns the actual subbuf page-size.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.12.20-1+rpt1~bpo12+1",
        "1:6.12.25-1+rpt1",
        "1:6.12.34-1+rpt1~bookworm",
        "1:6.12.47-1+rpt1~bookworm",
        "1:6.12.62-1+rpt1~bookworm",
        "1:6.12.75-1+rpt1~bookworm",
        "1:6.12.87-1+rpt1~bookworm",
        "1:6.12.93-1+rpt1",
        "1:6.12.96-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.12.20+rpt-rpi-2712",
            "binary_version": "1:6.12.20-1+rpt1~bpo12+1"
          },
          {
            "binary_name": "linux-image-6.12.20+rpt-rpi-v6",
            "binary_version": "1:6.12.20-1+rpt1~bpo12+1"
          },
          {
            "binary_name": "linux-image-6.12.20+rpt-rpi-v7",
            "binary_version": "1:6.12.20-1+rpt1~bpo12+1"
          },
          {
            "binary_name": "linux-image-6.12.20+rpt-rpi-v7l",
            "binary_version": "1:6.12.20-1+rpt1~bpo12+1"
          },
          {
            "binary_name": "linux-image-6.12.20+rpt-rpi-v8",
            "binary_version": "1:6.12.20-1+rpt1~bpo12+1"
          },
          {
            "binary_name": "linux-image-6.12.25+rpt-rpi-2712",
            "binary_version": "1:6.12.25-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.25+rpt-rpi-v6",
            "binary_version": "1:6.12.25-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.25+rpt-rpi-v7",
            "binary_version": "1:6.12.25-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.25+rpt-rpi-v7l",
            "binary_version": "1:6.12.25-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.25+rpt-rpi-v8",
            "binary_version": "1:6.12.25-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.34+rpt-rpi-2712",
            "binary_version": "1:6.12.34-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.34+rpt-rpi-v6",
            "binary_version": "1:6.12.34-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.34+rpt-rpi-v7",
            "binary_version": "1:6.12.34-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.34+rpt-rpi-v7l",
            "binary_version": "1:6.12.34-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.34+rpt-rpi-v8",
            "binary_version": "1:6.12.34-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.34+rpt-rpi-v8-rt",
            "binary_version": "1:6.12.34-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.47+rpt-rpi-2712",
            "binary_version": "1:6.12.47-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.47+rpt-rpi-v6",
            "binary_version": "1:6.12.47-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.47+rpt-rpi-v7",
            "binary_version": "1:6.12.47-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.47+rpt-rpi-v7l",
            "binary_version": "1:6.12.47-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.47+rpt-rpi-v8",
            "binary_version": "1:6.12.47-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.47+rpt-rpi-v8-rt",
            "binary_version": "1:6.12.47-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.62+rpt-rpi-2712",
            "binary_version": "1:6.12.62-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.62+rpt-rpi-v6",
            "binary_version": "1:6.12.62-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.62+rpt-rpi-v7",
            "binary_version": "1:6.12.62-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.62+rpt-rpi-v7l",
            "binary_version": "1:6.12.62-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.62+rpt-rpi-v8",
            "binary_version": "1:6.12.62-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.62+rpt-rpi-v8-rt",
            "binary_version": "1:6.12.62-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.75+rpt-rpi-2712",
            "binary_version": "1:6.12.75-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.75+rpt-rpi-v6",
            "binary_version": "1:6.12.75-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.75+rpt-rpi-v7",
            "binary_version": "1:6.12.75-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.75+rpt-rpi-v7l",
            "binary_version": "1:6.12.75-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.75+rpt-rpi-v8",
            "binary_version": "1:6.12.75-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.75+rpt-rpi-v8-rt",
            "binary_version": "1:6.12.75-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.87+rpt-rpi-2712",
            "binary_version": "1:6.12.87-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.87+rpt-rpi-v6",
            "binary_version": "1:6.12.87-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.87+rpt-rpi-v7",
            "binary_version": "1:6.12.87-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.87+rpt-rpi-v7l",
            "binary_version": "1:6.12.87-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.87+rpt-rpi-v8",
            "binary_version": "1:6.12.87-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.87+rpt-rpi-v8-rt",
            "binary_version": "1:6.12.87-1+rpt1~bookworm"
          },
          {
            "binary_name": "linux-image-6.12.93+rpt-rpi-2712",
