CVE-2026-68158
Description
A flaw was found in libceph within the Linux kernel. A remote attacker could send a maliciously crafted CEPH_MSG_OSD_MAP message, leading to a multiplication overflow in the decode_new_up_state_weight() function. This overflow causes an incorrect bounds check, which may result in out-of-bounds memory reads. This could potentially lead to information disclosure or system instability.
Statement
This flaw is rated as Moderate impact for Red Hat Enterprise Linux because exploitation requires an active connection to an untrusted or compromised Ceph storage cluster to deliver corrupted cluster map frames. The underlying libceph driver is not loaded by default on standard deployments and is only engaged when systems mount CephFS filesystems or map RBD volumes. Consequently, the blast radius is constrained to hosts utilizing kernel Ceph clients on untrusted networks, where an attack could induce a kernel panic or expose uninitialized memory.
Mitigation
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
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 | 7.5 | N/A | 9.8 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | High |
| Integrity Impact | None | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/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:H/I:H/A:H
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
