CVE-2026-43406

A flaw was found in libceph in the Linux kernel. A remote attacker could exploit this vulnerability by sending a maliciously crafted message frame. This manipulation, either by corrupting the control segment length or disguising a different frame as a message frame, can cause out-of-bounds reads during message header processing. Such an issue may lead to information disclosure or system instability.

Red Hat acknowledges the upstream Linux kernel correction for «libceph» 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.