CVE-2026-63853

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AMDGPU/VCN driver and GPU resources of the submitting security context; it does not cross a VM, container, or IOMMU security boundary to affect a different authority.\nC:H - Without the no_user_fence guard, amdgpu_ib_commit emits a 64-bit user fence (AMDGPU_FENCE_FLAG_64BIT) on a ring whose emit_fence path only supports 32-bit fence writes, causing the VCN hardware to perform an unvalidated GPU DMA write that can corrupt adjacent GPU-mapped memory and be leveraged for information disclosure.\nI:H - The same rogue GPU-initiated fence write is a memory-corruption primitive that can modify GPU-accessible buffers (including shared dma-buf mappings) outside the intended 8-byte fence field, enabling integrity violations and potential further exploitation.\nA:H - Malformed fence/trap commands on the VCN unified encoder ring can hang or fault the VCN block and force GPU/driver reset, denying graphics and compute availability to all users of the device on shared workstations and servers."}]}], 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"privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-63853", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:32:17.901838Z", "version": "2.0.3"}}]}, "published": "2026-07-19T15:16:52.113", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1286b6872de0aee1feeeaa6dbac86369806de9a5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/51f694221047c84fa185be98210eb2c354ffb8c6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": 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{"bugzilla": {"description": "kernel: drm/amdgpu/vcn: set no_user_fence for VCN v4.0 enc ring", "id": "2502293", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502293"}, "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/vcn: set no_user_fence for VCN v4.0 enc ring\nVCN encoder and decoder rings do not support 64-bit user fence writes,\nreject CS submissions with user fences.\n(cherry picked from commit fd852c048b46f9825e904a4f3f4538fe9d8827d9)", "A flaw was found in the Linux kernel's AMD GPU Video Core Next (VCN) driver. This vulnerability arises because the VCN encoder and decoder rings, responsible for video processing, do not support 64-bit user fence writes. An attacker could exploit this by submitting command requests that include these unsupported user fences. This would result in the system rejecting the submissions, potentially leading to a denial of service for specific video processing functionalities."], "name": "CVE-2026-63853", "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-2026-63853\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63853\nhttps://lore.kernel.org/linux-cve-announce/2026071932-CVE-2026-63853-ad90@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8da1170a16e4d4b49fa07d1f75ad480847ff7eca,1286b6872de0aee1feeeaa6dbac86369806de9a5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8da1170a16e4d4b49fa07d1f75ad480847ff7eca,6bdd2ed6458d35c368fbe9550a4d7f342abd3a92)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8da1170a16e4d4b49fa07d1f75ad480847ff7eca,51f694221047c84fa185be98210eb2c354ffb8c6)"}}], "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": "semver", "value": "[6.18.33,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "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": "2026-07-21T04:00:04.118570+00:00", "updated": "2026-10-27T01:45:13.968190+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}