{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-52442", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-20T12:30:33.291Z", "datePublished": "2024-02-21T07:21:01.814Z", "dateUpdated": "2026-08-05T09:09:59.894Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:09:59.894Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate session id and tree id in compound request\n\n`smb2_get_msg()` in smb2_get_ksmbd_tcon() and smb2_check_user_session()\nwill always return the first request smb2 header in a compound request.\nif `SMB2_TREE_CONNECT_HE` is the first command in compound request, will\nreturn 0, i.e. The tree id check is skipped.\nThis patch use ksmbd_req_buf_next() to get current command in compound." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 9.1, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable code is in ksmbd (fs/smb/server/), the in-kernel SMB server reachable over TCP/445; a remote attacker triggers it by sending a crafted compound SMB2 request.\nAC:L - The attacker fully controls the compound request layout and can reliably place TREE_CONNECT (or CANCEL/LOGOFF) first so subsequent commands skip tree-id validation; no races or unpredictable conditions are required.\nPR:N - ZDI-24-227 states authentication is not required; the most severe reasonable deployment includes guest/anonymous ksmbd shares, and compound handling is reachable without verified credentials.\nUI:N - Exploitation requires only sending SMB2 packets to the ksmbd service; no victim user action is needed.\nS:U - Impact is confined to the host kernel/SMB authority (DoS and possible disclosure); this is not a VM escape, IOMMU bypass, or other cross-authority boundary change.\nC:H - ZDI classifies this as an information-disclosure vulnerability from improper chained-request validation; when uncertain between C:N (pure crash) and C:H, the higher severity is selected.\nI:N - The direct bug is skipped session/tree validation leading to NULL dereference and disclosure potential; it does not by itself provide a write or integrity-corruption primitive.\nA:H - Skipping tree validation leaves work->tcon NULL so subsequent compound commands (e.g. CREATE/OPEN) dereference NULL (tcon->share_conf), causing a kernel oops and denying service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/server/smb2pdu.c" ], "versions": [ { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "017d85c94f02090a87f4a473dbe0d6ee0da72693", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "becb5191d1d5fdfca0198a2e37457bbbf4fe266f", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "4c2b350b2e269e3fd17bbfa42de1b42775b777ac", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "3df0411e132ee74a87aa13142dfd2b190275332e", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/server/smb2pdu.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.145", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.53", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4.16", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5", "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": "5.15", "versionEndExcluding": "5.15.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.53" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.4.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.5" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/017d85c94f02090a87f4a473dbe0d6ee0da72693" }, { "url": "https://git.kernel.org/stable/c/becb5191d1d5fdfca0198a2e37457bbbf4fe266f" }, { "url": "https://git.kernel.org/stable/c/4c2b350b2e269e3fd17bbfa42de1b42775b777ac" }, { "url": "https://git.kernel.org/stable/c/3df0411e132ee74a87aa13142dfd2b190275332e" } ], "title": "ksmbd: validate session id and tree id in compound request", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "lang": "en", "description": "CWE-noinfo Not enough information" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2024-02-21T20:10:42.657502Z", "id": "CVE-2023-52442", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T19:11:27.132Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T22:55:41.791Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/017d85c94f02090a87f4a473dbe0d6ee0da72693", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/becb5191d1d5fdfca0198a2e37457bbbf4fe266f", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/4c2b350b2e269e3fd17bbfa42de1b42775b777ac", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/3df0411e132ee74a87aa13142dfd2b190275332e", "tags": [ "x_transferred" ] } ] } ] } }