Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: ksmbd: safely drain sessions during logoff SMB3 multichannel allows requests for one session to run on multiple connections. Wait for all channels bound to a session before freeing shared session objects. A deferred byte-range lock remains counted as a running request and only wakes when its file closes. Wake blocked locks during the drain without unpublishing or modifying their file objects. Synchronous CANCEL requests must invoke their cancellation callback to wake pending operations, while CHANGE_NOTIFY completion remains specific to the asynchronous path. Serialize session teardown with channel registration and previous-session cleanup, and use atomic work-state transitions so LOGOFF, CANCEL, and connection teardown invoke cancellation callbacks only once.

Affected versions

Linux: 76e98a158b207771a6c9a0de0a60522a446a3447 through before a7e6df0bb92642bee4431b2b85c69ada1e463b21 (git); 76e98a158b207771a6c9a0de0a60522a446a3447 through before d12168084c8c1b6d883c8eca5853929ac5136a9e (git); 118fd997612d1efc94a86c307c6c6d659ebe29fc (git); c1e55020534c4aafbc38d8f5c4583ff30755ac18 (git); 6.6.48 through before 6.7 (semver); 6.10.7 through before 6.11 (semver); 6.11 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.