CVE-2026-31712

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31712", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.133Z", "datePublished": "2026-05-01T13:56:08.583Z", "dateUpdated": "2026-10-15T01:18:08.369Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:24:46.463Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: require minimum ACE size in smb_check_perm_dacl()\n\nBoth ACE-walk loops in smb_check_perm_dacl() only guard against an\nunder-sized remaining buffer, not against an ACE whose declared\n`ace->size` is smaller than the struct it claims to describe:\n\n if (offsetof(struct smb_ace, access_req) > aces_size)\n break;\n ace_size = le16_to_cpu(ace->size);\n if (ace_size > aces_size)\n break;\n\nThe first check only requires the 4-byte ACE header to be in bounds;\nit does not require access_req (4 bytes at offset 4) to be readable.\nAn attacker who has set a crafted DACL on a file they own can declare\nace->size == 4 with aces_size == 4, pass both checks, and then\n\n granted |= le32_to_cpu(ace->access_req); /* upper loop */\n compare_sids(&sid, &ace->sid); /* lower loop */\n\nreads access_req at offset 4 (OOB by up to 4 bytes) and ace->sid at\noffset 8 (OOB by up to CIFS_SID_BASE_SIZE + SID_MAX_SUB_AUTHORITIES\n* 4 bytes).\n\nTighten both loops to require\n\n ace_size >= offsetof(struct smb_ace, sid) + CIFS_SID_BASE_SIZE\n\nwhich is the smallest valid on-wire ACE layout (4-byte header +\n4-byte access_req + 8-byte sid base with zero sub-auths). Also\nreject ACEs whose sid.num_subauth exceeds SID_MAX_SUB_AUTHORITIES\nbefore letting compare_sids() dereference sub_auth[] entries.\n\nparse_sec_desc() already enforces an equivalent check (lines 441-448);\nsmb_check_perm_dacl() simply grew weaker validation over time.\n\nReachability: authenticated SMB client with permission to set an ACL\non a file. On a subsequent CREATE against that file, the kernel\nwalks the stored DACL via smb_check_perm_dacl() and triggers the\nOOB read. Not pre-auth, and the OOB read is not reflected to the\nattacker, but KASAN reports and kernel state corruption are\npossible."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H", "baseScore": 8.3, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - ksmbd is an in-kernel SMB server reachable over the network via SMB2/SMB3 requests, typically TCP/445. The vulnerable DACL walk is reached from remote SMB CREATE processing after a crafted stored ACL is present.\nAC:L - No race or uncontrollable timing is required; an attacker can set a malformed DACL and then trigger a subsequent CREATE against that file. ACL xattr support is a reasonable ksmbd deployment configuration, not an exploit-complexity barrier.\nPR:L - The path is not pre-authentication: SMB2 commands require a valid authenticated session and tree connect. The attacker needs ordinary SMB credentials with permission to set an ACL on a file they control, not kernel/root privileges.\nUI:N - After authentication, the attacker can send the ACL-setting and CREATE requests directly. No victim user action is required.\nS:U - The impact remains within the kernel/ksmbd host security authority. There is no VM, IOMMU, or sandbox boundary crossing.\nC:H - The bug causes attacker-triggered out-of-bounds reads from kernel heap data beyond the stored security descriptor, including SID fields. Although not directly reflected, this is more than a strictly bounded few-byte read and the higher-severity rule makes High appropriate.\nI:L - The out-of-bounds data is consumed as permission-check state such as ACE access bits, so it can corrupt ksmbd access-control decisions for the requested object. There is no clear arbitrary kernel write or control-flow hijack primitive, so the integrity impact is limited rather than High.\nA:H - The malformed ACE can reliably trigger kernel out-of-bounds reads during SMB CREATE, producing KASAN reports and possible kernel oops/panic depending on configuration. A remote authenticated user can repeat the trigger for denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/smbacl.c"], "versions": [{"version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "282cbbb476b9f35793452bc461934af4c7eca169", "status": "affected", "versionType": "git"}, {"version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "f20adc4ef7428bc485ee83fd1a592252fb87718b", "status": "affected", "versionType": "git"}, {"version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "325d4ac11f526cb8964cff14548ccf02d8c756d8", "status": "affected", "versionType": "git"}, {"version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "95e5aa3c3261da8c95b27d7aecf8ee39b9f86a4c", "status": "affected", "versionType": "git"}, {"version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "90089584b2e25c4510b7b987387b4405f0673ece", "status": "affected", "versionType": "git"}, {"version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "151b1799861fde38087c08f613abc2843ef597b0", "status": "affected", "versionType": "git"}, {"version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "d07b26f39246a82399661936dd0c853983cfade7", "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/smbacl.c"], "versions": [{"version": "5.15", "status": "affected"}, {"version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.84", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.25", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.2", "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": "5.15.210"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.140"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.84"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.25"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.0.