CVE-2026-31610

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If a later element in\nthe same blob is malformed, then the decoder will return nonzero after\nthe allocation is already live. This could happen if mechListMIC [3]\noverrunse the enclosing SEQUENCE.\n\ndecode_negotiation_token() then sets conn->use_spnego = false because\nboth the negTokenInit and negTokenTarg grammars failed. The cleanup at\nthe bottom of smb2_sess_setup() is gated on use_spnego:\n\n\tif (conn->use_spnego && conn->mechToken) {\n\t\tkfree(conn->mechToken);\n\t\tconn->mechToken = NULL;\n\t}\n\nso the kfree is skipped, causing the mechToken to never be freed.\n\nThis codepath is reachable pre-authentication, so untrusted clients can\ncause slow memory leaks on a server without even being properly\nauthenticated.\n\nFix this up by not checking check for use_spnego, as it's not required,\nso the memory will always be properly freed. At the same time, always\nfree the memory in ksmbd_conn_free() incase some other failure path\nforgot to free it."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/connection.c", "fs/smb/server/smb2pdu.c"], "versions": [{"version": "fad4161b5cd01a24202234976ebbb133f7adc0b5", "lessThan": "ae9cdb29efed20ffdee9ff3b0bb72fb369c353da", "status": "affected", "versionType": "git"}, {"version": "fad4161b5cd01a24202234976ebbb133f7adc0b5", "lessThan": "bd4a7fb04f06f419b0e93d8b52fe32067eb312d1", "status": "affected", "versionType": "git"}, {"version": "fad4161b5cd01a24202234976ebbb133f7adc0b5", "lessThan": "745a535461bbb90a56d9357573c9f97a5c12abe1", "status": "affected", "versionType": "git"}, {"version": "fad4161b5cd01a24202234976ebbb133f7adc0b5", "lessThan": "dd577cb55588ec3fbc66af3621280306601c4192", "status": "affected", "versionType": "git"}, {"version": "fad4161b5cd01a24202234976ebbb133f7adc0b5", "lessThan": "dd53414e301beb915fe672dc4c4a51bafb917604", "status": "affected", "versionType": "git"}, {"version": "fad4161b5cd01a24202234976ebbb133f7adc0b5", "lessThan": "269c800a7a7e363459291885b35f7bc72e231ed6", "status": "affected", "versionType": "git"}, {"version": "fad4161b5cd01a24202234976ebbb133f7adc0b5", "lessThan": "6c8c44e6553b9f072f62d9875e567766eb293162", "status": "affected", "versionType": "git"}, {"version": "fad4161b5cd01a24202234976ebbb133f7adc0b5", "lessThan": "ad0057fb91218914d6c98268718ceb9d59b388e1", "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/connection.c", "fs/smb/server/smb2pdu.c"], "versions": [{"version": "5.15", "status": "affected"}, {"version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.136", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.83", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.24", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.14", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.1", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.136"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.83"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.24"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.19.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.0.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/ae9cdb29efed20ffdee9ff3b0bb72fb369c353da"}, {"url": "https://git.kernel.org/stable/c/bd4a7fb04f06f419b0e93d8b52fe32067eb312d1"}, {"url": "https://git.kernel.org/stable/c/745a535461bbb90a56d9357573c9f97a5c12abe1"}, {"url": "https://git.kernel.org/stable/c/dd577cb55588ec3fbc66af3621280306601c4192"}, {"url": "https://git.kernel.org/stable/c/dd53414e301beb915fe672dc4c4a51bafb917604"}, {"url": "https://git.kernel.org/stable/c/269c800a7a7e363459291885b35f7bc72e231ed6"}, {"url": "https://git.kernel.org/stable/c/6c8c44e6553b9f072f62d9875e567766eb293162"}, {"url": "https://git.kernel.org/stable/c/ad0057fb91218914d6c98268718ceb9d59b388e1"}], "title": "ksmbd: fix mechToken leak when SPNEGO decode fails after token alloc", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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When ksmbd_decode_negTokenInit() reaches the mechToken\n[2] OCTET STRING element, ksmbd_neg_token_alloc() allocates\nconn->mechToken immediately via kmemdup_nul(). If a later element in\nthe same blob is malformed, then the decoder will return nonzero after\nthe allocation is already live. This could happen if mechListMIC [3]\noverrunse the enclosing SEQUENCE.