{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-52503", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-20T12:30:33.313Z", "datePublished": "2024-03-02T21:52:17.854Z", "dateUpdated": "2026-08-05T09:10:17.128Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:10:17.128Z" }, "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. 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": "757cc3e9ff1d72d014096399d6e2bf03974d9da1", "lessThan": "1c95574350cd63bc3c5c2fa06658010768f2a0ce", "status": "affected", "versionType": "git" }, { "version": "757cc3e9ff1d72d014096399d6e2bf03974d9da1", "lessThan": "f4384b3e54ea813868bb81a861bf5b2406e15d8f", "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/tee/amdtee/core.c" ], "versions": [ { "version": "5.6", "status": "affected" }, { "version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.199", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.136", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.59", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5.8", "lessThanOrEqual": "6.5.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6", "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": "5.6", "versionEndExcluding": "5.10.199" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.15.136" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.1.59" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.5.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.6" } ] } ] } ], "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" } ], "title": "tee: amdtee: fix use-after-free vulnerability in amdtee_close_session", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T23:03:20.580Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/da7ce52a2f6c468946195b116615297d3d113a27", "tags": [ "x_transferred" ] }, { "url": 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