CVE-2026-112914
Description
A flaw was found in filelock. A local attacker with write access to a shared lock directory can exploit the SoftFileLock mechanism to cause unauthorized file exposure. When filelock restores a stale lock marker by name, the attacker can swap in a symbolic link, causing the victim's process to create a hard link to its own files inside the shared directory. This allows unauthorized local users to access or modify sensitive files on the same filesystem.
Statement
This vulnerability is rated as Moderate impact because exploitation requires local unprivileged access, precise timing to win multiple file system race conditions, and a shared lock directory lacking the sticky bit. In standard Red Hat Enterprise Linux environments and container deployments, shared temporary directories like /tmp have the sticky bit enabled by default, mitigating this flaw. Additionally, typical applications maintain file locks in user-specific private paths rather than world-writable non-sticky locations, substantially limiting real-world exposure.
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 | 5.3 | N/A | 5.3 |
| 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 | Low | N/A | Low |
| Integrity Impact | High | N/A | High |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
cve.org: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
Understanding the Weakness (CWE)
Confidentiality,Integrity,Access Control
Technical Impact: Read Files or Directories; Modify Files or Directories; Bypass Protection Mechanism
An attacker may be able to traverse the file system to unintended locations and read or overwrite the contents of unexpected files. If the files are used for a security mechanism then an attacker may be able to bypass the mechanism.
Other
Technical Impact: Execute Unauthorized Code or Commands
Windows simple shortcuts, sometimes referred to as soft links, can be exploited remotely since a ".LNK" file can be uploaded like a normal file. This can enable remote execution.
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