CVE-2026-46233

In the Linux kernel, the following vulnerability has been resolved:

batman-adv: bla: only purge non-released claims

When batadvblapurgeclaims() goes through the list of claims, it is only traversing the hash list with an rcureadlock(). Due to a potential parallel batadvclaimput(), it can happen that it encounters a claim which was actually in the process of being released+freed by batadvclaimrelease(). In this case, backbonegw is set to NULL before the delayed RCU kfree is started. Calling batadvblaclaimgetbackbone_gw() is then no longer allowed because it would cause a NULL-ptr derefence.

To avoid this, only claims with a valid reference counter must be purged. All others are already taken care of.