{"id":"CVE-2026-63856","title":"drm/amdgpu/vcn: set no_user_fence for VCN v2.0 enc/dec rings","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vcn: set no_user_fence for VCN v2.0 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 >= 1b61de45dfaff00b627e47349a019658e39268b9 < f264019be80de79f84f464846451445923bffea0","Linux >= 1b61de45dfaff00b627e47349a019658e39268b9 < 5e777bc4cbe928ac0fd95e368fee1540f2ce4db2","Linux >= 1b61de45dfaff00b627e47349a019658e39268b9 < ac06ce5cac9e711281585d09d00c6efcd9b86396","Linux >= 1b61de45dfaff00b627e47349a019658e39268b9 < c71aecae98e42dcf2baf462df50b3a2cf1a93fe4","Linux >= 1b61de45dfaff00b627e47349a019658e39268b9 < 8d80b293b41fcb5e9396db93e788b0f4ebcbafb7","Linux 5.3"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:32:25.121168Z"},"published":"2026-07-19","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:42:08.298Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63856","references":[{"url":"https://git.kernel.org/stable/c/f264019be80de79f84f464846451445923bffea0"},{"url":"https://git.kernel.org/stable/c/5e777bc4cbe928ac0fd95e368fee1540f2ce4db2"},{"url":"https://git.kernel.org/stable/c/ac06ce5cac9e711281585d09d00c6efcd9b86396"},{"url":"https://git.kernel.org/stable/c/c71aecae98e42dcf2baf462df50b3a2cf1a93fe4"},{"url":"https://git.kernel.org/stable/c/8d80b293b41fcb5e9396db93e788b0f4ebcbafb7"}],"tags":["cve.org"],"epss":0.00175,"epssPercentile":0.06548,"ingestedAt":"2026-10-16T17:24:46.771Z","slug":"CVE-2026-63856","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vcn: set no_user_fence for VCN v2.0 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 e2b5499fca55f1a32960a311bbb62e35891eaf73)\n\n## Affected\n\n- `Linux >= 1b61de45dfaff00b627e47349a019658e39268b9 < f264019be80de79f84f464846451445923bffea0`\n- `Linux >= 1b61de45dfaff00b627e47349a019658e39268b9 < 5e777bc4cbe928ac0fd95e368fee1540f2ce4db2`\n- `Linux >= 1b61de45dfaff00b627e47349a019658e39268b9 < ac06ce5cac9e711281585d09d00c6efcd9b86396`\n- `Linux >= 1b61de45dfaff00b627e47349a019658e39268b9 < c71aecae98e42dcf2baf462df50b3a2cf1a93fe4`\n- `Linux >= 1b61de45dfaff00b627e47349a019658e39268b9 < 8d80b293b41fcb5e9396db93e788b0f4ebcbafb7`\n- `Linux 5.3`\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":[]}