CVE-2023-52503

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For instance, if a session\nhas refcount == 1, and one thread tries to free this session via:\n\n kref_put(&sess->refcount, destroy_session);\n\nthe reference count will get decremented, and the next step would be to\ncall destroy_session(). However, if in another thread,\namdtee_open_session() is called before destroy_session() has completed\nexecution, alloc_session() may return 'sess' that will be freed up\nlater in destroy_session() leading to use-after-free in\namdtee_open_session.\n\nTo fix this issue, treat decrement of sess->refcount and removal of\n'sess' from session list in destroy_session() as a critical section, so\nthat it is executed atomically."}], "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 - The vulnerability is reached through TEE_IOC_OPEN_SESSION and TEE_IOC_CLOSE_SESSION ioctls on the amdtee client device (/dev/tee*), requiring local process access to the character device rather than network or adjacent packet delivery.\nAC:L - The attacker fully controls both sides of the race by sharing one tee_context fd across threads and concurrently issuing open_session and close_session for the same TA; per guidance, attacker-driven races are AC:L.\nPR:L - amdtee registers an unprivileged client tee device with no capability checks in tee_open or the ioctl path; access is only via device-node permissions, and normal TEE clients on AMD TEE deployments (e.g. Chromebooks) are unprivileged local users.\nUI:N - Exploitation requires only the attacker's own open/close session ioctls; no victim action such as mounting a filesystem or opening a malicious file is needed.\nS:U - The use-after-free is in the Linux kernel amdtee driver and impacts the host kernel's authority; this is standard local privilege escalation, not a VM/IOMMU/sandbox boundary crossing.\nC:H - Use-after-free of struct amdtee_session lets the attacker reclaim and control the freed object contents, enabling arbitrary kernel memory disclosure primitives.\nI:H - After the free, amdtee_open_session continues to write session_info and sess_mask under sess->lock on the dangling pointer, yielding a heap UAF write usable for control-flow hijacking or arbitrary kernel writes.\nA:H - Any use-after-free of a kernel session object can oops or panic the kernel when the dangling pointer is locked or dereferenced, so availability impact is High."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/tee/amdtee/core.c"], "versions": [{"version": "757cc3e9ff1d72d014096399d6e2bf03974d9da1", "lessThan": "da7ce52a2f6c468946195b116615297d3d113a27", "status": "affected", "versionType": "git"}, {"version": "757cc3e9ff1d72d014096399d6e2bf03974d9da1", "lessThan": "1680c82929bc14d706065f123dab77f2f1293116", "status": "affected", "versionType": "git"}, {"version": "757cc3e9ff1d72d014096399d6e2bf03974d9da1", "lessThan": "60c3e7a00db954947c265b55099c21b216f2a05c", "status": "affected", "versionType": "git"}, {"version": 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per guidance, attacker-driven races are AC:L.\nPR:L - amdtee registers an unprivileged client tee device with no capability checks in tee_open or the ioctl path; access is only via device-node permissions, and normal TEE clients on AMD TEE deployments (e.g. Chromebooks) are unprivileged local users.\nUI:N - Exploitation requires only the attacker's own open/close session ioctls; no victim action such as mounting a filesystem or opening a malicious file is needed.\nS:U - The use-after-free is in the Linux kernel amdtee driver and impacts the host kernel's authority; this is standard local privilege escalation, not a VM/IOMMU/sandbox boundary crossing.\nC:H - Use-after-free of struct amdtee_session lets the attacker reclaim and control the freed object contents, enabling arbitrary kernel memory disclosure primitives.\nI:H - After the free, amdtee_open_session continues to write session_info and sess_mask under sess->lock on the dangling pointer, yielding a heap UAF write usable for control-flow hijacking or arbitrary kernel writes.\nA:H - Any use-after-free of a kernel session object can oops or panic the kernel when the dangling pointer is locked or dereferenced, so availability impact is High."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "757cc3e9ff1d72d014096399d6e2bf03974d9da1", "lessThan": "da7ce52a2f6c468946195b116615297d3d113a27", "versionType": "git"}, {"status": "affected", "version": "757cc3e9ff1d72d014096399d6e2bf03974d9da1", "lessThan": "1680c82929bc14d706065f123dab77f2f1293116", "versionType": "git"}, {"status": "affected", "version": "757cc3e9ff1d72d014096399d6e2bf03974d9da1", "lessThan": "60c3e7a00db954947c265b55099c21b216f2a05c", "versionType": "git"}, {"status": "affected", "version": "757cc3e9ff1d72d014096399d6e2bf03974d9da1", "lessThan": "1c95574350cd63bc3c5c2fa06658010768f2a0ce", "versionType": "git"}, {"status": "affected", "version": "757cc3e9ff1d72d014096399d6e2bf03974d9da1", "lessThan": "f4384b3e54ea813868bb81a861bf5b2406e15d8f", "versionType": "git"}], "programFiles": ["drivers/tee/amdtee/core.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.6"}, {"status": "unaffected", "version": "0", "lessThan": "5.6", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.199", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.136", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.59", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.5.8", "versionType": "semver", "lessThanOrEqual": "6.5.*"}, {"status": "unaffected", "version": "6.6", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/tee/amdtee/core.