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CVE-2026-89724 (GCVE-0-2026-89724)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-14 12:02
VLAI
Title
media: vicodec: fix out-of-bounds write in FWHT encoder
Summary
In the Linux kernel, the following vulnerability has been resolved: media: vicodec: fix out-of-bounds write in FWHT encoder vidioc_s_fmt_vid_out() sizes the encoder CAPTURE buffer from the compressed descriptor pixfmt_fwht, whose sizeimage_mult is 3: coded_w * coded_h * 3 + sizeof(struct fwht_cframe_hdr). fwht_encode_frame() encodes one plane per component, and an incompressible plane takes the FWHT_FRAME_UNENCODED path in encode_plane(), copying the plane verbatim. For a 4-component pixel format all four planes are full resolution (width_div == height_div == 1), so a frame that forces every plane through the unencoded fallback writes sizeof(struct fwht_cframe_hdr) + 4 * coded_w * coded_h bytes, overrunning the plane by coded_w * coded_h, which can result in corruption of adjacent kernel heap memory. Bump pixfmt_fwht.sizeimage_mult from 3 to 4, matching the largest components_num among the supported raw formats, so the capture buffer is always large enough for the unencoded fallback.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 16ecf6dff97ce0194a7126e26159492668d47a7e , < f7ae26c100a6c26c2a166d2c41e73188067b36bd (git)
Affected: 16ecf6dff97ce0194a7126e26159492668d47a7e , < 6ea647e76c44387d5c1c635df4604c2154d9060e (git)
Affected: 16ecf6dff97ce0194a7126e26159492668d47a7e , < d40838a63f2bd6a3df0a6cdd8ff1d5c6366e8fff (git)
Affected: 16ecf6dff97ce0194a7126e26159492668d47a7e , < e21cccc29b840930cd9dcfdf1139658063a681af (git)
Affected: 16ecf6dff97ce0194a7126e26159492668d47a7e , < 84cfebf7f4229d748cca8eb9c4e1f1c4099d3ab7 (git)
Affected: 16ecf6dff97ce0194a7126e26159492668d47a7e , < 8c14472431e27f13661d0db9d837156eaced0ecb (git)
Affected: 16ecf6dff97ce0194a7126e26159492668d47a7e , < b95315ffc66b39856396c1043618bb4e4d5785ba (git)
Affected: 16ecf6dff97ce0194a7126e26159492668d47a7e , < cf4500ebf6fb57bf4ab83c3dd349a40257dbe2a9 (git)
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Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: vicodec: fix out-of-bounds write in FWHT encoder\n\nvidioc_s_fmt_vid_out() sizes the encoder CAPTURE buffer from the\ncompressed descriptor pixfmt_fwht, whose sizeimage_mult is 3:\ncoded_w * coded_h * 3 + sizeof(struct fwht_cframe_hdr). fwht_encode_frame()\nencodes one plane per component, and an incompressible plane takes the\nFWHT_FRAME_UNENCODED path in encode_plane(), copying the plane verbatim.\n\nFor a 4-component pixel format all four planes are full resolution\n(width_div == height_div == 1), so a frame that forces every plane\nthrough the unencoded fallback writes\nsizeof(struct fwht_cframe_hdr) + 4 * coded_w * coded_h bytes, overrunning\nthe plane by coded_w * coded_h, which can result in corruption\nof adjacent kernel heap memory.\n\nBump pixfmt_fwht.sizeimage_mult from 3 to 4, matching the largest\ncomponents_num among the supported raw formats, so the capture buffer is\nalways large enough for the unencoded fallback."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The overflow is reached only through local V4L2 ioctls (VIDIOC_S_FMT, VIDIOC_REQBUFS, VIDIOC_QBUF, VIDIOC_STREAMON) on the vicodec stateful-encoder /dev/videoN node; there is no network or adjacent-protocol path into fwht_encode_frame().\nAC:L - An attacker selects a 4-component OUTPUT format (RGBA32/ARGB32 and similar), feeds incompressible planes (and may set QP=1), and starts streaming so every plane takes the FWHT_FRAME_UNENCODED copy path; no race or uncontrolled memory-layout precondition is required.\nPR:L - vicodec_open() and the encoder ioctl path perform no capability checks; any local user who can open the video node (video group or logind/udev uaccess on desktops, Android, and media CI) can trigger the overflow.\nUI:N - The attacking process opens the encoder node, sets the 4-component format, queues incompressible buffers, and starts streaming itself; no victim action or cooperation is required.\nS:U - The out-of-bounds write corrupts kernel memory in the same security authority as the kernel itself; this is a conventional in-kernel vmalloc/heap overflow, not a VM, IOMMU, or sandbox boundary crossing.