{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-52480", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-20T12:30:33.300Z", "datePublished": "2024-02-29T05:43:12.019Z", "dateUpdated": "2026-08-15T12:23:49.816Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-15T12:23:49.816Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix race condition between session lookup and expire\n\n Thread A + Thread B\n ksmbd_session_lookup | smb2_sess_setup\n sess = xa_load |\n |\n | xa_erase(&conn->sessions, sess->id);\n |\n | ksmbd_session_destroy(sess) --> kfree(sess)\n |\n // UAF! |\n sess->last_active = jiffies |\n +\n\nThis patch add rwsem to fix race condition between ksmbd_session_lookup\nand ksmbd_expire_session." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - ksmbd is the in-kernel SMB server on TCP/445; the UAF is reached by processing remotely supplied SMB2 SESSION_SETUP and concurrent session-bearing PDUs in ksmbd worker threads, with no local access required.\nAC:L - The attacker controls both sides of the race by sending concurrent requests on the same connection—one path calls unlocked ksmbd_session_lookup while another SESSION_SETUP(SessionId=0) runs ksmbd_session_register→ksmbd_expire_session→kfree—and can retry freely via the ksmbd-io workqueue.\nPR:N - SESSION_SETUP with SessionId=0 creates an SMB2_SESSION_IN_PROGRESS session before any credential check, and expire destroys any non-VALID session; smb2_check_user_session still enters ksmbd_session_lookup and performs the UAF write before the VALID-state filter, so no authentication is required.\nUI:N - Exploitation is driven entirely by the remote attacker’s SMB traffic to ksmbd; no local user or administrator action is needed beyond ksmbd already listening.\nS:U - This is a standard in-kernel use-after-free within the host kernel’s security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The race is a use-after-free on struct ksmbd_session; reclaiming the freed object (including forging state==VALID so lookup_all returns a dangling sess) yields a kernel read primitive over session keys, pointers, and adjacent heap.\nI:H - ksmbd_session_lookup performs a write of jiffies into freed session memory, and a reclaimed fake session is then consumed by later SMB command handling—an exploitable UAF write/control-flow hijack primitive in ring 0.\nA:H - Even without full exploitation, the UAF read/write on a kfree’d session crashes ksmbd worker threads (KASAN slab-UAF / oops/panic), and an unauthenticated attacker can retrigger the race indefinitely." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/server/connection.c", "fs/smb/server/connection.h", "fs/smb/server/mgmt/user_session.c" ], "versions": [ { "version": "a6a9601ba995d0fec635324cb9fd8d14f9bea14e", "lessThan": "c77fd3e25a51ac92b0f1b347a96eff6a0b4f066f", "status": "affected", "versionType": "git" }, { "version": "1fc8a2b14ef5223f8e0b95faba2ee0a6e4d0f99d", "lessThan": "a2ca5fd3dbcc665e1169044fa0c9e3eba779202b", "status": "affected", "versionType": "git" }, { "version": "ea174a91893956450510945a0c5d1a10b5323656", "lessThan": "18ced78b0ebccc2d16f426143dc56ab3aad666be", "status": "affected", "versionType": "git" }, { "version": "ea174a91893956450510945a0c5d1a10b5323656", "lessThan": "53ff5cf89142b978b1a5ca8dc4d4425e6a09745f", "status": "affected", "versionType": "git" }, { "version": "750a2d772e9d9ff377fd32e3b6797bf2cd847a7a", "status": "affected", "versionType": "git" }, { "version": "6775ee7ef4b37c521aa4cf3730f54554c4875542", "status": "affected", "versionType": "git" }, { "version": "6.1.29", "lessThan": "6.1.57", "status": "affected", "versionType": "semver" }, { "version": "6.2.16", "lessThan": "6.3", "status": "affected", "versionType": "semver" }, { "version": "6.3.2", "lessThan": "6.4", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/server/connection.c", "fs/smb/server/connection.h", "fs/smb/server/mgmt/user_session.c" ], "versions": [ { "version": "6.4", "status": "affected" }, { "version": "0", "lessThan": "6.4", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.57", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5.7", "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": "6.1.29", "versionEndExcluding": "6.1.57" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.5.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c77fd3e25a51ac92b0f1b347a96eff6a0b4f066f" }, { "url": "https://git.kernel.org/stable/c/a2ca5fd3dbcc665e1169044fa0c9e3eba779202b" }, { "url": "https://git.kernel.org/stable/c/18ced78b0ebccc2d16f426143dc56ab3aad666be" }, { "url": "https://git.kernel.org/stable/c/53ff5cf89142b978b1a5ca8dc4d4425e6a09745f" } ], "title": "ksmbd: fix race condition between session lookup and expire", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T23:03:19.830Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/c77fd3e25a51ac92b0f1b347a96eff6a0b4f066f", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/a2ca5fd3dbcc665e1169044fa0c9e3eba779202b", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/18ced78b0ebccc2d16f426143dc56ab3aad666be", "tags": [ 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