{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31476","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-03-09T15:48:24.098Z","datePublished":"2026-04-22T13:54:04.779Z","dateUpdated":"2026-05-11T22:09:28.365Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:09:28.365Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: do not expire session on binding failure\n\nWhen a multichannel session binding request fails (e.g. wrong password),\nthe error path unconditionally sets sess->state = SMB2_SESSION_EXPIRED.\nHowever, during binding, sess points to the target session looked up via\nksmbd_session_lookup_slowpath() -- which belongs to another connection's\nuser. This allows a remote attacker to invalidate any active session by\nsimply sending a binding request with a wrong password (DoS).\n\nFix this by skipping session expiration when the failed request was\na binding attempt, since the session does not belong to the current\nconnection. The reference taken by ksmbd_session_lookup_slowpath() is\nstill correctly released via ksmbd_user_session_put()."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","baseScore":8.2,"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/smb2pdu.c"],"versions":[{"version":"f5a544e3bab78142207e0242d22442db85ba1eff","lessThan":"f5300690c23c5ac860499bb37dbc09cf43fd62e6","status":"affected","versionType":"git"},{"version":"f5a544e3bab78142207e0242d22442db85ba1eff","lessThan":"6fafc4c4238e538969f1375f9ecdc6587c53f1cc","status":"affected","versionType":"git"},{"version":"f5a544e3bab78142207e0242d22442db85ba1eff","lessThan":"1d1888b4a7aec518b707f6eca0bf08992c0e8da3","status":"affected","versionType":"git"},{"version":"f5a544e3bab78142207e0242d22442db85ba1eff","lessThan":"a897064a457056acb976e20e3007cdf553de340f","status":"affected","versionType":"git"},{"version":"f5a544e3bab78142207e0242d22442db85ba1eff","lessThan":"e0e5edc81b241c70355217de7e120c97c3429deb","status":"affected","versionType":"git"},{"version":"f5a544e3bab78142207e0242d22442db85ba1eff","lessThan":"9bbb19d21ded7d78645506f20d8c44895e3d0fb9","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/smb2pdu.c"],"versions":[{"version":"5.15","status":"affected"},{"version":"0","lessThan":"5.15","status":"unaffected","versionType":"semver"},{"version":"6.1.168","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.131","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.80","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.21","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.11","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","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":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.6.131"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.12.80"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.18.21"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.19.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/f5300690c23c5ac860499bb37dbc09cf43fd62e6"},{"url":"https://git.kernel.org/stable/c/6fafc4c4238e538969f1375f9ecdc6587c53f1cc"},{"url":"https://git.kernel.org/stable/c/1d1888b4a7aec518b707f6eca0bf08992c0e8da3"},{"url":"https://git.kernel.org/stable/c/a897064a457056acb976e20e3007cdf553de340f"},{"url":"https://git.kernel.org/stable/c/e0e5edc81b241c70355217de7e120c97c3429deb"},{"url":"https://git.kernel.org/stable/c/9bbb19d21ded7d78645506f20d8c44895e3d0fb9"}],"title":"ksmbd: do not expire session on binding failure","x_generator":{"engine":"bippy-1.2.0"}}}}