CVE-2026-46024
Description
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.
Statement
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.
Mitigation
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.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.7 | N/A | 7.5 |
| Attack Vector | Adjacent Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Other
Technical Impact: Varies by Context
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