CVE-2026-43407

A flaw was found in the libceph component of the Linux kernel. A remote attacker could send a specially crafted CEPH_MSG_AUTH_REPLY message with a large payload_len value. This could lead to an integer overflow, causing an out-of-bounds memory access. This vulnerability could result in memory corruption, potentially leading to a denial of service or other unpredictable system behavior.

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.