{ "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" } } } }