{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-63845", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.016Z", "datePublished": "2026-07-19T14:04:39.084Z", "dateUpdated": "2026-08-05T12:36:23.065Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:36:23.065Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/jpeg: set no_user_fence for JPEG v4.0 ring\n\nJPEG rings do not support 64-bit user fence writes, reject CS\nsubmissions with user fences.\n\n(cherry picked from commit 8d0cac9478a3f046279c657d6a2545de49ae675a)" } ], "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 a local DRM render-node client to issue DRM_IOCTL_AMDGPU_CS; the vulnerable path runs when amdgpu_cs_ioctl accepts a command submission with an AMDGPU_CHUNK_ID_FENCE user fence targeting the JPEG v4.0 decode ring (AMDGPU_HW_IP_VCN_JPEG).\nAC:L - An attacker with render-node access can deterministically submit a JPEG-ring CS with a user-fence chunk; no race or victim-dependent timing is required beyond having an affected VCN 4.0.0/4.0.2/4.0.4 AMD GPU (RDNA3-class hardware).\nPR:L - Only a local unprivileged user able to open /dev/dri/renderD* and submit CS jobs is needed; amdgpu_cs_ioctl is exposed to render clients (DRM_RENDER_ALLOW) without requiring root or DRM master privileges.\nUI:N - No victim interaction is required; the attacker directly crafts and submits the malicious ioctl from their own GPU client process.\nS:U - The corrupted GPU fence write is performed through the submitting context's GPU VM and does not cross a VM/host or IOMMU security boundary; impact remains within the attacker's kernel/GPU security scope (local privilege escalation scenario).\nC:H - amdgpu_ib.c always emits user fences with AMDGPU_FENCE_FLAG_64BIT, but jpeg_v2_0_dec_ring_emit_fence (used by JPEG v4.0) only supports 32-bit writes and WARN_ONs the 64-bit flag, causing the hardware to perform an unsupported GPU memory write that can corrupt memory and be leveraged for information disclosure.\nI:H - The unsupported fence path issues a GPU MEM_WR to an attacker-chosen GPU virtual address, providing a memory-corruption primitive that can be developed into arbitrary writes and potential kernel code execution.\nA:H - Submitting an unsupported 64-bit user fence to the JPEG ring can hang or reset the GPU and destabilize the amdgpu driver, causing denial of service to GPU workloads and potential system-wide availability impact." } ] } ], "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_v4_0.c" ], "versions": [ { "version": "b13111de32a9202c6d58bb7e4c06296b99c4d7e3", "lessThan": "d4e0172a1b614373385e9b7111b580f8d2e0b98f", "status": "affected", "versionType": "git" }, { "version": "b13111de32a9202c6d58bb7e4c06296b99c4d7e3", "lessThan": "a676f16ea9a7df96d69f405afb6eb349571b3382", "status": "affected", "versionType": "git" }, { "version": "b13111de32a9202c6d58bb7e4c06296b99c4d7e3", "lessThan": "6876d05b899102f4dfdb9ad560132126144c1c72", "status": "affected", "versionType": "git" }, { "version": "b13111de32a9202c6d58bb7e4c06296b99c4d7e3", "lessThan": "af4b458daa597dae707bf3f1f74745f5fc133ca2", "status": "affected", "versionType": "git" }, { "version": "b13111de32a9202c6d58bb7e4c06296b99c4d7e3", "lessThan": "e7e90b5839aeb8805ec83bb4da610b8dab8e184d", "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_v4_0.c" ], "versions": [ { "version": "5.19", "status": "affected" }, { "version": "0", "lessThan": "5.19", "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": "5.19", "versionEndExcluding": "6.6.141" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.12.91" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.18.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.0.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d4e0172a1b614373385e9b7111b580f8d2e0b98f" }, { "url": "https://git.kernel.org/stable/c/a676f16ea9a7df96d69f405afb6eb349571b3382" }, { "url": "https://git.kernel.org/stable/c/6876d05b899102f4dfdb9ad560132126144c1c72" }, { "url": "https://git.kernel.org/stable/c/af4b458daa597dae707bf3f1f74745f5fc133ca2" }, { "url": "https://git.kernel.org/stable/c/e7e90b5839aeb8805ec83bb4da610b8dab8e184d" } ], "title": "drm/amdgpu/jpeg: set no_user_fence for JPEG v4.0 ring", "x_generator": { "engine": "bippy-1.2.0" } } } }