{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31717","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-03-09T15:48:24.134Z","datePublished":"2026-05-01T13:56:12.012Z","dateUpdated":"2026-05-11T22:14:23.754Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:14:23.754Z"},"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)."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"}}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","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"],"versions":[{"version":"c8efcc786146a951091588e5fa7e3c754850cb3c","lessThan":"00ce8d6789dae72d042a4522264964c72891ca37","status":"affected","versionType":"git"},{"version":"c8efcc786146a951091588e5fa7e3c754850cb3c","lessThan":"c908c853f304a4969b5aa10eba0b50350cc65b80","status":"affected","versionType":"git"},{"version":"c8efcc786146a951091588e5fa7e3c754850cb3c","lessThan":"49110a8ce654bbe56bef7c5e44cce31f4b102b8a","status":"affected","versionType":"git"},{"version":"8df4bcdb0a4232192b2445256c39b787d58ef14d","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/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"],"versions":[{"version":"6.9","status":"affected"},{"version":"0","lessThan":"6.9","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-rc1","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":"6.9","versionEndExcluding":"6.18.25"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.0.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.1-rc1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.32"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/00ce8d6789dae72d042a4522264964c72891ca37"},{"url":"https://git.kernel.org/stable/c/c908c853f304a4969b5aa10eba0b50350cc65b80"},{"url":"https://git.kernel.org/stable/c/49110a8ce654bbe56bef7c5e44cce31f4b102b8a"}],"title":"ksmbd: validate owner of durable handle on reconnect","x_generator":{"engine":"bippy-1.2.0"}}}}