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/282cbbb476b9f35793452bc461934af4c7eca169"}, {"url": "https://git.kernel.org/stable/c/f20adc4ef7428bc485ee83fd1a592252fb87718b"}, {"url": "https://git.kernel.org/stable/c/325d4ac11f526cb8964cff14548ccf02d8c756d8"}, {"url": "https://git.kernel.org/stable/c/95e5aa3c3261da8c95b27d7aecf8ee39b9f86a4c"}, {"url": "https://git.kernel.org/stable/c/90089584b2e25c4510b7b987387b4405f0673ece"}, {"url": "https://git.kernel.org/stable/c/151b1799861fde38087c08f613abc2843ef597b0"}, {"url": "https://git.kernel.org/stable/c/d07b26f39246a82399661936dd0c853983cfade7"}], "title": "ksmbd: require minimum ACE size in smb_check_perm_dacl()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-10-15T01:18:08.369Z"}, "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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Also\nreject ACEs whose sid.num_subauth exceeds SID_MAX_SUB_AUTHORITIES\nbefore letting compare_sids() dereference sub_auth[] entries.\n\nparse_sec_desc() already enforces an equivalent check (lines 441-448);\nsmb_check_perm_dacl() simply grew weaker validation over time.\n\nReachability: authenticated SMB client with permission to set an ACL\non a file. On a subsequent CREATE against that file, the kernel\nwalks the stored DACL via smb_check_perm_dacl() and triggers the\nOOB read. Not pre-auth, and the OOB read is not reflected to the\nattacker, but KASAN reports and kernel state corruption are\npossible."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:\n\nksmbd: requerir tama\u00f1o m\u00ednimo de ACE en smb_check_perm_dacl()\n\nAmbos bucles de recorrido de ACE en smb_check_perm_dacl() solo protegen contra un b\u00fafer restante de tama\u00f1o insuficiente, no contra un ACE cuyo \u2019ace -> size\u2019 declarado es m\u00e1s peque\u00f1o que la estructura que afirma describir:\n\n if (offsetof(struct smb_ace, access_req) > aces_size)\n break;\n ace_size = le16_to_cpu(ace -> size);\n if (ace_size > aces_size)\n break;\n\nLa primera comprobaci\u00f3n solo requiere que el encabezado ACE de 4 bytes est\u00e9 dentro de los l\u00edmites; no requiere que access_req (4 bytes en el desplazamiento 4) sea legible. Un atacante que ha establecido un DACL manipulado en un archivo de su propiedad puede declarar ace -> size == 4 con aces_size == 4, pasar ambas comprobaciones y luego\n\n granted |= le32_to_cpu(ace -> access_req); /* upper loop */\n compare_sids(&sid, &ace -> sid); /* lower loop */\n\nlee access_req en el desplazamiento 4 (fuera de l\u00edmites por hasta 4 bytes) y ace -> sid en el desplazamiento 8 (fuera de l\u00edmites por hasta CIFS_SID_BASE_SIZE + SID_MAX_SUB_AUTHORITIES * 4 bytes).\n\nAjustar ambos bucles para requerir\n\n ace_size >= offsetof(struct smb_ace, sid) + CIFS_SID_BASE_SIZE\n\nque es el dise\u00f1o de ACE en la red m\u00e1s peque\u00f1o y v\u00e1lido (encabezado de 4 bytes + access_req de 4 bytes + base sid de 8 bytes con cero sub-autoridades). Tambi\u00e9n rechazar ACEs cuyo sid.num_subauth excede SID_MAX_SUB_AUTHORITIES antes de permitir que compare_sids() desreferencie las entradas de sub_auth[].\n\nparse_sec_desc() ya aplica una comprobaci\u00f3n equivalente (l\u00edneas 441-448); smb_check_perm_dacl() simplemente desarroll\u00f3 una validaci\u00f3n m\u00e1s d\u00e9bil con el tiempo.\n\nAlcanzabilidad: cliente SMB autenticado con permiso para establecer una ACL en un archivo. En un CREATE posterior contra ese archivo, el kernel recorre el DACL almacenado a trav\u00e9s de smb_check_perm_dacl() y desencadena la lectura fuera de l\u00edmites (OOB). No es pre-autenticaci\u00f3n, y la lectura fuera de l\u00edmites (OOB) no se refleja al atacante, pero los informes de KASAN y la corrupci\u00f3n del estado del kernel son posibles."}], "id": "CVE-2026-31712", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.3, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.5, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-01T14:16:21.270", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/151b1799861fde38087c08f613abc2843ef597b0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/282cbbb476b9f35793452bc461934af4c7eca169"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/325d4ac11f526cb8964cff14548ccf02d8c756d8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/90089584b2e25c4510b7b987387b4405f0673ece"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/95e5aa3c3261da8c95b27d7aecf8ee39b9f86a4c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d07b26f39246a82399661936dd0c853983cfade7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f20adc4ef7428bc485ee83fd1a592252fb87718b"}, {"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": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ksmbd: require minimum ACE size in smb_check_perm_dacl()", "id": "2464447", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464447"}, "csaw": false, "cwe": "CWE-1284", "details": ["A flaw was found in the ksmbd component of the Linux kernel. An authenticated Server Message Block (SMB) client with permissions to set an Access Control List (ACL) on a file can craft a malicious Discretionary Access Control List (DACL). This crafted DACL, containing an undersized Access Control Entry (ACE), can lead to an out-of-bounds read when the kernel processes it during a subsequent file creation operation. This vulnerability could result in kernel state corruption."], "name": "CVE-2026-31712", "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": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31712\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31712\nhttps://lore.kernel.org/linux-cve-announce/2026050123-CVE-2026-31712-b794@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9,95e5aa3c3261da8c95b27d7aecf8ee39b9f86a4c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9,90089584b2e25c4510b7b987387b4405f0673ece)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9,151b1799861fde38087c08f613abc2843ef597b0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9,d07b26f39246a82399661936dd0c853983cfade7)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "5.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.84,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.25,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0.2,7.0.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-01T21:30:14.956028+00:00", "updated": "2026-05-06T22:00:14.060158+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}