{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-63843",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T07:54:57.015Z",
        "datePublished": "2026-07-19T14:04:37.815Z",
        "dateUpdated": "2026-08-05T12:36:20.909Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:36:20.909Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/jpeg: set no_user_fence for JPEG v4.0.5 ring\n\nJPEG rings do not support 64-bit user fence writes, reject CS\nsubmissions with user fences.\n\n(cherry picked from commit f05d0a4f21fc720116d6e238f23308b199891058)"
                }
            ],
            "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 submitting DRM_IOCTL_AMDGPU_CS on a local /dev/dri/renderD* device node; the vulnerable JPEG ring path is only reachable through this local ioctl interface, not over the network.\nAC:L - An attacker with render-node access can reliably craft an AMDGPU_CS submission with a FENCE chunk targeting the JPEG ring (ip_type=AMDGPU_HW_IP_VCN_JPEG) on VCN 4.0.5 hardware without races or conditions outside their control.\nPR:L - DRM_IOCTL_AMDGPU_CS is gated by DRM_AUTH|DRM_RENDER_ALLOW, requiring only unprivileged local access to a render node (typical for users in the render/video group, browser GPU processes, or cloud GPU tenants), not root in the init namespace.\nUI:N - No victim interaction is required once the attacker has render-node access; exploitation is achieved entirely through crafted ioctl submissions.\nS:U - Impact is confined to the kernel/GPU driver security domain of the compromised context; this is a standard local GPU driver memory-corruption issue, not a VM escape or cross-security-authority boundary bypass.\nC:H - The unsupported 64-bit user fence path causes the JPEG engine to perform a GPU-initiated memory write to attacker-chosen GPU virtual addresses, providing a memory-corruption primitive that can be leveraged for arbitrary kernel memory disclosure in exploit chains.\nI:H - The malformed fence write is a GPU-driven arbitrary memory write to attacker-controlled GPU VA mappings (including GTT-backed system memory), constituting a memory corruption primitive exploitable for code execution or privilege escalation.\nA:H - Triggering unsupported fence operations on the JPEG engine can cause GPU hangs, engine resets, or kernel warnings/oops, resulting in denial of service affecting system availability."
                        }
                    ]
                }
            ],
            "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_5.c"
                    ],
                    "versions": [
                        {
                            "version": "8f98a715da8e906cff5c635f9eb5399b84751557",
                            "lessThan": "424510b60d4698a75a6ff71acdd88b528f0f39af",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8f98a715da8e906cff5c635f9eb5399b84751557",
                            "lessThan": "f26e3f7186cd6ecc93e6af102744d64c798dea7e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8f98a715da8e906cff5c635f9eb5399b84751557",
                            "lessThan": "f9bc5633b761cff200c428f61ed0df6212b1c721",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8f98a715da8e906cff5c635f9eb5399b84751557",
                            "lessThan": "b65b7f3f3c18f797f81a2af7c97e2079900ad6db",
                            "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_5.c"
                    ],
                    "versions": [
                        {
                            "version": "6.7",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.7",
                            "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": "6.7",
                                    "versionEndExcluding": "6.12.91"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.7",
                                    "versionEndExcluding": "6.18.33"
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                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.7",
                                    "versionEndExcluding": "7.0.10"
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                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.7",
                                    "versionEndExcluding": "7.1"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/424510b60d4698a75a6ff71acdd88b528f0f39af"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f26e3f7186cd6ecc93e6af102744d64c798dea7e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f9bc5633b761cff200c428f61ed0df6212b1c721"
                },
                {
                    "url": "https://git.kernel.org/stable/c/b65b7f3f3c18f797f81a2af7c97e2079900ad6db"
                }
            ],
            "title": "drm/amdgpu/jpeg: set no_user_fence for JPEG v4.0.5 ring",
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