CVE-2026-22990 libceph: replace overzealous BUG_ON in osdmap_apply_incremental()

What is CVE-2026-22990?

CVE-2026-22990 is a high-severity denial of service 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: replace overzealous BUG_ON in osdmap_apply_incremental()

If the osdmap is (maliciously) corrupted such that the incremental osdmap epoch is different from what is expected, there is no need to BUG. Instead, just declare the incremental osdmap to be invalid.

Weakness: CWE-617, CWE-400

Which versions are affected by CVE-2026-22990?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-22990?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-22990 being exploited?

There is no known exploitation of CVE-2026-22990 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-78467, BELL-CVE-2026-22990, DEBIAN-CVE-2026-22990, GHSA-ff5w-pjxm-v3rr, ROOT-OS-DEBIAN-11-CVE-2026-22990, ROOT-OS-DEBIAN-12-CVE-2026-22990 and 4 more.