            "binary_version": "1:6.12.93-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.93+rpt-rpi-v6",
            "binary_version": "1:6.12.93-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.93+rpt-rpi-v7",
            "binary_version": "1:6.12.93-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.93+rpt-rpi-v7l",
            "binary_version": "1:6.12.93-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.93+rpt-rpi-v8",
            "binary_version": "1:6.12.93-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.93+rpt-rpi-v8-rt",
            "binary_version": "1:6.12.93-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.96+rpt-rpi-2712",
            "binary_version": "1:6.12.96-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.96+rpt-rpi-v6",
            "binary_version": "1:6.12.96-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.96+rpt-rpi-v7",
            "binary_version": "1:6.12.96-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.96+rpt-rpi-v7l",
            "binary_version": "1:6.12.96-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.96+rpt-rpi-v8",
            "binary_version": "1:6.12.96-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.96+rpt-rpi-v8-rt",
            "binary_version": "1:6.12.96-1+rpt1"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.12.20-1+rpt1~bpo12+1": {
            "linux_commit": "cd231d4775b14f228606c09f219b48308f6ab3aa",
            "upstream_version": "6.12.20",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          },
          "1:6.12.25-1+rpt1": {
            "linux_commit": "3dd2c2c507c271d411fab2e82a2b3b7e0b6d3f16",
            "upstream_version": "6.12.25",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          },
          "1:6.12.34-1+rpt1~bookworm": {
            "linux_commit": "8f77e03530f65209a377d25023e912b288e039cd",
            "upstream_version": "6.12.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          },
          "1:6.12.47-1+rpt1~bookworm": {
            "linux_commit": "359f37f0faefb712add32a39f98751aea67d5c1f",
            "upstream_version": "6.12.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          },
          "1:6.12.62-1+rpt1~bookworm": {
            "linux_commit": "a1073743767f9e7fdc7017ababd2a07ea0c97c1c",
            "upstream_version": "6.12.62",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          },
          "1:6.12.75-1+rpt1~bookworm": {
            "linux_commit": "89050b1059997d38d55462b323b099a6436dc10d",
            "upstream_version": "6.12.75",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          },
          "1:6.12.87-1+rpt1~bookworm": {
            "linux_commit": "ae4d75fb36deba0fe1a986d9bfae65755e082dd0",
            "upstream_version": "6.12.87",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          },
          "1:6.12.93-1+rpt1": {
            "linux_commit": "d8ab4e908235da7727f22dd36ad5af224671677d",
            "upstream_version": "6.12.93",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          },
          "1:6.12.96-1+rpt1": {
            "linux_commit": "ae161617d7a4552fa91d03626b8d9f3696d17481",
            "upstream_version": "6.12.96",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          }
        }
      }
    },
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:13",
        "name": "linux"
      },
      "versions": [
        "1:6.12.19-1+rpt1~bpo12+1",
        "1:6.12.19-1+rpt1",
        "1:6.12.20-1+rpt1",
        "1:6.12.25-1+rpt1+trixie",
        "1:6.12.34-1+rpt1",
        "1:6.12.47-1+rpt1",
        "1:6.12.62-1+rpt1",
        "1:6.12.75-1+rpt1",
        "1:6.18.29-1+rpt1",
        "1:6.18.33-1+rpt1",
        "1:6.18.34-1+rpt1",
        "1:6.18.39-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.12.19+rpt-rpi-2712",
            "binary_version": "1:6.12.19-1+rpt1~bpo12+1"
          },
          {
            "binary_name": "linux-image-6.12.19+rpt-rpi-v6",
            "binary_version": "1:6.12.19-1+rpt1~bpo12+1"
          },
          {
            "binary_name": "linux-image-6.12.19+rpt-rpi-v7",
            "binary_version": "1:6.12.19-1+rpt1~bpo12+1"
          },
          {
            "binary_name": "linux-image-6.12.19+rpt-rpi-v7l",
            "binary_version": "1:6.12.19-1+rpt1~bpo12+1"
          },
          {
            "binary_name": "linux-image-6.12.19+rpt-rpi-v8",
            "binary_version": "1:6.12.19-1+rpt1~bpo12+1"
          },
          {
            "binary_name": "linux-image-6.12.19+rpt-rpi-2712",
            "binary_version": "1:6.12.19-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.19+rpt-rpi-v6",
            "binary_version": "1:6.12.19-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.19+rpt-rpi-v7",
            "binary_version": "1:6.12.19-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.19+rpt-rpi-v7l",
            "binary_version": "1:6.12.19-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.19+rpt-rpi-v8",
            "binary_version": "1:6.12.19-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.20+rpt-rpi-2712",
