CVE-2026-97579 (GCVE-0-2026-97579)
Vulnerability from cvelistv5
Published
2026-09-25 10:22
Modified
2026-10-19 09:09
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: media: mediatek: vcodec: bound AV1 tile-start copy to the array capacity vdec_av1_slice_setup_tile() copies tile_cols + 1 / tile_rows + 1 entries into mi_col_starts[] / mi_row_starts[] from the bitstream tile_info. Bound the copy to the array capacity.
References
Impacted products
Vendor Product Version
Linux Linux Version: 0934d37596151edce115c6d0843a9ad7d5e5d232
Version: 0934d37596151edce115c6d0843a9ad7d5e5d232
Version: 0934d37596151edce115c6d0843a9ad7d5e5d232
Version: 0934d37596151edce115c6d0843a9ad7d5e5d232
Version: 0934d37596151edce115c6d0843a9ad7d5e5d232
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_av1_req_lat_if.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f19acf00818a9eada06a77715d0188c181fb435e",
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              "version": "0934d37596151edce115c6d0843a9ad7d5e5d232",
              "versionType": "git"
            },
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              "status": "affected",
              "version": "0934d37596151edce115c6d0843a9ad7d5e5d232",
              "versionType": "git"
            },
            {
              "lessThan": "7992059c045780095ba5a696dcb2f5400a82803c",
              "status": "affected",
              "version": "0934d37596151edce115c6d0843a9ad7d5e5d232",
              "versionType": "git"
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            {
              "lessThan": "eb0ea3898e3921900939e30c3946dd2b52281859",
              "status": "affected",
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              "version": "0934d37596151edce115c6d0843a9ad7d5e5d232",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_av1_req_lat_if.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "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",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.7",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: mediatek: vcodec: bound AV1 tile-start copy to the array capacity\n\nvdec_av1_slice_setup_tile() copies tile_cols + 1 / tile_rows + 1 entries\ninto mi_col_starts[] / mi_row_starts[] from the bitstream tile_info. Bound\nthe copy to the array capacity."
        }
      ],
      "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 bad tile_info.tile_cols/tile_rows reach vdec_av1_slice_setup_tile() from a local process that sets V4L2_CID_STATELESS_AV1_FRAME via VIDIOC_S_EXT_CTRLS on the mtk-vcodec decoder /dev/videoN and queues a request. A spec-conforming AV1 parser caps tile counts at 64, so a remote bitstream does not produce the malformed values.\nAC:L - The attacker sets tile_cols or tile_rows to any value from 65 to 255. validate_av1_frame() never checks them, and the driver\u0027s num_tiles check in vdec_av1_slice_setup_tile_group() runs after vdec_av1_slice_setup_pfc() has already done the copy, so the overflow happens on every such request.\nPR:L - It needs only the ability to open the decoder video node, which is normally granted to the video group or to media/GPU processes. No capability check lies on the ioctl or request-queue path to vdec_av1_slice_lat_decode().\nUI:N - The attacker supplies the control payload and queues the request themselves. No other user has to do anything.\nS:U - This is a heap overflow in kernel memory. It gives kernel-level impact within the same security authority, not a VM or IOMMU boundary crossing.\nC:H - Writing up to 764 bytes past mi_row_starts[] runs off the end of the kzalloc\u0027d vdec_av1_slice_pfc into the neighbouring slab object. That corruption can be used to build read primitives and leak kernel memory.\nI:H - The written values are ALIGN(ctrl_tile-\u003emi_*_starts[i]) \u003e\u003e mib_size_log2, taken from the attacker\u0027s own control payload. This gives an attacker-shaped heap out-of-bounds write that can corrupt neighbouring objects.\nA:H - Corrupting the pfc fields past the tile arrays (frame, state, ref_idx) and the neighbouring slab object can oops the kernel or hang the decoder, and any local user with device access can repeat it."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:09:41.776Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f19acf00818a9eada06a77715d0188c181fb435e"
        },
        {
          "url": "https://git.kernel.org/stable/c/ad47a250afafa3a51cfb4a004463ff28e66c596e"
        },
        {
          "url": "https://git.kernel.org/stable/c/7992059c045780095ba5a696dcb2f5400a82803c"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb0ea3898e3921900939e30c3946dd2b52281859"
        },
        {
          "url": "https://git.kernel.org/stable/c/37bef2170d4c88fc3d708eecf3ef0f4032bc1372"
        }
      ],
      "title": "media: mediatek: vcodec: bound AV1 tile-start copy to the array capacity",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97579",
    "datePublished": "2026-09-25T10:22:01.216Z",
    "dateReserved": "2026-09-24T16:01:01.156Z",
    "dateUpdated": "2026-10-19T09:09:41.776Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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