\n\ndecode_negotiation_token() then sets conn->use_spnego = false because\nboth the negTokenInit and negTokenTarg grammars failed. The cleanup at\nthe bottom of smb2_sess_setup() is gated on use_spnego:\n\n\tif (conn->use_spnego && conn->mechToken) {\n\t\tkfree(conn->mechToken);\n\t\tconn->mechToken = NULL;\n\t}\n\nso the kfree is skipped, causing the mechToken to never be freed.\n\nThis codepath is reachable pre-authentication, so untrusted clients can\ncause slow memory leaks on a server without even being properly\nauthenticated.\n\nFix this up by not checking check for use_spnego, as it's not required,\nso the memory will always be properly freed. At the same time, always\nfree the memory in ksmbd_conn_free() incase some other failure path\nforgot to free it."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nksmbd: corrige la fuga de mechToken cuando la decodificaci\u00f3n SPNEGO falla despu\u00e9s de la asignaci\u00f3n del token\n\nEl decodificador BER ASN.1 del kernel llama a las devoluciones de llamada de acci\u00f3n incrementalmente a medida que recorre la entrada. Cuando ksmbd_decode_negTokenInit() alcanza el elemento OCTET STRING mechToken [2], ksmbd_neg_token_alloc() asigna conn -> mechToken inmediatamente a trav\u00e9s de kmemdup_nul(). Si un elemento posterior en el mismo blob est\u00e1 malformado, entonces el decodificador devolver\u00e1 un valor distinto de cero despu\u00e9s de que la asignaci\u00f3n ya est\u00e9 activa. Esto podr\u00eda ocurrir si mechListMIC [3] excede la SEQUENCE que lo contiene.\n\ndecode_negotiation_token() luego establece conn -> use_spnego = false porque ambas gram\u00e1ticas negTokenInit y negTokenTarg fallaron. La limpieza al final de smb2_sess_setup() est\u00e1 condicionada por use_spnego:\n\n\tsi (conn -> use_spnego && conn -> mechToken) {\n\t\tkfree(conn -> mechToken);\n\t\tconn -> mechToken = NULL;\n\t}\n\npor lo que el kfree se omite, haciendo que el mechToken nunca sea liberado.\n\nEsta ruta de c\u00f3digo es alcanzable pre-autenticaci\u00f3n, por lo que los clientes no confiables pueden causar fugas de memoria lentas en un servidor sin siquiera estar correctamente autenticados.\n\nSoluciona esto al no verificar use_spnego, ya que no es necesario, por lo que la memoria siempre ser\u00e1 liberada correctamente. Al mismo tiempo, libera siempre la memoria en ksmbd_conn_free() en caso de que alguna otra ruta de fallo olvidara liberarla."}], "id": "CVE-2026-31610", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-04-24T15:16:40.257", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/269c800a7a7e363459291885b35f7bc72e231ed6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6c8c44e6553b9f072f62d9875e567766eb293162"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/745a535461bbb90a56d9357573c9f97a5c12abe1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ad0057fb91218914d6c98268718ceb9d59b388e1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ae9cdb29efed20ffdee9ff3b0bb72fb369c353da"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bd4a7fb04f06f419b0e93d8b52fe32067eb312d1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dd53414e301beb915fe672dc4c4a51bafb917604"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dd577cb55588ec3fbc66af3621280306601c4192"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ksmbd: fix mechToken leak when SPNEGO decode fails after token alloc", "id": "2461443", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461443"}, "csaw": false, "cwe": "CWE-772", "details": ["A flaw was found in ksmbd, a component of the Linux kernel. A remote, unauthenticated attacker could exploit a flaw in the SPNEGO (Simple and Protected GSSAPI Negotiation Mechanism) decode process. This could lead to a memory leak, potentially causing a Denial of Service (DoS) on the affected system."], "name": "CVE-2026-31610", "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": "2026-04-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31610\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31610\nhttps://lore.kernel.org/linux-cve-announce/2026042421-CVE-2026-31610-40ea@gregkh/T"]}

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