CVE-2026-22992 libceph: return the handler error from mon_handle_auth_done()

What is CVE-2026-22992?

CVE-2026-22992 is a high-severity vulnerability in Linux kernel, published on 23 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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().

Weakness: CWE-476, CWE-754

Which versions are affected by CVE-2026-22992?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-22992?

Apply the vendor's patch.

Is CVE-2026-22992 being exploited?

There is no known exploitation of CVE-2026-22992 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-78473, BELL-CVE-2026-22992, DEBIAN-CVE-2026-22992, GHSA-3fqc-v7hh-4m8x, ROOT-OS-DEBIAN-12-CVE-2026-22992, ROOT-OS-DEBIAN-13-CVE-2026-22992 and 3 more.