{ "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" ] }, { 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