CVE-2026-92503
Description
A flaw was found in ext4, the extended filesystem for the Linux kernel. When concurrent extended attribute (xattr) workloads are processed, an ABBA deadlock can occur between a running transaction and the eviction thread. This situation causes both tasks to wait indefinitely for each other, leading to system unresponsiveness or a hang. A local attacker could exploit this to cause a Denial of Service (DoS).
Statement
This vulnerability is rated as having a Moderate impact because exploitation is constrained to local access and results in a denial of service without affecting system confidentiality or data integrity. While XFS is the default filesystem across modern Red Hat Enterprise Linux releases, ext4 remains supported and susceptible when formatted or mounted with the ea_inode feature enabled. Triggering the deadlock requires an unprivileged local user to induce heavy concurrent extended attribute transactions and inode evictions.
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
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