{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-90220",
  "modified": "2026-10-07T14:35:31Z",
  "upstream": [
    "CVE-2026-90220"
  ],
  "published": "2026-09-17T16:10:40Z",
  "summary": "ALSA: seq: Don't leak the extension cell pointer in the bounce payload",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: seq: Don't leak the extension cell pointer in the bounce payload\n\nThe bounce_error_event() embeds the failed event in the bounce payload\nby pointing data.ext.ptr at it.  When that event is a queued\nvariable-length event, its own data.ext.ptr holds the address of its\nfirst extension cell, put there by snd_seq_event_dup().  The payload\ngoes out verbatim through snd_seq_expand_var_event(), so the address\nreaches userspace.\n\nThat is the same address commit 705dd6dcbc0e (\"ALSA: seq: Clear\nvariable event pointer on read\") removed from the event header.  The\nread path still clears it there, just above the call that expands the\npayload.\n\nEmbed a sanitised copy instead, treated exactly as snd_seq_read()\ntreats the header.  A stack copy is enough because delivery is\nsynchronous and snd_seq_event_dup() copies before returning.\n\nAn unprivileged client reaches this by setting SNDRV_SEQ_FILTER_BOUNCE,\nqueueing a variable-length event to a port that does not exist and\nreading the bounce back.  Eight bytes on 64-bit, from its own pool.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.12.109-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.12.109+rpt-rpi-2712",
            "binary_version": "1:6.12.109-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.109+rpt-rpi-v6",
            "binary_version": "1:6.12.109-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.109+rpt-rpi-v7",
            "binary_version": "1:6.12.109-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.109+rpt-rpi-v7l",
            "binary_version": "1:6.12.109-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.109+rpt-rpi-v8",
            "binary_version": "1:6.12.109-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.109+rpt-rpi-v8-rt",
            "binary_version": "1:6.12.109-1+rpt1"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.12.109-1+rpt1": {
            "linux_commit": "7d1826930811232688a50c99c540fbb137aed081",
            "upstream_version": "6.12.109",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.110"
          }
        }
      }
    },
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:13",
        "name": "linux"
      },
      "versions": [
        "1:6.18.50-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.18.50+rpt-rpi-2712",
            "binary_version": "1:6.18.50-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.50+rpt-rpi-v6",
            "binary_version": "1:6.18.50-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.50+rpt-rpi-v7",
            "binary_version": "1:6.18.50-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.50+rpt-rpi-v8",
            "binary_version": "1:6.18.50-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.50+rpt-rpi-v8-rt",
            "binary_version": "1:6.18.50-1+rpt1"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.18.50-1+rpt1": {
            "linux_commit": "cff533aec2fa601846766b32ff57204e0a61bed7",
            "upstream_version": "6.18.50",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.52"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-90220"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/42c3f856d13a91a0d4c302a0c6854813621136db"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b1e8d40663997aacaa198f37ce6893e07aaba77a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6e6e471eef1d5d8cb056c7d364023fe048249204"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/59e1592d3c270ff4642d5d6dc55c545306eb0693"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-17T16:10:40Z"
  }
}