CVE-2026-89724

Full vulnerability record from the local CVENow database.

Description

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

HIGH

CVSS score

7.8 (v3.1)

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-11 20:20:02.050000

Last modified

2026-10-19 09:18:13.167000

View original CVE JSON

{
  "id": "CVE-2026-89724",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-11T20:20:02.050",
  "lastModified": "2026-10-19T09:18:13.167",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "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."
    }
  ],
  "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",
              "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"
    },
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    },
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      "url": "https://git.kernel.org/stable/c/8c14472431e27f13661d0db9d837156eaced0ecb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
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    {
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}