CVE-2026-46024

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

State: Published
Severity: 7.5 High
Published: May 27, 2026
Updated: Oct 19, 2026
Reserved: May 13, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	Linux

Weaknesses

CWE-476 NULL Pointer Dereference

Affected Products

Product	Versions
LinuxLinux	4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc to before 9ded62c302c0342efdb5eda3bf6e75720caad0dfAffected 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc to before f101271fcf55d7eacfefd610b51ec65f46ba8118Affected 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc to before 4b2738b93edad661178340239de657d876b73d3dAffected 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc to before 927e4bd5692f2a4901808822981fb2c8d4456548Affected 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc to before 016bc663657366d386993f63eb31072eb45a2b77Affected 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc to before 8f2be7285941a33a9f72579a23b96392f83c758eAffected 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc to before 5199c125d25aeae8615c4fc31652cc0fe624338eAffected
LinuxLinux	2.6.34Affected before 2.6.34Not affected 5.15.209 through 5.15.Not affected 6.1.175 through 6.1.Not affected 6.6.140 through 6.6.Not affected 6.12.86 through 6.12.Not affected 6.18.27 through 6.18.Not affected 7.0.4 through 7.0.Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc to before 9ded62c302c0342efdb5eda3bf6e75720caad0dfAffected
4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc to before f101271fcf55d7eacfefd610b51ec65f46ba8118Affected
4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc to before 4b2738b93edad661178340239de657d876b73d3dAffected
4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc to before 927e4bd5692f2a4901808822981fb2c8d4456548Affected
4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc to before 016bc663657366d386993f63eb31072eb45a2b77Affected
4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc to before 8f2be7285941a33a9f72579a23b96392f83c758eAffected
4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc to before 5199c125d25aeae8615c4fc31652cc0fe624338eAffected

LinuxLinux

2.6.34Affected
before 2.6.34Not affected
5.15.209 through 5.15.*Not affected
6.1.175 through 6.1.*Not affected
6.6.140 through 6.6.*Not affected
6.12.86 through 6.12.*Not affected
6.18.27 through 6.18.*Not affected
7.0.4 through 7.0.*Not affected
7.1 and laterNot affected

References

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