{"id":"CVE-2026-63854","title":"drm/amdgpu/vcn: set no_user_fence for VCN v3.0 enc/dec rings","summary":"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 fen…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < e74fc9c72c1ba78d0de0b849f5929c3b39a8e20c","Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < 26c4f38529ac78930c9c4713e16ebc5b689bb0a3","Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < 2d6525e7b2504f5bbfe9417cddc1e8da858791dd","Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < b076e45e6f757a2829e80d0144c1b5f201bee5af","Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < f1e5a6660d7cbf006079126d9babbf0ccf538c6b","Linux 5.9"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:32:20.319659Z"},"published":"2026-07-19","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:42:08.010Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63854","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"}],"tags":["cve.org"],"epss":0.00175,"epssPercentile":0.06558,"ingestedAt":"2026-10-16T17:24:46.759Z","slug":"CVE-2026-63854","body":"## Overview\n\nIn 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)\n\n## Affected\n\n- `Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < e74fc9c72c1ba78d0de0b849f5929c3b39a8e20c`\n- `Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < 26c4f38529ac78930c9c4713e16ebc5b689bb0a3`\n- `Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < 2d6525e7b2504f5bbfe9417cddc1e8da858791dd`\n- `Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < b076e45e6f757a2829e80d0144c1b5f201bee5af`\n- `Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < f1e5a6660d7cbf006079126d9babbf0ccf538c6b`\n- `Linux 5.9`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}