CVE-2026-43420

A flaw was found in the Linux kernel's Ceph file system client. A race condition during asynchronous file unlink operations can lead to an i_nlink counter underrun. This vulnerability allows an attacker to trigger a kernel warning, potentially causing system instability and a Denial of Service (DoS).

Red Hat acknowledges the upstream Linux kernel correction for «ceph» as described in COMMENT_ZERO. Fixes are delivered through standard kernel errata for supported products. Operational exposure depends on whether this subsystem or driver is active in your configuration.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, prevent the ceph module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.