CVE-2026-68150
Description
A flaw was found in the Linux kernel. A local attacker could trigger a double-unlock vulnerability in the filesystem's emergency thaw operation. This occurs when the s_umount semaphore is released twice, leading to corruption of the semaphore's internal state. This corruption can cause system instability or a kernel crash, resulting in a denial of service.
Statement
This issue affects filesystem emergency thaw operations. do_thaw_all_callback() calls thaw_super_locked() which releases s_umount, but __iterate_supers() also unlocks it, causing double-unlock and semaphore corruption. Requires privileges to trigger emergency thaw.
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 | 5.5 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability,Integrity
Technical Impact: DoS: Crash, Exit, or Restart; Modify Memory; Unexpected State
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
