CVE-2024-58087

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A lost race yields only a benign SMB error, so it can be retried indefinitely.\nPR:N - Two of the three unreferenced lookups live inside `smb2_sess_setup()` \u2014 the authentication handshake itself \u2014 and operate on attacker-supplied, sequentially-allocated (trivially enumerable) session IDs before any credential is verified, including `ksmbd_session_lookup_slowpath()` against the global session table. Additionally, `ntlm_authenticate()` skips password verification entirely for guest/anonymous users, so under the common \"map to guest\" configuration an unauthenticated peer obtains a VALID session and reaches all remaining paths.\nUI:N - Exploitation requires only that the attacker send SMB2 requests to the listening ksmbd service; no action by any local user or administrator is involved.\nS:U - The use-after-free corrupts kernel heap memory within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed `struct ksmbd_session` is read after free, including `smb3encryptionkey`/`smb3decryptionkey`/`smb3signingkey` \u2014 `encrypt_resp()` encrypts responses using whatever now occupies that slab, leaking freed kernel memory to the wire; controlling the reallocated `sess->user` and `file_table` pointers escalates this to arbitrary kernel read.\nI:H - The bug yields multiple write primitives on freed memory \u2014 `atomic_inc/dec` on `sess->refcnt`, `sess->state = SMB2_SESSION_EXPIRED`, `sess->user = NULL`, and `kfree(sess->Preauth_HashValue)` plus xarray-walking frees in `ksmbd_session_destroy()` \u2014 giving arbitrary-free and controlled-pointer corruption suitable for control-flow hijack, and `sess->user` directly governs SMB access-control decisions.\nA:H - Any lost race dereferences freed slab memory, reliably producing a kernel oops or panic in the ksmbd worker, and the attacker can trigger it repeatedly from the network to take down the file server."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/auth.c", "fs/smb/server/mgmt/user_session.c", "fs/smb/server/server.c", "fs/smb/server/smb2pdu.c"], "versions": [{"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "2107ab40629aeabbec369cf34b8cf0f288c3eb1b", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "37a0e2b362b3150317fb6e2139de67b1e29ae5ff", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "450a844c045ff0895d41b05a1cbe8febd1acfcfd", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "a39e31e22a535d47b14656a7d6a893c7f6cf758c", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "b95629435b84b9ecc0c765995204a4d8a913ed52", "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/auth.c", "fs/smb/server/mgmt/user_session.c", "fs/smb/server/server.c", "fs/smb/server/smb2pdu.c"], "versions": [{"version": "5.15", "status": "affected"}, {"version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.176", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.121", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.67", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.6", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13", "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": "5.15.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.121"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.67"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2107ab40629aeabbec369cf34b8cf0f288c3eb1b"}, {"url": "https://git.kernel.org/stable/c/37a0e2b362b3150317fb6e2139de67b1e29ae5ff"}, {"url": "https://git.kernel.org/stable/c/450a844c045ff0895d41b05a1cbe8febd1acfcfd"}, {"url": "https://git.kernel.org/stable/c/a39e31e22a535d47b14656a7d6a893c7f6cf758c"}, {"url": "https://git.kernel.org/stable/c/b95629435b84b9ecc0c765995204a4d8a913ed52"}, {"url": "https://www.zerodayinitiative.com/advisories/ZDI-25-100/"}], "title": "ksmbd: fix racy issue from session lookup and expire", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2024-58087", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2025-10-01T19:26:55.319254Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-667", "description": "CWE-667 Improper Locking"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T19:36:35.134Z"}}]}}

