{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68229",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-68229"
  ],
  "published": "2026-08-10T12:08:00Z",
  "summary": "media: cedrus: skip invalid H.264 reference list entries",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: cedrus: skip invalid H.264 reference list entries\n\nCedrus consumes H.264 ref_pic_list0/ref_pic_list1 entries from the\nstateless slice control and later uses their indices to look up\ndecode->dpb[] in _cedrus_write_ref_list().\n\nRejecting such controls in cedrus_try_ctrl() would break existing\nuserspace, since stateless H.264 reference lists may legitimately carry\nout-of-range indices for missing references. Instead, guard the actual\nDPB lookup in Cedrus and skip entries whose indices do not fit the fixed\nV4L2_H264_NUM_DPB_ENTRIES array.\n\nThis keeps the fix local to the driver use site and avoids out-of-bounds\nreads from malformed or unsupported reference list entries.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.183",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68229"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a6a109771c51920beb620f30778c29da823cc34c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7ff6f728a2433b420bb372cb0e8a4eea3f2e1a4b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1db34683b0fbbcb3bc162380c11514ea0a44e8ab"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2ee8327c85b3ac7b532d2d6a1e3a295d5ad7414a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0af8945fcae742d099f59f3c725eb67235953a31"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9924cb548ee7753a6473997949c3ec48092de0b0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e53112c2de88982e66c369aee2120d5efd78df30"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/10358ea986c3c85516d1c8206486464f79d36e76"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-19T16:47:12Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is reached only through the local V4L2 interface on the cedrus video device node (/dev/videoN) via VIDIOC_S_EXT_CTRLS plus QBUF/STREAMON ioctls. There is no remote or network-facing path to the stateless H.264 decoder.\nAC:L - The attacker fully and deterministically controls the out-of-range value: ref_pic_list0/1[i].index is a u8 copied verbatim from the control payload with no validation, so any index in 16..255 immediately produces the out-of-bounds dpb[] access on the next decode run. No race, timing, or uncontrollable memory-layout condition is involved.\nPR:L - Only an unprivileged local account with access to the cedrus video device node is needed (typically the 'video' group, or the media/camera service on Android and embedded Allwinner devices). No capability, CAP_SYS_ADMIN, or root check exists anywhere on the path \u2014 cedrus_try_ctrl() validates only SPS chroma format and bit depth.\nUI:N - The attacking process performs the entire sequence itself \u2014 open the device, set the crafted H.264 slice-params control, queue buffers, start streaming. No victim action, file open, or media mount is required.\nS:U - The out-of-bounds read stays within the kernel's own memory and security authority; no VM, IOMMU, or sandbox boundary is crossed. This is a standard in-kernel driver memory-safety defect.\nC:H - decode->dpb[] holds 16 32-byte entries at the start of a ~560-byte control allocation, so an attacker-chosen index up to 255 reads at offset 8160 \u2014 about 7.6 KB of adjacent kernel heap beyond the object. The read flags/reference_ts values are consumed by the ACTIVE test and vb2_find_buffer() timestamp lookup, giving an attacker-steerable oracle over unrelated kernel heap contents.\nI:N - The defect is purely a read: num_ref is bounded to V4L2_H264_REF_LIST_LEN by v4l2-ctrls-core.c, so the sram_array[CEDRUS_MAX_REF_IDX] stores stay in bounds, and only a legitimately-looked-up buffer position is written to hardware SRAM. No kernel memory is modified out of bounds.\nA:H - Reading several kilobytes past the end of a slab object can walk off the slab page into an unmapped or poisoned region, and trips KASAN/hardening checks, producing a kernel oops. The trigger is trivially repeatable from an unprivileged process, so the crash can be induced at will."
    }
  }
}