{"id":"CVE-2026-63854","state":"PUBLISHED","title":"drm/amdgpu/vcn: set no_user_fence for VCN v3.0 enc/dec rings","description":"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)","publishedAt":"2026-07-19T14:04:44.487Z","updatedAt":"2026-10-30T12:27:17.101Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cf14826cdfb5c9fe10f98210d040b9d7486c381d","status":"affected","lessThan":"e3d339b0d9051d49eb9c78459091bba4fb525100","versionType":"git"},{"version":"cf14826cdfb5c9fe10f98210d040b9d7486c381d","status":"affected","lessThan":"e74fc9c72c1ba78d0de0b849f5929c3b39a8e20c","versionType":"git"},{"version":"cf14826cdfb5c9fe10f98210d040b9d7486c381d","status":"affected","lessThan":"26c4f38529ac78930c9c4713e16ebc5b689bb0a3","versionType":"git"},{"version":"cf14826cdfb5c9fe10f98210d040b9d7486c381d","status":"affected","lessThan":"2d6525e7b2504f5bbfe9417cddc1e8da858791dd","versionType":"git"},{"version":"cf14826cdfb5c9fe10f98210d040b9d7486c381d","status":"affected","lessThan":"b076e45e6f757a2829e80d0144c1b5f201bee5af","versionType":"git"},{"version":"cf14826cdfb5c9fe10f98210d040b9d7486c381d","status":"affected","lessThan":"f1e5a6660d7cbf006079126d9babbf0ccf538c6b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.9","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.141","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.91","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c"]}],"references":["https://git.kernel.org/stable/c/e3d339b0d9051d49eb9c78459091bba4fb525100","https://git.kernel.org/stable/c/e74fc9c72c1ba78d0de0b849f5929c3b39a8e20c","https://git.kernel.org/stable/c/26c4f38529ac78930c9c4713e16ebc5b689bb0a3","https://git.kernel.org/stable/c/2d6525e7b2504f5bbfe9417cddc1e8da858791dd","https://git.kernel.org/stable/c/b076e45e6f757a2829e80d0144c1b5f201bee5af","https://git.kernel.org/stable/c/f1e5a6660d7cbf006079126d9babbf0ccf538c6b"],"weaknesses":["CWE-20"],"ingestedAt":"2026-10-30T12:46:06.359Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/63xxx/CVE-2026-63854.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63854","state":"PUBLISHED","datePublished":"2026-07-19T14:04:44.487Z","dateUpdated":"2026-10-30T12:27:17.101Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.016Z"},"containers":{"cna":{"title":"drm/amdgpu/vcn: set no_user_fence for VCN v3.0 enc/dec rings","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)"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cf14826cdfb5c9fe10f98210d040b9d7486c381d","status":"affected","lessThan":"e3d339b0d9051d49eb9c78459091bba4fb525100","versionType":"git"},{"version":"cf14826cdfb5c9fe10f98210d040b9d7486c381d","status":"affected","lessThan":"e74fc9c72c1ba78d0de0b849f5929c3b39a8e20c","versionType":"git"},{"version":"cf14826cdfb5c9fe10f98210d040b9d7486c381d","status":"affected","lessThan":"26c4f38529ac78930c9c4713e16ebc5b689bb0a3","versionType":"git"},{"version":"cf14826cdfb5c9fe10f98210d040b9d7486c381d","status":"affected","lessThan":"2d6525e7b2504f5bbfe9417cddc1e8da858791dd","versionType":"git"},{"version":"cf14826cdfb5c9fe10f98210d040b9d7486c381d","status":"affected","lessThan":"b076e45e6f757a2829e80d0144c1b5f201bee5af","versionType":"git"},{"version":"cf14826cdfb5c9fe10f98210d040b9d7486c381d","status":"affected","lessThan":"f1e5a6660d7cbf006079126d9babbf0ccf538c6b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.9","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.141","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.91","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/e3d339b0d9051d49eb9c78459091bba4fb525100"},{"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"}],"metrics":[{"cvssV3_1":{"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"},"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's 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 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ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-63854","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:32:20.319659Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-20","lang":"en","type":"CWE","description":"CWE-20 Improper Input Validation"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T20:07:51.809Z"}}]}}}