CVE-2026-31717

{"id": "CVE-2026-31717", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "8df4bcdb0a4232192b2445256c39b787d58ef14d", "lessThan": "712cdf917e77a6444ce3836874829d770db20ee6", "versionType": "git"}, {"status": "affected", "version": "c8efcc786146a951091588e5fa7e3c754850cb3c", "lessThan": "c7f0f0d01c88bdcb8b1694d7d321670013f7ed7d", "versionType": "git"}, {"status": "affected", "version": "c8efcc786146a951091588e5fa7e3c754850cb3c", "lessThan": "00ce8d6789dae72d042a4522264964c72891ca37", "versionType": "git"}, {"status": "affected", "version": "c8efcc786146a951091588e5fa7e3c754850cb3c", "lessThan": "c908c853f304a4969b5aa10eba0b50350cc65b80", "versionType": "git"}, {"status": "affected", "version": "c8efcc786146a951091588e5fa7e3c754850cb3c", "lessThan": "49110a8ce654bbe56bef7c5e44cce31f4b102b8a", "versionType": "git"}, {"status": "affected", "version": "6.6.32", "lessThan": "6.6.142", "versionType": "semver"}], "programFiles": ["fs/smb/server/mgmt/user_session.c", "fs/smb/server/oplock.c", "fs/smb/server/oplock.h", "fs/smb/server/smb2pdu.c", "fs/smb/server/vfs_cache.c", "fs/smb/server/vfs_cache.h"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.9"}, {"status": "unaffected", "version": "0", "lessThan": "6.9", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.142", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.92", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.25", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.2", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/smb/server/mgmt/user_session.c", "fs/smb/server/oplock.c", "fs/smb/server/oplock.h", "fs/smb/server/smb2pdu.c", "fs/smb/server/vfs_cache.c", "fs/smb/server/vfs_cache.h"], "defaultStatus": "affected"}]}], "published": "2026-05-01T14:16:21.860", "references": [{"url": "https://git.kernel.org/stable/c/00ce8d6789dae72d042a4522264964c72891ca37", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/49110a8ce654bbe56bef7c5e44cce31f4b102b8a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/712cdf917e77a6444ce3836874829d770db20ee6", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c7f0f0d01c88bdcb8b1694d7d321670013f7ed7d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c908c853f304a4969b5aa10eba0b50350cc65b80", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate owner of durable handle on reconnect\n\nCurrently, ksmbd does not verify if the user attempting to reconnect\nto a durable handle is the same user who originally opened the file.\nThis allows any authenticated user to hijack an orphaned durable handle\nby predicting or brute-forcing the persistent ID.\n\nAccording to MS-SMB2, the server MUST verify that the SecurityContext\nof the reconnect request matches the SecurityContext associated with\nthe existing open.\nAdd a durable_owner structure to ksmbd_file to store the original opener's\nUID, GID, and account name. and catpure the owner information when a file\nhandle becomes orphaned. and implementing ksmbd_vfs_compare_durable_owner()\nto validate the identity of the requester during SMB2_CREATE (DHnC)."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nksmbd: validar el propietario del identificador duradero al reconectar\n\nActualmente, ksmbd no verifica si el usuario que intenta reconectar a un identificador duradero es el mismo usuario que abri\u00f3 originalmente el archivo. Esto permite a cualquier usuario autenticado secuestrar un identificador duradero hu\u00e9rfano prediciendo o forzando por fuerza bruta el ID persistente.\n\nSeg\u00fan MS-SMB2, el servidor DEBE verificar que el SecurityContext de la solicitud de reconexi\u00f3n coincide con el SecurityContext asociado con la apertura existente.\nA\u00f1adir una estructura durable_owner a ksmbd_file para almacenar el UID, GID y nombre de cuenta del abridor original. Y capturar la informaci\u00f3n del propietario cuando un identificador de archivo queda hu\u00e9rfano. E implementar ksmbd_vfs_compare_durable_owner() para validar la identidad del solicitante durante SMB2_CREATE (DHnC)."}], "lastModified": "2026-11-11T21:10:00.200", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2C15E547-F33F-4337-A576-685C65C6D439", "versionEndExcluding": "6.7", "versionStartIncluding": "6.6.32"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FB3AD8C5-FEB3-4B8C-A314-EFD501361AE9", "versionEndExcluding": "6.18.25", "versionStartIncluding": "6.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1BD58F1E-7C20-4C0D-92A2-FAC5CBFBE8A8", "versionEndExcluding": "7.0.2", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}