CVE-2026-63845

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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": 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{"bugzilla": {"description": "kernel: drm/amdgpu/jpeg: set no_user_fence for JPEG v4.0 ring", "id": "2502292", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502292"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1287", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/amdgpu/jpeg: set no_user_fence for JPEG v4.0 ring\nJPEG rings do not support 64-bit user fence writes, reject CS\nsubmissions with user fences.\n(cherry picked from commit 8d0cac9478a3f046279c657d6a2545de49ae675a)", "A flaw was found in the Linux kernel, specifically within the AMD GPU's JPEG (Joint Photographic Experts Group) ring component. This vulnerability occurs because the JPEG v4.0 rings do not support 64-bit user fence writes. This can lead to the system rejecting command submissions that utilize user fences, potentially causing a denial of service for applications relying on this functionality."], "name": "CVE-2026-63845", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63845\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63845\nhttps://lore.kernel.org/linux-cve-announce/2026071930-CVE-2026-63845-59b7@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b13111de32a9202c6d58bb7e4c06296b99c4d7e3,d4e0172a1b614373385e9b7111b580f8d2e0b98f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b13111de32a9202c6d58bb7e4c06296b99c4d7e3,a676f16ea9a7df96d69f405afb6eb349571b3382)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b13111de32a9202c6d58bb7e4c06296b99c4d7e3,6876d05b899102f4dfdb9ad560132126144c1c72)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b13111de32a9202c6d58bb7e4c06296b99c4d7e3,af4b458daa597dae707bf3f1f74745f5fc133ca2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b13111de32a9202c6d58bb7e4c06296b99c4d7e3,e7e90b5839aeb8805ec83bb4da610b8dab8e184d)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.141,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.91,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.33,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0.10,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-21T02:30:17.331051+00:00", "updated": "2026-10-23T07:30:09.356408+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}