CVE-2026-46024

A flaw was found in the Linux kernel's libceph component. A remote attacker could send a specially crafted authentication reply message to trigger a null pointer dereference. This vulnerability can lead to a system crash, resulting in a Denial of Service (DoS) for affected systems.

This Moderate flaw in the Linux kernel's libceph component could allow a remote attacker on an adjacent network with low privileges to trigger a null pointer dereference. By sending a specially crafted authentication reply message, an attacker can cause a system crash, leading to a Denial of Service. This impact is limited to systems where the libceph module is actively used and exposed to an untrusted adjacent network, as Ceph services are not typically exposed to the broader internet.

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 reduce exposure, systems not utilizing Ceph storage can prevent the ceph kernel module from loading. Create a file /etc/modprobe.d/disable-ceph.conf with the line blacklist ceph. A system reboot is required for this change to take effect. For systems where Ceph is in use, restrict network access to Ceph services to trusted networks and clients through firewall configurations. This may impact functionality if Ceph services are required from untrusted networks.