            "binary_version": "1:6.12.20-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.20+rpt-rpi-v6",
            "binary_version": "1:6.12.20-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.20+rpt-rpi-v7",
            "binary_version": "1:6.12.20-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.20+rpt-rpi-v7l",
            "binary_version": "1:6.12.20-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.20+rpt-rpi-v8",
            "binary_version": "1:6.12.20-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.25+rpt-rpi-2712",
            "binary_version": "1:6.12.25-1+rpt1+trixie"
          },
          {
            "binary_name": "linux-image-6.12.25+rpt-rpi-v6",
            "binary_version": "1:6.12.25-1+rpt1+trixie"
          },
          {
            "binary_name": "linux-image-6.12.25+rpt-rpi-v7",
            "binary_version": "1:6.12.25-1+rpt1+trixie"
          },
          {
            "binary_name": "linux-image-6.12.25+rpt-rpi-v8",
            "binary_version": "1:6.12.25-1+rpt1+trixie"
          },
          {
            "binary_name": "linux-image-6.12.25+rpt-rpi-v8-rt",
            "binary_version": "1:6.12.25-1+rpt1+trixie"
          },
          {
            "binary_name": "linux-image-6.12.34+rpt-rpi-2712",
            "binary_version": "1:6.12.34-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.34+rpt-rpi-v6",
            "binary_version": "1:6.12.34-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.34+rpt-rpi-v7",
            "binary_version": "1:6.12.34-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.34+rpt-rpi-v8",
            "binary_version": "1:6.12.34-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.34+rpt-rpi-v8-rt",
            "binary_version": "1:6.12.34-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.47+rpt-rpi-2712",
            "binary_version": "1:6.12.47-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.47+rpt-rpi-v6",
            "binary_version": "1:6.12.47-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.47+rpt-rpi-v7",
            "binary_version": "1:6.12.47-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.47+rpt-rpi-v8",
            "binary_version": "1:6.12.47-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.47+rpt-rpi-v8-rt",
            "binary_version": "1:6.12.47-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.62+rpt-rpi-2712",
            "binary_version": "1:6.12.62-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.62+rpt-rpi-v6",
            "binary_version": "1:6.12.62-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.62+rpt-rpi-v7",
            "binary_version": "1:6.12.62-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.62+rpt-rpi-v8",
            "binary_version": "1:6.12.62-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.62+rpt-rpi-v8-rt",
            "binary_version": "1:6.12.62-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.75+rpt-rpi-2712",
            "binary_version": "1:6.12.75-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.75+rpt-rpi-v6",
            "binary_version": "1:6.12.75-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.75+rpt-rpi-v7",
            "binary_version": "1:6.12.75-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.75+rpt-rpi-v8",
            "binary_version": "1:6.12.75-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.75+rpt-rpi-v8-rt",
            "binary_version": "1:6.12.75-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.29+rpt-rpi-2712",
            "binary_version": "1:6.18.29-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.29+rpt-rpi-v6",
            "binary_version": "1:6.18.29-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.29+rpt-rpi-v7",
            "binary_version": "1:6.18.29-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.29+rpt-rpi-v8",
            "binary_version": "1:6.18.29-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.29+rpt-rpi-v8-rt",
            "binary_version": "1:6.18.29-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.33+rpt-rpi-2712",
            "binary_version": "1:6.18.33-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.33+rpt-rpi-v6",
            "binary_version": "1:6.18.33-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.33+rpt-rpi-v7",
            "binary_version": "1:6.18.33-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.33+rpt-rpi-v8",
            "binary_version": "1:6.18.33-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.33+rpt-rpi-v8-rt",
            "binary_version": "1:6.18.33-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.34+rpt-rpi-2712",
            "binary_version": "1:6.18.34-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.34+rpt-rpi-v6",
            "binary_version": "1:6.18.34-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.34+rpt-rpi-v7",
            "binary_version": "1:6.18.34-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.34+rpt-rpi-v8",
            "binary_version": "1:6.18.34-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.34+rpt-rpi-v8-rt",
