{"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"]}]}]}}