\nC:H - encode_plane() writes past the vb2 capture plane into adjacent kernel memory, and that heap/vmalloc corruption is leverageable for kernel information disclosure, matching C:H for comparable V4L2 out-of-bounds writes.\nI:H - This is an out-of-bounds write of attacker-controlled pixel bytes (0xff remapped to 0xfe) of coded_w*coded_h bytes (at least 640x360) past the capture buffer, a classic kernel memory-corruption primitive suitable for control-flow hijacking.\nA:H - Writing hundreds of kilobytes past the allocated capture plane hits a vmalloc guard page or corrupts neighbouring objects, producing a kernel oops or panic that an unprivileged user can re-trigger at will."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/6ea647e76c44387d5c1c635df4604c2154d9060e"
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    "dateReserved": "2026-09-11T19:38:34.759Z",
    "dateUpdated": "2026-09-14T12:02:14.948Z",
    "state": "PUBLISHED"
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coded_w * coded_h bytes, overrunning\\nthe plane by coded_w * coded_h, which can result in corruption\\nof adjacent kernel heap memory.\\n\\nBump pixfmt_fwht.sizeimage_mult from 3 to 4, matching the largest\\ncomponents_num among the supported raw formats, so the capture buffer is\\nalways large enough for the unencoded fallback.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/media/test-drivers/vicodec/vicodec-core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"16ecf6dff97ce0194a7126e26159492668d47a7e\",\"lessThan\":\"f7ae26c100a6c26c2a166d2c41e73188067b36bd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"16ecf6dff97ce0194a7126e26159492668d47a7e\",\"lessThan\":\"6ea647e76c44387d5c1c635df4604c2154d9060e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"16ecf6dff97ce0194a7126e26159492668d47a7e\",\"lessThan\":\"d40838a63f2bd6a3df0a6cdd8ff1d5c6366e8fff\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"16ecf6dff97ce0194a7126e26159492668d47a7e\",\"lessThan\":\"e21cccc29b840930cd9dcfdf1139658063a681af\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"16ecf6dff97ce0194a7126e26159492668d47a7e\",\"lessThan\":\"84cfebf7f4229d748cca8eb9c4e1f1c4099d3ab7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"16ecf6dff97ce0194a7126e26159492668d47a7e\",\"lessThan\":\"8c14472431e27f13661d0db9d837156eaced0ecb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"16ecf6dff97ce0194a7126e26159492668d47a7e\",\"lessThan\":\"b95315ffc66b39856396c1043618bb4e4d5785ba\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"16ecf6dff97ce0194a7126e26159492668d47a7e\",\"lessThan\":\"cf4500ebf6fb57bf4ab83c3dd349a40257dbe2a9\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/media/test-drivers/vicodec/vicodec-core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"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:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6ea647e76c44387d5c1c635df4604c2154d9060e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/84cfebf7f4229d748cca8eb9c4e1f1c4099d3ab7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8c14472431e27f13661d0db9d837156eaced0ecb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b95315ffc66b39856396c1043618bb4e4d5785ba\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cf4500ebf6fb57bf4ab83c3dd349a40257dbe2a9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d40838a63f2bd6a3df0a6cdd8ff1d5c6366e8fff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e21cccc29b840930cd9dcfdf1139658063a681af\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f7ae26c100a6c26c2a166d2c41e73188067b36bd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-15T11:02:37+00:00",
      "cve": "CVE-2026-89724",
      "id": "CVE-2026-89724",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_not_affected": "276",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: media: vicodec: fix out-of-bounds write in FWHT encoder",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89724.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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Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.