CVE-2026-31766

{"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"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.0"}]}]}], "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", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "3543005a42d7e8e12b21897ef6798541bf7cbcd3", "status": "affected", "version": "f09c1e6077abd1bc2ddd2b97e1135215801ca7f9", "versionType": "git"}, {"lessThan": "86b732fbc37ce4fb76cdd4af0fb7e30a6acdbce6", "status": "affected", "version": "f09c1e6077abd1bc2ddd2b97e1135215801ca7f9", "versionType": "git"}, {"lessThan": "a018d1819f158991b7308e4f74609c6c029b670c", "status": "affected", "version": "f09c1e6077abd1bc2ddd2b97e1135215801ca7f9", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.16"}, {"lessThan": "6.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.22", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.12", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B376ADEA-99DD-4C34-B0B2-7362FBE63A29", "versionEndExcluding": "6.18.22", "versionStartIncluding": "6.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0A2B9540-02D5-41B4-B16A-82AF66FD4F36", "versionEndExcluding": "6.19.12", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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)"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/amdgpu: validar doorbell_offset en la creaci\u00f3n de colas de usuario\n\namdgpu_userq_get_doorbell_index() pasa el doorbell_offset proporcionado por el usuario a amdgpu_doorbell_index_on_bar() sin comprobaci\u00f3n de l\u00edmites. Un doorbell_offset arbitrariamente grande puede causar que el \u00edndice de doorbell calculado caiga fuera del BO de doorbell asignado, corrompiendo potencialmente el espacio de doorbell del kernel.\n\nValidar que doorbell_offset caiga dentro del BO de doorbell antes de calcular el \u00edndice BAR, usando aritm\u00e9tica u64 para prevenir desbordamiento.\n\n(seleccionado de la confirmaci\u00f3n de1ef4ffd70e1d15f0bf584fd22b1f28cbd5e2ec)"}], "id": "CVE-2026-31766", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-01T15:16:39.763", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3543005a42d7e8e12b21897ef6798541bf7cbcd3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/86b732fbc37ce4fb76cdd4af0fb7e30a6acdbce6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a018d1819f158991b7308e4f74609c6c029b670c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: drm/amdgpu: validate doorbell_offset in user queue creation", "id": "2464406", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464406"}, "csaw": false, "cwe": "CWE-1285", "details": ["A flaw was found in the Linux kernel's AMD GPU (amdgpu) driver. A local user could exploit this vulnerability by providing a malformed doorbell offset during user queue creation. This lack of proper bounds checking allows the offset to exceed the allocated memory, potentially corrupting critical kernel memory. This could lead to a system crash (Denial of Service) or, in some scenarios, privilege escalation."], "name": "CVE-2026-31766", "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": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31766\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31766\nhttps://lore.kernel.org/linux-cve-announce/2026050147-CVE-2026-31766-dd6d@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f09c1e6077abd1bc2ddd2b97e1135215801ca7f9,3543005a42d7e8e12b21897ef6798541bf7cbcd3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f09c1e6077abd1bc2ddd2b97e1135215801ca7f9,86b732fbc37ce4fb76cdd4af0fb7e30a6acdbce6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f09c1e6077abd1bc2ddd2b97e1135215801ca7f9,a018d1819f158991b7308e4f74609c6c029b670c)"}}], "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": "6.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.22,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.12,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "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": "2026-05-01T19:15:23.984354+00:00", "updated": "2026-05-11T20:00:15.244141+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-1285"]}