Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: do not expire session on binding failure When a multichannel session binding request fails (e.g. wrong password), the error path unconditionally sets sess->state = SMB2_SESSION_EXPIRED. However, during binding, sess points to the target session looked up via ksmbd_session_lookup_slowpath() -- which belongs to another connection's user. This allows a remote attacker to invalidate any active session by simply sending a binding request with a wrong password (DoS). Fix this by skipping session expiration when the failed request was a binding attempt, since the session does not belong to the current connection. The reference taken by ksmbd_session_lookup_slowpath() is still correctly released via ksmbd_user_session_put().
Product status
f5a544e3bab78142207e0242d22442db85ba1eff (git) before 4642ea35c03cf3d3558c009df4757cdb7af3f82d
f5a544e3bab78142207e0242d22442db85ba1eff (git) before f5300690c23c5ac860499bb37dbc09cf43fd62e6
f5a544e3bab78142207e0242d22442db85ba1eff (git) before 6fafc4c4238e538969f1375f9ecdc6587c53f1cc
f5a544e3bab78142207e0242d22442db85ba1eff (git) before 1d1888b4a7aec518b707f6eca0bf08992c0e8da3
f5a544e3bab78142207e0242d22442db85ba1eff (git) before a897064a457056acb976e20e3007cdf553de340f
f5a544e3bab78142207e0242d22442db85ba1eff (git) before e0e5edc81b241c70355217de7e120c97c3429deb
f5a544e3bab78142207e0242d22442db85ba1eff (git) before 9bbb19d21ded7d78645506f20d8c44895e3d0fb9
5.15
Any version before 5.15
5.15.209 (semver)
6.1.168 (semver)
6.6.131 (semver)
6.12.80 (semver)
6.18.21 (semver)
6.19.11 (semver)
7.0 (original_commit_for_fix)
References
git.kernel.org/...c/4642ea35c03cf3d3558c009df4757cdb7af3f82d
git.kernel.org/...c/f5300690c23c5ac860499bb37dbc09cf43fd62e6
git.kernel.org/...c/6fafc4c4238e538969f1375f9ecdc6587c53f1cc
git.kernel.org/...c/1d1888b4a7aec518b707f6eca0bf08992c0e8da3
git.kernel.org/...c/a897064a457056acb976e20e3007cdf553de340f
git.kernel.org/...c/e0e5edc81b241c70355217de7e120c97c3429deb
git.kernel.org/...c/9bbb19d21ded7d78645506f20d8c44895e3d0fb9