            "binary_version": "1:6.18.34-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.39+rpt-rpi-2712",
            "binary_version": "1:6.18.39-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.39+rpt-rpi-v6",
            "binary_version": "1:6.18.39-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.39+rpt-rpi-v7",
            "binary_version": "1:6.18.39-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.39+rpt-rpi-v8",
            "binary_version": "1:6.18.39-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.39+rpt-rpi-v8-rt",
            "binary_version": "1:6.18.39-1+rpt1"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.12.19-1+rpt1~bpo12+1": {
            "linux_commit": "121c2c384b9c2f4790ffb31b2cd25c7d75c8fda0",
            "upstream_version": "6.12.19",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          },
          "1:6.12.19-1+rpt1": {
            "linux_commit": "121c2c384b9c2f4790ffb31b2cd25c7d75c8fda0",
            "upstream_version": "6.12.19",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          },
          "1:6.12.20-1+rpt1": {
            "linux_commit": "cd231d4775b14f228606c09f219b48308f6ab3aa",
            "upstream_version": "6.12.20",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          },
          "1:6.12.25-1+rpt1+trixie": {
            "linux_commit": "3dd2c2c507c271d411fab2e82a2b3b7e0b6d3f16",
            "upstream_version": "6.12.25",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          },
          "1:6.12.34-1+rpt1": {
            "linux_commit": "8f77e03530f65209a377d25023e912b288e039cd",
            "upstream_version": "6.12.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          },
          "1:6.12.47-1+rpt1": {
            "linux_commit": "359f37f0faefb712add32a39f98751aea67d5c1f",
            "upstream_version": "6.12.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          },
          "1:6.12.62-1+rpt1": {
            "linux_commit": "a1073743767f9e7fdc7017ababd2a07ea0c97c1c",
            "upstream_version": "6.12.62",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          },
          "1:6.12.75-1+rpt1": {
            "linux_commit": "89050b1059997d38d55462b323b099a6436dc10d",
            "upstream_version": "6.12.75",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          },
          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89771"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6d666f0b8b36c0765cf19fbe6de5a7ba5a73aad9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/50f4a793c4ff24826efb0ac700989a5063cc53df"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0c7c517827a453128a8f58bfd849546a29813b27"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8a5f63637890f03177146efddaba5ec7a1b4d61f"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-13T06:49:25Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is reached only via local tracefs: write() to buffer_subbuf_size_kb (ring_buffer_subbuf_order_set) racing with read()/splice() of per_cpu/*/trace_pipe_raw (ring_buffer_read_page) or open/read of trace (ring_buffer_read_start). No network, adjacent-radio, or physical path exists.\nAC:L - The attacker controls both sides: one thread writes buffer_subbuf_size_kb while another reads trace_pipe_raw or trace. ring_buffer_subbuf_order_set publishes the new subbuf_size before allocating replacement pages and without reader_lock, so the window includes synchronize_rcu() plus GFP_KERNEL allocation and is reliably retried.\nPR:L - tracing_check_open_get_tr() enforces only LOCKDOWN_TRACEFS and DAC with no capable() check. buffer_subbuf_size_kb is 0640 and trace_pipe_raw/trace are 0440/0640, routinely delegated via tracefs gid=/mode= to tracing-group members on Android/Perfetto, ChromeOS, and developer systems, matching CVE-2024-50207 and CVE-2026-74634.\nUI:N - Exploitation uses the attacker's own tracefs file descriptors and threads (write buffer_subbuf_size_kb while reading trace_pipe_raw or trace). No separate victim mount, click, or configuration action is required.\nS:U - The out-of-bounds memset/memcpy corrupt kernel ring-buffer pages and adjacent heap within the same OS security authority. This enables local privilege escalation but does not cross VM, IOMMU, container, or hardware trust boundaries.\nC:H - ring_buffer_read_page() uses the lockless new subbuf_size to memset/memcpy past an old-order spare or reader page, and tracing_buffers_read copy_to_user of that oversized length discloses adjacent kernel heap to userspace. The same OOB corruption is also a high-impact read primitive.\nI:H - After a passing order check, ring_buffer_read_page() memset()s (new_subbuf_size-size) bytes past the still-old data page (up to hundreds of KB when order jumps 0 to 7). That kernel heap OOB write is exploitable for arbitrary writes and control-flow hijack, not merely a crash.\nA:H - The same OOB memset/memcpy corrupt adjacent kernel objects and ring-buffer metadata, producing oops/panic. The attacker chooses the order delta via buffer_subbuf_size_kb and can retrigger the race at will."
    }
  }
}