{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63842","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T07:54:57.015Z","datePublished":"2026-07-19T14:04:37.212Z","dateUpdated":"2026-08-05T12:36:19.801Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:36:19.801Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/jpeg: set no_user_fence for JPEG v5.0.0 ring\n\nJPEG rings do not support 64-bit user fence writes, reject CS\nsubmissions with user fences.\n\n(cherry picked from commit 0f43893d3cd478fa57836697525b338817c9c23d)"}],"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 - Exploitation requires submitting AMDGPU command buffers via DRM_IOCTL_AMDGPU_CS on a local /dev/dri/renderD* device; the JPEG ring is not reachable over the network.\nAC:L - An attacker with render-node access can deterministically submit a CS with an AMDGPU_CHUNK_ID_FENCE chunk and a JPEG-ring IB (AMDGPU_HW_IP_VCN_JPEG); no race or external timing is required.\nPR:L - The amdgpu_cs_ioctl path is gated by DRM_AUTH|DRM_RENDER_ALLOW, reachable by unprivileged local users with standard render-node access (render group membership), not root.\nUI:N - No victim interaction is required; the attacker triggers the malformed user-fence write through their own ioctl submission.\nS:U - Impact is confined to GPU memory writes within the attacker's amdgpu VM context; this is standard local privilege/resource abuse, not a VM escape or cross-authority boundary crossing.\nC:H - The JPEG engine performs an unsupported 64-bit fence memory write (via jpeg_v4_0_3_dec_ring_emit_fence with AMDGPU_FENCE_FLAG_64BIT), causing GPU memory corruption that can be leveraged for arbitrary read primitives within the attacker's GPU address space.\nI:H - The malformed hardware fence write can corrupt arbitrary GPU-mapped buffers in the submitter's VM, providing a write primitive that could be developed into GPU code execution or further kernel compromise.\nA:H - Incorrect fence handling can hang or reset the GPU (affecting all users of the device) and may trigger kernel GPU driver recovery paths, causing denial of service."}]}],"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_v5_0_0.c"],"versions":[{"version":"dfad65c65728401587142577dd283476491bac83","lessThan":"3a55ff19a6ff5e046d6a4a18e36deec5d95d9a2e","status":"affected","versionType":"git"},{"version":"dfad65c65728401587142577dd283476491bac83","lessThan":"a7e63bb93a7fde3c8920984c3deee9acfe461562","status":"affected","versionType":"git"},{"version":"dfad65c65728401587142577dd283476491bac83","lessThan":"69ab75c7c5f378eb46f4c918aa848bb5c5603924","status":"affected","versionType":"git"},{"version":"dfad65c65728401587142577dd283476491bac83","lessThan":"ea7c61c5f895e8f9ea0ffffa180498ef9c740152","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_v5_0_0.c"],"versions":[{"version":"6.9","status":"affected"},{"version":"0","lessThan":"6.9","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":"6.9","versionEndExcluding":"6.12.91"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.18.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.0.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/3a55ff19a6ff5e046d6a4a18e36deec5d95d9a2e"},{"url":"https://git.kernel.org/stable/c/a7e63bb93a7fde3c8920984c3deee9acfe461562"},{"url":"https://git.kernel.org/stable/c/69ab75c7c5f378eb46f4c918aa848bb5c5603924"},{"url":"https://git.kernel.org/stable/c/ea7c61c5f895e8f9ea0ffffa180498ef9c740152"}],"title":"drm/amdgpu/jpeg: set no_user_fence for JPEG v5.0.0 ring","x_generator":{"engine":"bippy-1.2.0"}}}}