CVE-2026-22992

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

libceph: return the handler error from mon_handle_auth_done()

Currently any error from ceph_auth_handle_reply_done() is propagated via finish_auth() but isn't returned from mon_handle_auth_done(). This results in higher layers learning that (despite the monitor considering us to be successfully authenticated) something went wrong in the authentication phase and reacting accordingly, but msgr2 still trying to proceed with establishing the session in the background. In the case of secure mode this can trigger a WARN in setup_crypto() and later lead to a NULL pointer dereference inside of prepare_auth_signature().

The monitor auth-done handler incorrectly returned success even when the authentication reply finalization reported an error, causing a state mismatch where msgr2 could continue session establishment in the background. In secure mode this can trigger a WARN and later a NULL pointer dereference in signature preparation, leading to a remote crash/DoS (network-reachable under a malicious/compromised monitor or MITM conditions).

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.