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A lost race yields only a benign SMB error, so it can be retried indefinitely.\nPR:N - Two of the three unreferenced lookups live inside `smb2_sess_setup()` \u2014 the authentication handshake itself \u2014 and operate on attacker-supplied, sequentially-allocated (trivially enumerable) session IDs before any credential is verified, including `ksmbd_session_lookup_slowpath()` against the global session table. Additionally, `ntlm_authenticate()` skips password verification entirely for guest/anonymous users, so under the common \"map to guest\" configuration an unauthenticated peer obtains a VALID session and reaches all remaining paths.\nUI:N - Exploitation requires only that the attacker send SMB2 requests to the listening ksmbd service; no action by any local user or administrator is involved.\nS:U - The use-after-free corrupts kernel heap memory within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed `struct ksmbd_session` is read after free, including `smb3encryptionkey`/`smb3decryptionkey`/`smb3signingkey` \u2014 `encrypt_resp()` encrypts responses using whatever now occupies that slab, leaking freed kernel memory to the wire; controlling the reallocated `sess->user` and `file_table` pointers escalates this to arbitrary kernel read.\nI:H - The bug yields multiple write primitives on freed memory \u2014 `atomic_inc/dec` on `sess->refcnt`, `sess->state = SMB2_SESSION_EXPIRED`, `sess->user = NULL`, and `kfree(sess->Preauth_HashValue)` plus xarray-walking frees in `ksmbd_session_destroy()` \u2014 giving arbitrary-free and controlled-pointer corruption suitable for control-flow hijack, and `sess->user` directly governs SMB access-control decisions.\nA:H - Any lost race dereferences freed slab memory, reliably producing a kernel oops or panic in the ksmbd worker, and the attacker can trigger it repeatedly from the network to take down the file server."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "2107ab40629aeabbec369cf34b8cf0f288c3eb1b", "versionType": "git"}, {"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "37a0e2b362b3150317fb6e2139de67b1e29ae5ff", "versionType": "git"}, {"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "450a844c045ff0895d41b05a1cbe8febd1acfcfd", "versionType": "git"}, {"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "a39e31e22a535d47b14656a7d6a893c7f6cf758c", "versionType": "git"}, {"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "b95629435b84b9ecc0c765995204a4d8a913ed52", "versionType": "git"}], "programFiles": ["fs/smb/server/auth.c", "fs/smb/server/mgmt/user_session.c", "fs/smb/server/server.c", "fs/smb/server/smb2pdu.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"status": "unaffected", "version": "0", "lessThan": "5.15", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.176", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.121", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.67", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.6", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.13", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/smb/server/auth.c", "fs/smb/server/mgmt/user_session.c", "fs/smb/server/server.c", "fs/smb/server/smb2pdu.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/2107ab40629aeabbec369cf34b8cf0f288c3eb1b"}, {"url": "https://git.kernel.org/stable/c/37a0e2b362b3150317fb6e2139de67b1e29ae5ff"}, {"url": "https://git.kernel.org/stable/c/450a844c045ff0895d41b05a1cbe8febd1acfcfd"}, {"url": "https://git.kernel.org/stable/c/a39e31e22a535d47b14656a7d6a893c7f6cf758c"}, {"url": "https://git.kernel.org/stable/c/b95629435b84b9ecc0c765995204a4d8a913ed52"}, {"url": "https://www.zerodayinitiative.com/advisories/ZDI-25-100/"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix racy issue from session lookup and expire\n\nIncrement the session reference count within the lock for lookup to avoid\nracy issue with session expire."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.176", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.121", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.67", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.6", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.13", "versionStartIncluding": "5.15"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:47:38.424Z"}}}, "cveMetadata": {"cveId": "CVE-2024-58087", "state": "PUBLISHED", "dateUpdated": "2026-08-05T11:47:38.424Z", "dateReserved": "2025-03-06T15:52:09.185Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-03-12T07:28:09.114Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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"vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0CB1A9BB-F95E-43DD-A2FD-147912FD91E5", "versionEndExcluding": "6.12.6", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*", "matchCriteriaId": "62567B3C-6CEE-46D0-BC2E-B3717FBF7D13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*", "matchCriteriaId": "5A073481-106D-4B15-B4C7-FB0213B8E1D4", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix racy issue from session lookup and expire\n\nIncrement the session reference count within the lock for lookup to avoid\nracy issue with session expire."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ksmbd: corrige problema de rapidez en la b\u00fasqueda y expiraci\u00f3n de la sesi\u00f3n Incrementa el recuento de referencia de sesi\u00f3n dentro del bloqueo para la b\u00fasqueda para evitar problemas de rapidez con la expiraci\u00f3n de la sesi\u00f3n."}], "id": "CVE-2024-58087", "lastModified": "2026-08-04T11:22:38.603", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-58087", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-10-01T19:26:55.319254Z", "version": "2.0.3"}}]}, "published": "2025-03-12T08:15:11.810", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2107ab40629aeabbec369cf34b8cf0f288c3eb1b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/37a0e2b362b3150317fb6e2139de67b1e29ae5ff"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/450a844c045ff0895d41b05a1cbe8febd1acfcfd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a39e31e22a535d47b14656a7d6a893c7f6cf758c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b95629435b84b9ecc0c765995204a4d8a913ed52"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch", "Third Party Advisory"], "url": "https://www.zerodayinitiative.com/advisories/ZDI-25-100/"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-667"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: ksmbd: fix racy issue from session lookup and expire", "id": "2351471", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2351471"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-667", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nksmbd: fix racy issue from session lookup and expire\nIncrement the session reference count within the lock for lookup to avoid\nracy issue with session expire."], "name": "CVE-2024-58087", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-03-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-58087\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-58087\nhttps://lore.kernel.org/linux-cve-announce/2025031253-CVE-2024-58087-d9e7@gregkh/T"], "threat_severity": "Important"}

{}