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/da7ce52a2f6c468946195b116615297d3d113a27"}, {"url": "https://git.kernel.org/stable/c/1680c82929bc14d706065f123dab77f2f1293116"}, {"url": "https://git.kernel.org/stable/c/60c3e7a00db954947c265b55099c21b216f2a05c"}, {"url": "https://git.kernel.org/stable/c/1c95574350cd63bc3c5c2fa06658010768f2a0ce"}, {"url": "https://git.kernel.org/stable/c/f4384b3e54ea813868bb81a861bf5b2406e15d8f"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntee: amdtee: fix use-after-free vulnerability in amdtee_close_session\n\nThere is a potential race condition in amdtee_close_session that may\ncause use-after-free in amdtee_open_session. 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However, if in another thread,\namdtee_open_session() is called before destroy_session() has completed\nexecution, alloc_session() may return 'sess' that will be freed up\nlater in destroy_session() leading to use-after-free in\namdtee_open_session.\n\nTo fix this issue, treat decrement of sess->refcount and removal of\n'sess' from session list in destroy_session() as a critical section, so\nthat it is executed atomically."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.199", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.136", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.59", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.5.8", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6", "versionStartIncluding": "5.6"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:10:17.128Z"}}}, "cveMetadata": {"cveId": "CVE-2023-52503", "state": "PUBLISHED", "dateUpdated": "2026-08-05T09:10:17.128Z", "dateReserved": "2024-02-20T12:30:33.313Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-03-02T21:52:17.854Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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For instance, if a session\nhas refcount == 1, and one thread tries to free this session via:\n\n kref_put(&sess->refcount, destroy_session);\n\nthe reference count will get decremented, and the next step would be to\ncall destroy_session(). However, if in another thread,\namdtee_open_session() is called before destroy_session() has completed\nexecution, alloc_session() may return 'sess' that will be freed up\nlater in destroy_session() leading to use-after-free in\namdtee_open_session.\n\nTo fix this issue, treat decrement of sess->refcount and removal of\n'sess' from session list in destroy_session() as a critical section, so\nthat it is executed atomically."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: tee: amdtee: corrige la vulnerabilidad de Use After Free en amdtee_close_session Existe una posible condici\u00f3n de ejecuci\u00f3n en amdtee_close_session que puede causar el Use After Free en amdtee_open_session. Por ejemplo, si una sesi\u00f3n tiene refcount == 1 y un hilo intenta liberar esta sesi\u00f3n mediante: kref_put(&sess->refcount, destroy_session); el recuento de referencias disminuir\u00e1 y el siguiente paso ser\u00eda llamar a destroy_session(). Sin embargo, si en otro hilo, se llama a amdtee_open_session() antes de que destroy_session() haya completado la ejecuci\u00f3n, alloc_session() puede devolver 'sess' que se liberar\u00e1 m\u00e1s tarde en destroy_session(), lo que conducir\u00e1 a Use After Free en amdtee_open_session. Para solucionar este problema, trate la disminuci\u00f3n de sess->refcount y la eliminaci\u00f3n de 'sess' de la lista de sesiones en destroy_session() como una secci\u00f3n cr\u00edtica, para que se ejecute de forma at\u00f3mica."}], "id": "CVE-2023-52503", "lastModified": "2026-08-04T10:18:30.827", "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": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-52503", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-08-08T18:34:27.896164Z", "version": "2.0.3"}}]}, "published": "2024-03-02T22:15:47.250", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1680c82929bc14d706065f123dab77f2f1293116"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1c95574350cd63bc3c5c2fa06658010768f2a0ce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/60c3e7a00db954947c265b55099c21b216f2a05c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/da7ce52a2f6c468946195b116615297d3d113a27"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f4384b3e54ea813868bb81a861bf5b2406e15d8f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1680c82929bc14d706065f123dab77f2f1293116"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1c95574350cd63bc3c5c2fa06658010768f2a0ce"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/60c3e7a00db954947c265b55099c21b216f2a05c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/da7ce52a2f6c468946195b116615297d3d113a27"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f4384b3e54ea813868bb81a861bf5b2406e15d8f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: tee: amdtee: fix use-after-free vulnerability in amdtee_close_session", "id": "2267780", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2267780"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntee: amdtee: fix use-after-free vulnerability in amdtee_close_session\nThere is a potential race condition in amdtee_close_session that may\ncause use-after-free in amdtee_open_session. For instance, if a session\nhas refcount == 1, and one thread tries to free this session via:\nkref_put(&sess->refcount, destroy_session);\nthe reference count will get decremented, and the next step would be to\ncall destroy_session(). However, if in another thread,\namdtee_open_session() is called before destroy_session() has completed\nexecution, alloc_session() may return 'sess' that will be freed up\nlater in destroy_session() leading to use-after-free in\namdtee_open_session.\nTo fix this issue, treat decrement of sess->refcount and removal of\n'sess' from session list in destroy_session() as a critical section, so\nthat it is executed atomically."], "name": "CVE-2023-52503", "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": "2024-03-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-52503\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-52503\nhttps://lore.kernel.org/linux-cve-announce/2024030248-CVE-2023-52503-cb3a@gregkh/T/#u"], "threat_severity": "Low"}

{}