CVE-2026-68229 (GCVE-0-2026-68229)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:00 – Updated: 2026-08-19 16:32
VLAI
Title
media: cedrus: skip invalid H.264 reference list entries
Summary
In the Linux kernel, the following vulnerability has been resolved: media: cedrus: skip invalid H.264 reference list entries Cedrus consumes H.264 ref_pic_list0/ref_pic_list1 entries from the stateless slice control and later uses their indices to look up decode->dpb[] in _cedrus_write_ref_list(). Rejecting such controls in cedrus_try_ctrl() would break existing userspace, since stateless H.264 reference lists may legitimately carry out-of-range indices for missing references. Instead, guard the actual DPB lookup in Cedrus and skip entries whose indices do not fit the fixed V4L2_H264_NUM_DPB_ENTRIES array. This keeps the fix local to the driver use site and avoids out-of-bounds reads from malformed or unsupported reference list entries.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e000e1fa4bdbd783149e7f97cf3be61e1c0bab8c , < a6a109771c51920beb620f30778c29da823cc34c (git)
Affected: e000e1fa4bdbd783149e7f97cf3be61e1c0bab8c , < 7ff6f728a2433b420bb372cb0e8a4eea3f2e1a4b (git)
Affected: e000e1fa4bdbd783149e7f97cf3be61e1c0bab8c , < 1db34683b0fbbcb3bc162380c11514ea0a44e8ab (git)
Affected: e000e1fa4bdbd783149e7f97cf3be61e1c0bab8c , < 2ee8327c85b3ac7b532d2d6a1e3a295d5ad7414a (git)
Affected: e000e1fa4bdbd783149e7f97cf3be61e1c0bab8c , < 0af8945fcae742d099f59f3c725eb67235953a31 (git)
Affected: e000e1fa4bdbd783149e7f97cf3be61e1c0bab8c , < 9924cb548ee7753a6473997949c3ec48092de0b0 (git)
Affected: e000e1fa4bdbd783149e7f97cf3be61e1c0bab8c , < e53112c2de88982e66c369aee2120d5efd78df30 (git)
Affected: e000e1fa4bdbd783149e7f97cf3be61e1c0bab8c , < 10358ea986c3c85516d1c8206486464f79d36e76 (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "lang": "en",
          "value": "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-\u003edpb[] 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."
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "value": "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 \u0027video\u0027 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\u0027s 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-\u003edpb[] 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."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "media: cedrus: skip invalid H.264 reference list entries",
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    "cveId": "CVE-2026-68229",
    "datePublished": "2026-08-10T12:00:51.935Z",
    "dateReserved": "2026-07-30T09:28:09.376Z",
    "dateUpdated": "2026-08-19T16:32:01.546Z",
    "state": "PUBLISHED"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/staging/media/sunxi/cedrus/cedrus_h264.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e000e1fa4bdbd783149e7f97cf3be61e1c0bab8c\",\"lessThan\":\"a6a109771c51920beb620f30778c29da823cc34c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e000e1fa4bdbd783149e7f97cf3be61e1c0bab8c\",\"lessThan\":\"7ff6f728a2433b420bb372cb0e8a4eea3f2e1a4b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e000e1fa4bdbd783149e7f97cf3be61e1c0bab8c\",\"lessThan\":\"1db34683b0fbbcb3bc162380c11514ea0a44e8ab\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e000e1fa4bdbd783149e7f97cf3be61e1c0bab8c\",\"lessThan\":\"2ee8327c85b3ac7b532d2d6a1e3a295d5ad7414a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e000e1fa4bdbd783149e7f97cf3be61e1c0bab8c\",\"lessThan\":\"0af8945fcae742d099f59f3c725eb67235953a31\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e000e1fa4bdbd783149e7f97cf3be61e1c0bab8c\",\"lessThan\":\"9924cb548ee7753a6473997949c3ec48092de0b0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e000e1fa4bdbd783149e7f97cf3be61e1c0bab8c\",\"lessThan\":\"e53112c2de88982e66c369aee2120d5efd78df30\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e000e1fa4bdbd783149e7f97cf3be61e1c0bab8c\",\"lessThan\":\"10358ea986c3c85516d1c8206486464f79d36e76\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/staging/media/sunxi/cedrus/cedrus_h264.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.10\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0af8945fcae742d099f59f3c725eb67235953a31\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/10358ea986c3c85516d1c8206486464f79d36e76\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1db34683b0fbbcb3bc162380c11514ea0a44e8ab\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2ee8327c85b3ac7b532d2d6a1e3a295d5ad7414a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7ff6f728a2433b420bb372cb0e8a4eea3f2e1a4b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9924cb548ee7753a6473997949c3ec48092de0b0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a6a109771c51920beb620f30778c29da823cc34c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e53112c2de88982e66c369aee2120d5efd78df30\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-13T23:15:23+00:00",
      "cve": "CVE-2026-68229",
      "id": "CVE-2026-68229",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_not_affected": "276",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: media: cedrus: skip invalid H.264 reference list entries",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68229.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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