{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-63842",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T07:54:57.015Z",
        "datePublished": "2026-07-19T14:04:37.212Z",
        "dateUpdated": "2026-08-05T12:36:19.801Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:36:19.801Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/jpeg: set no_user_fence for JPEG v5.0.0 ring\n\nJPEG rings do not support 64-bit user fence writes, reject CS\nsubmissions with user fences.\n\n(cherry picked from commit 0f43893d3cd478fa57836697525b338817c9c23d)"
                }
            ],
            "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 AMDGPU command buffers via DRM_IOCTL_AMDGPU_CS on a local /dev/dri/renderD* device; the JPEG ring is not reachable over the network.\nAC:L - An attacker with render-node access can deterministically submit a CS with an AMDGPU_CHUNK_ID_FENCE chunk and a JPEG-ring IB (AMDGPU_HW_IP_VCN_JPEG); no race or external timing is required.\nPR:L - The amdgpu_cs_ioctl path is gated by DRM_AUTH|DRM_RENDER_ALLOW, reachable by unprivileged local users with standard render-node access (render group membership), not root.\nUI:N - No victim interaction is required; the attacker triggers the malformed user-fence write through their own ioctl submission.\nS:U - Impact is confined to GPU memory writes within the attacker's amdgpu VM context; this is standard local privilege/resource abuse, not a VM escape or cross-authority boundary crossing.\nC:H - The JPEG engine performs an unsupported 64-bit fence memory write (via jpeg_v4_0_3_dec_ring_emit_fence with AMDGPU_FENCE_FLAG_64BIT), causing GPU memory corruption that can be leveraged for arbitrary read primitives within the attacker's GPU address space.\nI:H - The malformed hardware fence write can corrupt arbitrary GPU-mapped buffers in the submitter's VM, providing a write primitive that could be developed into GPU code execution or further kernel compromise.\nA:H - Incorrect fence handling can hang or reset the GPU (affecting all users of the device) and may trigger kernel GPU driver recovery paths, causing denial of service."
                        }
                    ]
                }
            ],
            "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_v5_0_0.c"
                    ],
                    "versions": [
                        {
                            "version": "dfad65c65728401587142577dd283476491bac83",
                            "lessThan": "3a55ff19a6ff5e046d6a4a18e36deec5d95d9a2e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dfad65c65728401587142577dd283476491bac83",
                            "lessThan": "a7e63bb93a7fde3c8920984c3deee9acfe461562",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dfad65c65728401587142577dd283476491bac83",
                            "lessThan": "69ab75c7c5f378eb46f4c918aa848bb5c5603924",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dfad65c65728401587142577dd283476491bac83",
                            "lessThan": "ea7c61c5f895e8f9ea0ffffa180498ef9c740152",
                            "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_v5_0_0.c"
                    ],
                    "versions": [
                        {
                            "version": "6.9",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.9",
                            "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": "6.9",
                                    "versionEndExcluding": "6.12.91"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.9",
                                    "versionEndExcluding": "6.18.33"
                                },
                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.9",
                                    "versionEndExcluding": "7.0.10"
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.9",
                                    "versionEndExcluding": "7.1"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/3a55ff19a6ff5e046d6a4a18e36deec5d95d9a2e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/a7e63bb93a7fde3c8920984c3deee9acfe461562"
                },
                {
                    "url": "https://git.kernel.org/stable/c/69ab75c7c5f378eb46f4c918aa848bb5c5603924"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ea7c61c5f895e8f9ea0ffffa180498ef9c740152"
                }
            ],
            "title": "drm/amdgpu/jpeg: set no_user_fence for JPEG v5.0.0 ring",
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