PT-2026-43891 · Linux · Linux

Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-46024

Mitre

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Fix

Related Identifiers

CVE-2026-46024

Affected Products

Linux

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-46024 · Security Note
• https://git.kernel.org/stable/c/4b2738b93edad661178340239de657d876b73d3d · Note
• https://git.kernel.org/stable/c/5199c125d25aeae8615c4fc31652cc0fe624338e · Note
• https://git.kernel.org/stable/c/8f2be7285941a33a9f72579a23b96392f83c758e · Note
• https://git.kernel.org/stable/c/927e4bd5692f2a4901808822981fb2c8d4456548 · Note
• https://git.kernel.org/stable/c/016bc663657366d386993f63eb31072eb45a2b77 · Note