CVE-2026-46024

Summary

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

libceph: Prevent potential null-ptr-deref in ceph_handle_auth_reply()

If a message of type CEPH_MSG_AUTH_REPLY contains a zero value for both protocol and result, this is currently not treated as an error. In case of ac->negotiating == true and ac->protocol > 0, this leads to setting ac->protocol = 0 and ac->ops = NULL. Thereafter, the check for ac->protocol != protocol returns false, and init_protocol() is not called. Subsequently, ac->ops->handle_reply() is called, which leads to a null pointer dereference, because ac->ops is still NULL.

This patch changes the check for ac->protocol != protocol to !ac->protocol, as this also includes the case when the protocol was set to zero in the message. This causes the message to be treated as containing a bad auth protocol.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 9ded62c302c0342efdb5eda3bf6e75720caad0dfaffected
LinuxLinux4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < f101271fcf55d7eacfefd610b51ec65f46ba8118affected
LinuxLinux4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 4b2738b93edad661178340239de657d876b73d3daffected
LinuxLinux4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 927e4bd5692f2a4901808822981fb2c8d4456548affected
LinuxLinux4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 016bc663657366d386993f63eb31072eb45a2b77affected
LinuxLinux4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 8f2be7285941a33a9f72579a23b96392f83c758eaffected
LinuxLinux4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 5199c125d25aeae8615c4fc31652cc0fe624338eaffected
LinuxLinux2.6.34affected
LinuxLinux0 < 2.6.34unaffected
LinuxLinux5.15.209 <= 5.15.*unaffected
LinuxLinux6.1.175 <= 6.1.*unaffected
LinuxLinux6.6.140 <= 6.6.*unaffected
LinuxLinux6.12.86 <= 6.12.*unaffected
LinuxLinux6.18.27 <= 6.18.*unaffected
LinuxLinux7.0.4 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References