CVE-2026-63846

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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": "34d72bb699305992d3190220e331a95bfd3e9f7f", "status": "affected", "versionType": "git"}, {"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": "6.1.191", "lessThanOrEqual": "6.1.*", "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": "6.1.191"}, {"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/34d72bb699305992d3190220e331a95bfd3e9f7f"}, {"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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-63846", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:31:56.865035Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-20", "description": "CWE-20 Improper Input Validation"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:07:50.664Z"}}]}}

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{"bugzilla": {"description": "kernel: drm/amdgpu/jpeg: set no_user_fence for JPEG v3.0 ring", "id": "2502290", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502290"}, "csaw": false, "cwe": "CWE-1287", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/amdgpu/jpeg: set no_user_fence for JPEG v3.0 ring\nJPEG rings do not support 64-bit user fence writes, reject CS\nsubmissions with user fences.\n(cherry picked from commit 4d7d774f100efb5089c86a1fb8c5bf47c63fc9ef)", "A flaw was found in the Linux kernel's `drm/amdgpu/jpeg` component, specifically within the JPEG v3.0 ring. This component does not support 64-bit user fence writes. Consequently, any command submissions (CS) that attempt to use 64-bit user fences will be rejected, leading to a functional limitation or denial of service for applications relying on this feature."], "name": "CVE-2026-63846", "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-2026-63846\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63846\nhttps://lore.kernel.org/linux-cve-announce/2026071930-CVE-2026-63846-079b@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3,ee035a9d3eed3a9f5a3e83c31a10b321c9598861)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3,303da8279f195cc741adc52c1b44d6b64de63bb0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3,5ada37d7f736f9feeaa06a25e470a4c74e67a61a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3,48ce00787e3fddd2b45692fc991b8ab128343da5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3,a2baf12eec41f246689e6a3f8619af1200031576)"}}], "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": "semver", "value": "5.9"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.9)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.141,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.91,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.33,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.10,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "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": "2026-07-21T04:00:04.119102+00:00", "updated": "2026-10-23T08:45:16.394785+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}