CVE-2026-31611

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If sid_unix_NFS_mode is\nthe prefix S-1-5-88-3 with num_subauth = 2 then compare_sids() compares\nonly min(num_subauth, 2) sub-authorities so a client SID with\nnum_subauth = 2 and sub_auth = {88, 3} will match.\n\nIf num_subauth = 2 and the ACE is placed at the very end of the security\ndescriptor, sub_auth[2] will be 4 bytes past end_of_acl. The\nout-of-band bytes will then be masked to the low 9 bits and applied as\nthe file's POSIX mode, probably not something that is good to have\nhappen.\n\nFix this up by forcing the SID to actually carry a third sub-authority\nbefore reading it at all."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H", "baseScore": 8.6, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable parser is in ksmbd, the in-kernel SMB server, and is reachable through SMB2 requests over the network.\nAC:L - A crafted security descriptor with an S-1-5-88-3 SID carrying only two sub-authorities can deterministically reach the out-of-bounds read; no race or external timing condition is required.\nPR:N - The path requires a valid SMB session and tree connection, but ksmbd supports guest/anonymous access and writable guest shares, making unauthenticated network reachability a reasonable high-severity deployment scenario.\nUI:N - No victim action is required after the attacker can connect to the SMB service; the attacker sends the crafted SMB2 request directly.\nS:U - The impact remains within the ksmbd/kernel and exported filesystem security authority, without a VM escape or separate security-domain boundary crossing.\nC:L - The bug performs a bounded 4-byte out-of-bounds read whose low mode bits can be reflected into the resulting file mode; this is a limited information exposure, not arbitrary memory disclosure.\nI:L - The out-of-bounds value is applied as POSIX permission bits, allowing constrained access-control modification of a reachable filesystem object rather than arbitrary kernel memory modification.\nA:H - The crafted read can be placed past the validated ACL/security-descriptor boundary and plausibly at the received PDU allocation edge, making a repeatable kernel oops/DoS defensible."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": 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"https://git.kernel.org/stable/c/53370cf9090777774e07fd9a8ebce67c6cc333ab"}], "title": "ksmbd: require 3 sub-authorities before reading sub_auth[2]", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-10-15T01:17:10.339Z"}, "affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}]}]}}

{}

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If sid_unix_NFS_mode is\nthe prefix S-1-5-88-3 with num_subauth = 2 then compare_sids() compares\nonly min(num_subauth, 2) sub-authorities so a client SID with\nnum_subauth = 2 and sub_auth = {88, 3} will match.\n\nIf num_subauth = 2 and the ACE is placed at the very end of the security\ndescriptor, sub_auth[2] will be 4 bytes past end_of_acl. The\nout-of-band bytes will then be masked to the low 9 bits and applied as\nthe file's POSIX mode, probably not something that is good to have\nhappen.\n\nFix this up by forcing the SID to actually carry a third sub-authority\nbefore reading it at all."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nksmbd: requiere 3 subautoridades antes de leer sub_auth[2]\n\nparse_dacl() compara cada SID de ACE contra sid_unix_NFS_mode y, en caso de coincidencia, lee sid.sub_auth[2] como el modo de archivo. Si sid_unix_NFS_mode es el prefijo S-1-5-88-3 con num_subauth = 2, entonces compare_sids() compara solo min(num_subauth, 2) subautoridades, por lo que un SID de cliente con num_subauth = 2 y sub_auth = {88, 3} coincidir\u00e1.\n\nSi num_subauth = 2 y el ACE se coloca al final del descriptor de seguridad, sub_auth[2] estar\u00e1 4 bytes m\u00e1s all\u00e1 de end_of_acl. Los bytes fuera de banda se enmascarar\u00e1n entonces a los 9 bits bajos y se aplicar\u00e1n como el modo POSIX del archivo, probablemente no sea algo bueno que suceda.\n\nSolucione esto forzando al SID a llevar realmente una tercera subautoridad antes de leerlo en absoluto."}], "id": "CVE-2026-31611", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.7, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-04-24T15:16:40.360", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/08f9e6d899b5c834bbcc239eae1bed58d9b15d2c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/46bbcd3ebfb3549c8da1838fc4493e79bd3241e7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/53370cf9090777774e07fd9a8ebce67c6cc333ab"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9401f86a224f37b50e6a3ccf1d46a70d5ef8af0a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b5b5d5936a50497fb151c0b122899a6894721c2b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cf2148b880fb7c0fcd727202dbc4fd5d6998b9c2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d2454f4a002d08560a60f214f392e6491cf11560"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ksmbd: require 3 sub-authorities before reading sub_auth[2]", "id": "2461574", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461574"}, "csaw": false, "cwe": "CWE-1285", "details": ["A flaw was found in the ksmbd component of the Linux kernel. A remote attacker could exploit this vulnerability by sending a specially crafted Access Control Entry (ACE) that causes an out-of-bounds read when parsing security identifiers. This out-of-bounds read can lead to the application of arbitrary, unintended data as a file's POSIX mode, potentially resulting in incorrect file permissions and unauthorized access to files."], "name": "CVE-2026-31611", "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-2026-31611\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31611\nhttps://lore.kernel.org/linux-cve-announce/2026042422-CVE-2026-31611-6396@gregkh/T"]}

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