CVE-2026-112911
Description
A flaw was found in filelock. This vulnerability allows a local attacker to manipulate lock state by pre-creating a protocol directory within a shared parent directory. When filelock adopts this untrusted directory, the attacker can alter the protocol state and admit unauthorized concurrent lock holders. This behavior bypasses mutual exclusion protections, potentially leading to concurrent access and data corruption.
Statement
This vulnerability is rated as Moderate impact because successful exploitation requires an unprivileged local attacker to pre-create directory structures in a shared, world-writable location before the victim process initializes the lock. In standard Red Hat environments, workloads operating within isolated container filesystems or using dedicated, user-restricted directories are not exposed to this flaw. Impact is limited to multi-user systems where tasks place file locks in shared temporary locations like /tmp, potentially allowing a local actor to bypass mutual exclusion and induce race conditions.
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 | 6.3 | N/A | 6.3 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | High | N/A | High |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | High | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
cve.org: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (Other)
When an attacker can control a lock, the program may wait indefinitely until the attacker releases the lock, causing a denial of service to other users of the program. This is especially problematic if there is a blocking operation on the lock.
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