{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-52441","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-02-20T12:30:33.291Z","datePublished":"2024-02-21T07:21:01.075Z","dateUpdated":"2026-08-15T12:23:47.601Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-15T12:23:47.601Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix out of bounds in init_smb2_rsp_hdr()\n\nIf client send smb2 negotiate request and then send smb1 negotiate\nrequest, init_smb2_rsp_hdr is called for smb1 negotiate request since\nneed_neg is set to false. This patch ignore smb1 packets after ->need_neg\nis set to false."}],"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 bug is in ksmbd (fs/smb/server/), the in-kernel SMB server on TCP/445; init_smb2_rsp_hdr() runs while processing PDUs received from a remote peer via ksmbd_conn_handler_loop(), with no local access required.\nAC:L - The attacker reliably triggers the defect by sending an SMB2 negotiate (clearing need_neg) then an SMB1 negotiate on the same connection; both sides of the sequence and the small pdu_size that sizes the request slab object are fully attacker-controlled, with no race or external precondition.\nPR:N - The OOB occurs in init_rsp_hdr() during/after negotiate, before SESSION_SETUP and any credential check; smb2_check_user_session() does not require a session for negotiate, matching ZDI’s unauthenticated assessment (ZDI-CAN-21541).\nUI:N - Exploitation needs only attacker-sent SMB negotiate PDUs to an already-running ksmbd listener; no local user or administrator action is required.\nS:U - The out-of-bounds read and leaked response data stay within the host kernel/ksmbd security authority; this is not a VM escape, IOMMU bypass, or sandbox boundary cross.\nC:H - init_smb2_rsp_hdr() memcpy’s 16 bytes of Signature (and copies SessionId/TreeId) from past the end of the attacker-sized SMB1 request buffer into the response, which ksmbd_conn_write() returns to the unauthenticated peer—a groomable remote kernel-heap disclosure.\nI:N - The defect is a read past the request buffer; response writes stay inside the correctly allocated response buffer, so there is no out-of-bounds write or integrity/control-flow primitive from this bug alone.\nA:H - The overread past a tiny kmalloc request object can fault under KFENCE/DEBUG_PAGEALLOC or panic under KASAN/panic_on_warn (as in related KASAN reports), and the attacker can retrigger it pre-authentication at will."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/server.c","fs/smb/server/smb_common.c","fs/smb/server/smb_common.h"],"versions":[{"version":"51a8534c0f35c0401e45f1055f914729cad98bf9","lessThan":"5c0df9d30c289d6b9d7d44e2a450de2f8e3cf40b","status":"affected","versionType":"git"},{"version":"0b3ec5671ac06829ccebdaeec05acedfec327f42","lessThan":"330d900620dfc9893011d725b3620cd2ee0bc2bc","status":"affected","versionType":"git"},{"version":"39b291b86b5988bf8753c3874d5c773399d09b96","lessThan":"aa669ef229ae8dd779da9caa24e254964545895f","status":"affected","versionType":"git"},{"version":"39b291b86b5988bf8753c3874d5c773399d09b96","lessThan":"536bb492d39bb6c080c92f31e8a55fe9934f452b","status":"affected","versionType":"git"},{"version":"cc32cd98a0aee4cc3eb611cbce11795b1aaa738a","status":"affected","versionType":"git"},{"version":"5.15.105","lessThan":"5.15.145","status":"affected","versionType":"semver"},{"version":"6.1.22","lessThan":"6.1.53","status":"affected","versionType":"semver"},{"version":"6.2.9","lessThan":"6.3","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/server.c","fs/smb/server/smb_common.c","fs/smb/server/smb_common.h"],"versions":[{"version":"6.3","status":"affected"},{"version":"0","lessThan":"6.3","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":"5.15.105","versionEndExcluding":"5.15.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.22","versionEndExcluding":"6.1.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.4.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2.9"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/5c0df9d30c289d6b9d7d44e2a450de2f8e3cf40b"},{"url":"https://git.kernel.org/stable/c/330d900620dfc9893011d725b3620cd2ee0bc2bc"},{"url":"https://git.kernel.org/stable/c/aa669ef229ae8dd779da9caa24e254964545895f"},{"url":"https://git.kernel.org/stable/c/536bb492d39bb6c080c92f31e8a55fe9934f452b"}],"title":"ksmbd: fix out of bounds in init_smb2_rsp_hdr()","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-02T22:55:41.809Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/5c0df9d30c289d6b9d7d44e2a450de2f8e3cf40b","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/330d900620dfc9893011d725b3620cd2ee0bc2bc","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/aa669ef229ae8dd779da9caa24e254964545895f","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/536bb492d39bb6c080c92f31e8a55fe9934f452b","tags":["x_transferred"]}]},{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2023-52441","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-09-10T16:02:49.418159Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-09-11T17:33:54.916Z"}}]}}