CVE-2020-36788

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On failures, ttm_bo_init() invokes the provided\ndestructor which should de-initialize and free the memory.\n\nThus, when nouveau_bo_init() returns an error the gem object has already\nbeen released and the memory freed by nouveau_bo_del_ttm()."}], "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 - Reachable only via local DRM ioctls (NOUVEAU_GEM_NEW / related paths) on a Nouveau render or primary node; not via network packets or adjacent wireless protocols.\nAC:L - The UAF is a deterministic error-path bug: an attacker who can open the DRM device can force nouveau_bo_init()/ttm_bo_init() failure (e.g., exhausting memory with large GEM allocations) and reliably hit the double-put.\nPR:L - NOUVEAU_GEM_NEW is DRM_RENDER_ALLOW, so any unprivileged local user with access to /dev/dri/renderD* can invoke it without root or CAP_SYS_ADMIN.\nUI:N - The attacker opens the render node and issues the ioctl themselves; no separate victim action is required.\nS:U - Impact is confined to the host kernel privilege boundary (local privilege escalation / memory corruption); it does not cross VM, IOMMU, or other security authorities.\nC:H - Use-after-free of the nouveau_bo/TTM object enables heap reuse and arbitrary kernel memory reads once the freed slab is reclaimed.\nI:H - The post-free ttm_bo_put path operates on attacker-influencable freed object state (including destroy callback machinery), enabling arbitrary write / control-flow hijacking.\nA:H - The UAF/double-free reliably produces kernel oops, panic, or hang even without full exploitation."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/nouveau/nouveau_gem.c"], "versions": [{"version": "019cbd4a4feb3aa3a917d78e7110e3011bbff6d5", "lessThan": "f86e19d918a85492ad1a01fcdc0ad5ecbdac6f96", "status": "affected", "versionType": "git"}, {"version": "019cbd4a4feb3aa3a917d78e7110e3011bbff6d5", "lessThan": "548f2ff8ea5e0ce767ae3418d1ec5308990be87d", "status": "affected", "versionType": "git"}, {"version": "019cbd4a4feb3aa3a917d78e7110e3011bbff6d5", "lessThan": "bcf34aa5082ee2343574bc3f4d1c126030913e54", "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/nouveau/nouveau_gem.c"], "versions": [{"version": "5.4", "status": "affected"}, {"version": "0", "lessThan": "5.4", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.73", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.14.12", "lessThanOrEqual": "5.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15", "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": "5.4", "versionEndExcluding": "5.10.73"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "5.14.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "5.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f86e19d918a85492ad1a01fcdc0ad5ecbdac6f96"}, {"url": "https://git.kernel.org/stable/c/548f2ff8ea5e0ce767ae3418d1ec5308990be87d"}, {"url": "https://git.kernel.org/stable/c/bcf34aa5082ee2343574bc3f4d1c126030913e54"}], "title": "drm/nouveau: avoid a use-after-free when BO init fails", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2020-36788", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-05-23T19:01:06.801476Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:12:28.462Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T17:37:07.365Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/f86e19d918a85492ad1a01fcdc0ad5ecbdac6f96", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/548f2ff8ea5e0ce767ae3418d1ec5308990be87d", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/bcf34aa5082ee2343574bc3f4d1c126030913e54", "tags": ["x_transferred"]}]}]}}

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On failures, ttm_bo_init() invokes the provided\ndestructor which should de-initialize and free the memory.\n\nThus, when nouveau_bo_init() returns an error the gem object has already\nbeen released and the memory freed by nouveau_bo_del_ttm()."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.73", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.14.12", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15", "versionStartIncluding": "5.4"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:44:32.011Z"}}}, "cveMetadata": {"cveId": "CVE-2020-36788", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:44:32.011Z", "dateReserved": "2024-02-26T17:07:27.435Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-21T15:03:27.915Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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On failures, ttm_bo_init() invokes the provided\ndestructor which should de-initialize and free the memory.\n\nThus, when nouveau_bo_init() returns an error the gem object has already\nbeen released and the memory freed by nouveau_bo_del_ttm()."}, {"lang": "es", "value": " En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/nouveau: evita un use after free cuando falla BO init nouveau_bo_init() est\u00e1 respaldado por ttm_bo_init() y env\u00eda su c\u00f3digo de retorno de regreso a la persona que llama. En caso de falla, ttm_bo_init() invoca el destructor proporcionado que deber\u00eda desinicializar y liberar la memoria. Por lo tanto, cuando nouveau_bo_init() devuelve un error, el objeto gema ya ha sido liberado y la memoria ha sido liberada por nouveau_bo_del_ttm()."}], "id": "CVE-2020-36788", "lastModified": "2026-08-04T10:16:35.420", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2020-36788", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-23T19:01:06.801476Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:11.187", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/548f2ff8ea5e0ce767ae3418d1ec5308990be87d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bcf34aa5082ee2343574bc3f4d1c126030913e54"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f86e19d918a85492ad1a01fcdc0ad5ecbdac6f96"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/548f2ff8ea5e0ce767ae3418d1ec5308990be87d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bcf34aa5082ee2343574bc3f4d1c126030913e54"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f86e19d918a85492ad1a01fcdc0ad5ecbdac6f96"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: drm/nouveau: avoid a use-after-free when BO init fails", "id": "2282961", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282961"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/nouveau: avoid a use-after-free when BO init fails\nnouveau_bo_init() is backed by ttm_bo_init() and ferries its return code\nback to the caller. On failures, ttm_bo_init() invokes the provided\ndestructor which should de-initialize and free the memory.\nThus, when nouveau_bo_init() returns an error the gem object has already\nbeen released and the memory freed by nouveau_bo_del_ttm()."], "name": "CVE-2020-36788", "package_state": [{"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": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-36788\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-36788\nhttps://lore.kernel.org/linux-cve-announce/2024052134-CVE-2020-36788-06ab@gregkh/T"], "threat_severity": "Moderate"}

{}