{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63846","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T07:54:57.016Z","datePublished":"2026-07-19T14:04:39.674Z","dateUpdated":"2026-08-05T12:36:24.131Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:36:24.131Z"},"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)"}],"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 workloads."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/jpeg_v3_0.c"],"versions":[{"version":"dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3","lessThan":"ee035a9d3eed3a9f5a3e83c31a10b321c9598861","status":"affected","versionType":"git"},{"version":"dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3","lessThan":"303da8279f195cc741adc52c1b44d6b64de63bb0","status":"affected","versionType":"git"},{"version":"dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3","lessThan":"5ada37d7f736f9feeaa06a25e470a4c74e67a61a","status":"affected","versionType":"git"},{"version":"dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3","lessThan":"48ce00787e3fddd2b45692fc991b8ab128343da5","status":"affected","versionType":"git"},{"version":"dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3","lessThan":"a2baf12eec41f246689e6a3f8619af1200031576","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/jpeg_v3_0.c"],"versions":[{"version":"5.9","status":"affected"},{"version":"0","lessThan":"5.9","status":"unaffected","versionType":"semver"},{"version":"6.6.141","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.91","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.33","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.10","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.6.141"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.12.91"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.18.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"7.0.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"7.1"}]}]}],"references":[{"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"}],"title":"drm/amdgpu/jpeg: set no_user_fence for JPEG v3.0 ring","x_generator":{"engine":"bippy-1.2.0"}}}}