CVE-2026-63854 (GCVE-0-2026-63854)
Vulnerability from cvelistv5
Published
2026-07-19 14:04
Modified
2026-08-05 12:36
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: drm/amdgpu/vcn: set no_user_fence for VCN v3.0 enc/dec rings VCN encoder and decoder rings do not support 64-bit user fence writes, reject CS submissions with user fences. (cherry picked from commit 663bed3c7b8b9a7624b0d95d300ddae034ad0614)
References
Impacted products
Vendor Product Version
Linux Linux Version: cf14826cdfb5c9fe10f98210d040b9d7486c381d
Version: cf14826cdfb5c9fe10f98210d040b9d7486c381d
Version: cf14826cdfb5c9fe10f98210d040b9d7486c381d
Version: cf14826cdfb5c9fe10f98210d040b9d7486c381d
Version: cf14826cdfb5c9fe10f98210d040b9d7486c381d
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e74fc9c72c1ba78d0de0b849f5929c3b39a8e20c",
              "status": "affected",
              "version": "cf14826cdfb5c9fe10f98210d040b9d7486c381d",
              "versionType": "git"
            },
            {
              "lessThan": "26c4f38529ac78930c9c4713e16ebc5b689bb0a3",
              "status": "affected",
              "version": "cf14826cdfb5c9fe10f98210d040b9d7486c381d",
              "versionType": "git"
            },
            {
              "lessThan": "2d6525e7b2504f5bbfe9417cddc1e8da858791dd",
              "status": "affected",
              "version": "cf14826cdfb5c9fe10f98210d040b9d7486c381d",
              "versionType": "git"
            },
            {
              "lessThan": "b076e45e6f757a2829e80d0144c1b5f201bee5af",
              "status": "affected",
              "version": "cf14826cdfb5c9fe10f98210d040b9d7486c381d",
              "versionType": "git"
            },
            {
              "lessThan": "f1e5a6660d7cbf006079126d9babbf0ccf538c6b",
              "status": "affected",
              "version": "cf14826cdfb5c9fe10f98210d040b9d7486c381d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.9"
            },
            {
              "lessThan": "5.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.141",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.141",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.91",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.33",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.10",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vcn: set no_user_fence for VCN v3.0 enc/dec rings\n\nVCN encoder and decoder rings do not support 64-bit user fence writes,\nreject CS submissions with user fences.\n\n(cherry picked from commit 663bed3c7b8b9a7624b0d95d300ddae034ad0614)"
        }
      ],
      "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 - Exploitation requires issuing DRM_IOCTL_AMDGPU_CS on a local AMDGPU render node (/dev/dri/renderD*); this is a local ioctl path, not a network-reachable interface.\nAC:L - An attacker with render-node access can reliably submit a command stream with AMDGPU_CHUNK_ID_FENCE targeting VCN v3.0 encoder/decoder rings without races or uncontrollable system state.\nPR:L - The vulnerable amdgpu_cs_ioctl path requires only authenticated render-node access (DRM_AUTH|DRM_RENDER_ALLOW), which is available to unprivileged local users on typical Linux systems with AMDGPU hardware.\nUI:N - No victim interaction is required; the attacker directly submits the malformed GPU command stream via ioctl from their own process.\nS:U - The vulnerability operates within the attacker\u0027s own AMDGPU/GPU context and does not cross a demonstrated security boundary such as VM escape or IOMMU bypass.\nC:H - Allowing unsupported 64-bit user fence submissions on VCN rings causes GPU-initiated memory writes with incorrect semantics; this class of GPU memory corruption can be leveraged for information disclosure.\nI:H - The bug permits GPU DMA writes to attacker-influenced virtual addresses through malformed user-fence handling, constituting a memory corruption primitive that could enable further exploitation.\nA:H - Malformed fence operations on VCN rings can hang the video engine or trigger GPU reset, causing denial of service affecting graphics and compute availability on the system."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:36:32.766Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e74fc9c72c1ba78d0de0b849f5929c3b39a8e20c"
        },
        {
          "url": "https://git.kernel.org/stable/c/26c4f38529ac78930c9c4713e16ebc5b689bb0a3"
        },
        {
          "url": "https://git.kernel.org/stable/c/2d6525e7b2504f5bbfe9417cddc1e8da858791dd"
        },
        {
          "url": "https://git.kernel.org/stable/c/b076e45e6f757a2829e80d0144c1b5f201bee5af"
        },
        {
          "url": "https://git.kernel.org/stable/c/f1e5a6660d7cbf006079126d9babbf0ccf538c6b"
        }
      ],
      "title": "drm/amdgpu/vcn: set no_user_fence for VCN v3.0 enc/dec rings",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63854",
    "datePublished": "2026-07-19T14:04:44.487Z",
    "dateReserved": "2026-07-19T07:54:57.016Z",
    "dateUpdated": "2026-08-05T12:36:32.766Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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