{"id":"CVE-2026-63851","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:\n\ndrm/amdgpu/vcn: set no_user_fence for VCN v4.0.5 enc ring\n\nVCN encoder and decoder rings do not support 64-bit user fence writes,\nreject CS submissions with user fences…","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 >= 547aad32edac17a3ec4989d8aad2426d0cbeb590 < 75091030f07b7957cc0646cd52e2d9d15f611483","Linux >= 547aad32edac17a3ec4989d8aad2426d0cbeb590 < 6d9a98c5ed65ba92a09e4ca5a5f6941448145529","Linux >= 547aad32edac17a3ec4989d8aad2426d0cbeb590 < 7f23b5c420b9f68a210c29c5123bace670aa8cc9","Linux >= 547aad32edac17a3ec4989d8aad2426d0cbeb590 < 589a254bf3e88204c8402b9cbccd5e23a0af990f","Linux 6.7"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:32:12.926924Z"},"published":"2026-07-19","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:42:07.558Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63851","references":[{"url":"https://git.kernel.org/stable/c/75091030f07b7957cc0646cd52e2d9d15f611483"},{"url":"https://git.kernel.org/stable/c/6d9a98c5ed65ba92a09e4ca5a5f6941448145529"},{"url":"https://git.kernel.org/stable/c/7f23b5c420b9f68a210c29c5123bace670aa8cc9"},{"url":"https://git.kernel.org/stable/c/589a254bf3e88204c8402b9cbccd5e23a0af990f"}],"tags":["cve.org"],"epss":0.00175,"epssPercentile":0.06559,"ingestedAt":"2026-10-16T17:24:46.758Z","slug":"CVE-2026-63851","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vcn: set no_user_fence for VCN v4.0.5 enc ring\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 084d94ac93707bdda07efb5cee786f632de4219b)\n\n## Affected\n\n- `Linux >= 547aad32edac17a3ec4989d8aad2426d0cbeb590 < 75091030f07b7957cc0646cd52e2d9d15f611483`\n- `Linux >= 547aad32edac17a3ec4989d8aad2426d0cbeb590 < 6d9a98c5ed65ba92a09e4ca5a5f6941448145529`\n- `Linux >= 547aad32edac17a3ec4989d8aad2426d0cbeb590 < 7f23b5c420b9f68a210c29c5123bace670aa8cc9`\n- `Linux >= 547aad32edac17a3ec4989d8aad2426d0cbeb590 < 589a254bf3e88204c8402b9cbccd5e23a0af990f`\n- `Linux 6.7`\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":[]}