{"id":"CVE-2026-63846","state":"PUBLISHED","title":"drm/amdgpu/jpeg: set no_user_fence for JPEG v3.0 ring","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/jpeg: set no_user_fence for JPEG v3.0 ring\n\nJPEG rings do not support 64-bit user fence writes, reject CS\nsubmissions with user fences.\n\n(cherry picked from commit 4d7d774f100efb5089c86a1fb8c5bf47c63fc9ef)","publishedAt":"2026-07-19T14:04:39.674Z","updatedAt":"2026-10-30T12:27:12.843Z","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":"dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3","status":"affected","lessThan":"34d72bb699305992d3190220e331a95bfd3e9f7f","versionType":"git"},{"version":"dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3","status":"affected","lessThan":"ee035a9d3eed3a9f5a3e83c31a10b321c9598861","versionType":"git"},{"version":"dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3","status":"affected","lessThan":"303da8279f195cc741adc52c1b44d6b64de63bb0","versionType":"git"},{"version":"dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3","status":"affected","lessThan":"5ada37d7f736f9feeaa06a25e470a4c74e67a61a","versionType":"git"},{"version":"dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3","status":"affected","lessThan":"48ce00787e3fddd2b45692fc991b8ab128343da5","versionType":"git"},{"version":"dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3","status":"affected","lessThan":"a2baf12eec41f246689e6a3f8619af1200031576","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/jpeg_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/jpeg_v3_0.c"]}],"references":["https://git.kernel.org/stable/c/34d72bb699305992d3190220e331a95bfd3e9f7f","https://git.kernel.org/stable/c/ee035a9d3eed3a9f5a3e83c31a10b321c9598861","https://git.kernel.org/stable/c/303da8279f195cc741adc52c1b44d6b64de63bb0","https://git.kernel.org/stable/c/5ada37d7f736f9feeaa06a25e470a4c74e67a61a","https://git.kernel.org/stable/c/48ce00787e3fddd2b45692fc991b8ab128343da5","https://git.kernel.org/stable/c/a2baf12eec41f246689e6a3f8619af1200031576"],"weaknesses":["CWE-20"],"ingestedAt":"2026-10-30T12:46:06.359Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/63xxx/CVE-2026-63846.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63846","state":"PUBLISHED","datePublished":"2026-07-19T14:04:39.674Z","dateUpdated":"2026-10-30T12:27:12.843Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.016Z"},"containers":{"cna":{"title":"drm/amdgpu/jpeg: set no_user_fence for JPEG v3.0 ring","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/jpeg: set no_user_fence for JPEG v3.0 ring\n\nJPEG rings do not support 64-bit user fence writes, reject CS\nsubmissions with user fences.\n\n(cherry picked from commit 4d7d774f100efb5089c86a1fb8c5bf47c63fc9ef)"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3","status":"affected","lessThan":"34d72bb699305992d3190220e331a95bfd3e9f7f","versionType":"git"},{"version":"dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3","status":"affected","lessThan":"ee035a9d3eed3a9f5a3e83c31a10b321c9598861","versionType":"git"},{"version":"dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3","status":"affected","lessThan":"303da8279f195cc741adc52c1b44d6b64de63bb0","versionType":"git"},{"version":"dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3","status":"affected","lessThan":"5ada37d7f736f9feeaa06a25e470a4c74e67a61a","versionType":"git"},{"version":"dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3","status":"affected","lessThan":"48ce00787e3fddd2b45692fc991b8ab128343da5","versionType":"git"},{"version":"dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3","status":"affected","lessThan":"a2baf12eec41f246689e6a3f8619af1200031576","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/jpeg_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/jpeg_v3_0.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/34d72bb699305992d3190220e331a95bfd3e9f7f"},{"url":"https://git.kernel.org/stable/c/ee035a9d3eed3a9f5a3e83c31a10b321c9598861"},{"url":"https://git.kernel.org/stable/c/303da8279f195cc741adc52c1b44d6b64de63bb0"},{"url":"https://git.kernel.org/stable/c/5ada37d7f736f9feeaa06a25e470a4c74e67a61a"},{"url":"https://git.kernel.org/stable/c/48ce00787e3fddd2b45692fc991b8ab128343da5"},{"url":"https://git.kernel.org/stable/c/a2baf12eec41f246689e6a3f8619af1200031576"}],"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 - The vulnerable code is reached only through DRM_IOCTL_AMDGPU_CS on an AMDGPU render node (/dev/dri/renderD*), requiring a local ioctl to submit a command buffer with AMDGPU_CHUNK_ID_FENCE to the JPEG v3.0 decode ring (AMDGPU_HW_IP_VCN_JPEG).\nAC:L - On affected VCN 3.0.x hardware with JPEG v3.0 (e.g. Navi 21/Sienna_Cichlid RX 6000 series), an attacker fully controls CS submission parameters and can reliably trigger the unsupported 64-bit user fence path without races or conditions beyond attacker control.\nPR:L - DRM_IOCTL_AMDGPU_CS is gated by DRM_AUTH|DRM_RENDER_ALLOW, requiring only local access to the render node available to unprivileged users in the render group or equivalent permissions, not root or special capabilities.\nUI:N - Exploitation requires no victim interaction beyond the attacker (or their process) opening the render node and submitting crafted GPU command buffers with user fences.\nS:U - The impact is confined to the attacker's GPU security context (their process VM and GPU mappings); exploitation does not cross VM, container, or IOMMU boundaries to affect other security authorities.\nC:H - The unsupported 64-bit user fence causes the GPU to perform unintended memory writes that can corrupt adjacent GPU-accessible memory, and memory corruption primitives can be leveraged for information disclosure.\nI:H - The GPU writes a fence sequence number via GPCOM to an attacker-influenced GPU virtual address, providing a controlled write primitive that can corrupt GPU memory and potentially be chained for further exploitation.\nA:H - Malformed fence operations on unsupported hardware can hang or fault the GPU subsystem, requiring a GPU reset and denying availability of graphics/compute 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