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GHSA-F66P-93RC-M283

Vulnerability from github – Published: 2026-09-25 12:31 – Updated: 2026-09-25 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

media: v4l2-ctrls: validate HEVC tile counts

The stateless HEVC decoders read num_tile_columns_minus1 + 1 entries from column_width_minus1[] and num_tile_rows_minus1 + 1 from row_height_minus1[] and use them as tile-loop bounds, but std_validate_compound() does not bound these u8 counts. Reject a V4L2_CTRL_TYPE_HEVC_PPS with tiling enabled whose tile counts exceed the uAPI array capacity, mirroring the existing compound-control range checks.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-97576"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-25T11:17:08Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: v4l2-ctrls: validate HEVC tile counts\n\nThe stateless HEVC decoders read num_tile_columns_minus1 + 1 entries from\ncolumn_width_minus1[] and num_tile_rows_minus1 + 1 from row_height_minus1[]\nand use them as tile-loop bounds, but std_validate_compound() does not\nbound these u8 counts. Reject a V4L2_CTRL_TYPE_HEVC_PPS with tiling\nenabled whose tile counts exceed the uAPI array capacity, mirroring the\nexisting compound-control range checks.",
  "id": "GHSA-f66p-93rc-m283",
  "modified": "2026-09-25T15:31:42Z",
  "published": "2026-09-25T12:31:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97576"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/400cd78a63cc647412cf069c9851bdea2818340c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba1023d3a6d5d244d59f20c4ba6af4879ae08a9f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c7b1ef6dc57f4e57fe27cfdd3bf82033ed91ca34"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dc694a9929f7cb9c88ef91e45eb982b7bbe5a477"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-97576 (GCVE-0-2026-97576)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:21 – Updated: 2026-09-25 14:41

Title

media: v4l2-ctrls: validate HEVC tile counts

Summary

In the Linux kernel, the following vulnerability has been resolved: media: v4l2-ctrls: validate HEVC tile counts The stateless HEVC decoders read num_tile_columns_minus1 + 1 entries from column_width_minus1[] and num_tile_rows_minus1 + 1 from row_height_minus1[] and use them as tile-loop bounds, but std_validate_compound() does not bound these u8 counts. Reject a V4L2_CTRL_TYPE_HEVC_PPS with tiling enabled whose tile counts exceed the uAPI array capacity, mirroring the existing compound-control range checks.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/400cd78a63cc64741…
https://git.kernel.org/stable/c/c7b1ef6dc57f4e57f…
https://git.kernel.org/stable/c/ba1023d3a6d5d244d…
https://git.kernel.org/stable/c/dc694a9929f7cb9c8…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 256fa3920874b0f1f4cb79ad6766493a22187153 , < 400cd78a63cc647412cf069c9851bdea2818340c (git) Affected: 256fa3920874b0f1f4cb79ad6766493a22187153 , < c7b1ef6dc57f4e57fe27cfdd3bf82033ed91ca34 (git) Affected: 256fa3920874b0f1f4cb79ad6766493a22187153 , < ba1023d3a6d5d244d59f20c4ba6af4879ae08a9f (git) Affected: 256fa3920874b0f1f4cb79ad6766493a22187153 , < dc694a9929f7cb9c88ef91e45eb982b7bbe5a477 (git)
Linux	Linux	Affected: 5.5 Unaffected: 0 , < 5.5 (semver) Unaffected: 6.12.111 , ≤ 6.12.* (semver) Unaffected: 6.18.53 , ≤ 6.18.* (semver) Unaffected: 7.2.7 , ≤ 7.2.* (semver) Unaffected: 7.3-rc3 , ≤ * (original_commit_for_fix)

