drm/amdgpu/vcn: set no_user_fence for VCN v4.0.5 enc ring

{
  "id": "3c60d693d3ff6df78d7ce1ca9b1d9014e26fb9a634ff86da7f47b8ee98ba4acf",
  "url": "https://osv.dev/vulnerability/CVE-2026-63851",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/amdgpu/vcn: set no_user_fence for VCN v4.0.5 enc ring",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn: set no_user_fence for VCN v4.0.5 enc ring VCN encoder and decoder rings do not support 64-bit user fence writes, reject CS submissions with user fences. (cherry picked from commit 084d94ac93707bdda07efb5cee786f632de4219b)",
    "evidence": "osv:CVE-2026-63851",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.91",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.33",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-63851",
      "aliases": [
        "CVE-2026-63851"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "547aad32edac17a3ec4989d8aad2426d0cbeb590"
                },
                {
                  "fixed": "75091030f07b7957cc0646cd52e2d9d15f611483"
                },
                {
                  "fixed": "6d9a98c5ed65ba92a09e4ca5a5f6941448145529"
                },
                {
                  "fixed": "7f23b5c420b9f68a210c29c5123bace670aa8cc9"
                },
                {
                  "fixed": "589a254bf3e88204c8402b9cbccd5e23a0af990f"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63851.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.91"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.33"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63851.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.103794566Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/589a254bf3e88204c8402b9cbccd5e23a0af990f",
        "https://git.kernel.org/stable/c/6d9a98c5ed65ba92a09e4ca5a5f6941448145529",
        "https://git.kernel.org/stable/c/75091030f07b7957cc0646cd52e2d9d15f611483",
        "https://git.kernel.org/stable/c/7f23b5c420b9f68a210c29c5123bace670aa8cc9",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63851.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-63851",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63851.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-63851",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497222,
  "published_at": "2026-07-19T14:04:42.581+00:00"
}