{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-31766",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-03-09T15:48:24.140Z",
        "datePublished": "2026-05-01T14:14:56.622Z",
        "dateUpdated": "2026-08-05T12:25:00.359Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:25:00.359Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: validate doorbell_offset in user queue creation\n\namdgpu_userq_get_doorbell_index() passes the user-provided\ndoorbell_offset to amdgpu_doorbell_index_on_bar() without bounds\nchecking. An arbitrarily large doorbell_offset can cause the\ncalculated doorbell index to fall outside the allocated doorbell BO,\npotentially corrupting kernel doorbell space.\n\nValidate that doorbell_offset falls within the doorbell BO before\ncomputing the BAR index, using u64 arithmetic to prevent overflow.\n\n(cherry picked from commit de1ef4ffd70e1d15f0bf584fd22b1f28cbd5e2ec)"
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
                        "baseScore": 7.1,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - The vulnerable path is reached through the local AMDGPU DRM USERQ ioctl on a render-capable device, not through network or physical input.\nAC:L - The attacker directly controls the doorbell GEM handle and doorbell_offset in queue creation; no race or external timing condition is required.\nPR:L - A local unprivileged process with access to the AMDGPU render node can create normal user queues; the optional high-priority path is not required.\nUI:N - Exploitation is performed by the attacking process issuing ioctls and does not require another user to take action.\nS:U - The impact remains within the local kernel/GPU driver security authority and does not by itself cross a VM, IOMMU, or sandbox boundary.\nC:N - The unchecked value corrupts or aliases doorbell MMIO selector state; I found no direct path that exposes kernel memory or sensitive data.\nI:H - The attacker can cause a user queue to use a doorbell index outside its allocated doorbell BO, potentially corrupting kernel-controlled doorbell space and queue state.\nA:H - Misprogrammed or corrupted doorbells can wedge queues, trigger GPU reset paths, or destabilize the driver, causing high availability impact."
                        }
                    ]
                }
            ],
            "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/amdgpu_userq.c"
                    ],
                    "versions": [
                        {
                            "version": "f09c1e6077abd1bc2ddd2b97e1135215801ca7f9",
                            "lessThan": "3543005a42d7e8e12b21897ef6798541bf7cbcd3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f09c1e6077abd1bc2ddd2b97e1135215801ca7f9",
                            "lessThan": "86b732fbc37ce4fb76cdd4af0fb7e30a6acdbce6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f09c1e6077abd1bc2ddd2b97e1135215801ca7f9",
                            "lessThan": "a018d1819f158991b7308e4f74609c6c029b670c",
                            "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/amdgpu_userq.c"
                    ],
                    "versions": [
                        {
                            "version": "6.16",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.16",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.22",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.12",
                            "lessThanOrEqual": "6.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0",
                            "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": "6.16",
                                    "versionEndExcluding": "6.18.22"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "6.19.12"
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "7.0"
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            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/3543005a42d7e8e12b21897ef6798541bf7cbcd3"
                },
                {
                    "url": "https://git.kernel.org/stable/c/86b732fbc37ce4fb76cdd4af0fb7e30a6acdbce6"
                },
                {
                    "url": "https://git.kernel.org/stable/c/a018d1819f158991b7308e4f74609c6c029b670c"
                }
            ],
            "title": "drm/amdgpu: validate doorbell_offset in user queue creation",
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}