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{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/v4l2-core/v4l2-ctrls-core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "400cd78a63cc647412cf069c9851bdea2818340c",
              "status": "affected",
              "version": "256fa3920874b0f1f4cb79ad6766493a22187153",
              "versionType": "git"
            },
            {
              "lessThan": "c7b1ef6dc57f4e57fe27cfdd3bf82033ed91ca34",
              "status": "affected",
              "version": "256fa3920874b0f1f4cb79ad6766493a22187153",
              "versionType": "git"
            },
            {
              "lessThan": "ba1023d3a6d5d244d59f20c4ba6af4879ae08a9f",
              "status": "affected",
              "version": "256fa3920874b0f1f4cb79ad6766493a22187153",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/v4l2-core/v4l2-ctrls-core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.5"
            },
            {
              "lessThan": "5.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.7",
                  "versionStartIncluding": "5.5",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc3",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                }
              ],
              "negate": false,
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: v4l2-ctrls: validate HEVC tile counts\n\nThe stateless HEVC decoders read num_tile_columns_minus1 + 1 entries from\ncolumn_width_minus1[] and num_tile_rows_minus1 + 1 from row_height_minus1[]\nand use them as tile-loop bounds, but std_validate_compound() does not\nbound these u8 counts. Reject a V4L2_CTRL_TYPE_HEVC_PPS with tiling\nenabled whose tile counts exceed the uAPI array capacity, mirroring the\nexisting compound-control range checks."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "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 attacker-controlled bytes are num_tile_columns_minus1, num_tile_rows_minus1 and column_width_minus1[]/row_height_minus1[] in struct v4l2_ctrl_hevc_pps, copied from userspace by VIDIOC_S_EXT_CTRLS through v4l_s_ext_ctrls \u2192 v4l2_s_ext_ctrls \u2192 user_to_new into std_validate_compound(); no network protocol carries those fields.\nAC:L - Setting V4L2_HEVC_PPS_FLAG_TILES_ENABLED with num_tile_columns_minus1\u003e=20 or num_tile_rows_minus1\u003e=22 is enough; the next decode job (hantro_g2_hevc_dec_run\u2192prepare_tile_info_buffer, rkvdec assemble_hw_pps\u2192compute_tiles_non_uniform, or cedrus_h265_setup\u2192cedrus_h265_write_tiles) uses those u8 counts as loop bounds with no race or hardware-fault precondition.\nPR:L - rkvdec_open(), hantro_open() and cedrus_open() perform no capable() check; v4l2_open only requires opening the decoder /dev/videoN. On Rockchip, Allwinner and Hantro devices that node is granted to unprivileged video-group or Android media-client users, not init-namespace root.\nUI:N - The attacking process opens the HEVC decoder itself, issues VIDIOC_S_EXT_CTRLS with the crafted V4L2_CTRL_TYPE_HEVC_PPS, then QBUF/STREAMON via the request API. No separate victim mount, file-open, or playback action is required.\nS:U - The overflows remain in kernel stack (vdpu383 assemble_hw_pps column_width[22]), hantro tile_sizes DMA memory, and the rkvdec param_set PPS packet. This is kernel memory corruption under the same security authority, not a VM, IOMMU, or sandbox escape.\nC:H - cedrus_h265_write_tiles() and compute_tiles_non_uniform() index column_width_minus1[20] and row_height_minus1[22] with a u8 count up to 255, reading past the v4l2_ctrl_hevc_pps object into adjacent kernel heap that is then copied into stack and DMA tile buffers.\nI:H - compute_tiles_non_uniform() writes attacker-chosen column_width_minus1[i]+1 values past stack arrays column_width[20/22]; prepare_tile_info_buffer() writes up to 256x256 u16 pairs into a 20x22 tile_sizes DMA buffer; rkvdec_set_bw_field() stores COLUMN_WIDTH(i) past the 80-byte PPS packet.\nA:H - The stack smash of column_width/row_height, the tile_sizes DMA overflow, and rkvdec_set_bw_field() writes past param_set can walk into unmapped or poisoned memory and oops the kernel, and can wedge the HEVC decoder hardware. The trigger is repeatable at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T14:41:19.274Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/400cd78a63cc647412cf069c9851bdea2818340c"
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        {
          "url": "https://git.kernel.org/stable/c/c7b1ef6dc57f4e57fe27cfdd3bf82033ed91ca34"
        },
        {
          "url": "https://git.kernel.org/stable/c/ba1023d3a6d5d244d59f20c4ba6af4879ae08a9f"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc694a9929f7cb9c88ef91e45eb982b7bbe5a477"
        }
      ],
      "title": "media: v4l2-ctrls: validate HEVC tile counts",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97576",
    "datePublished": "2026-09-25T10:21:59.298Z",
    "dateReserved": "2026-09-24T16:01:01.156Z",
    "dateUpdated": "2026-09-25T14:41:19.274Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-F66P-93RC-M283

CVE-2026-97576 (GCVE-0-2026-97576)

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