CVE-2026-43619
Description
A flaw was found in rsync. A local attacker with filesystem access on the daemon host can exploit a symlink race vulnerability (CWE-367 Time-of-check to time-of-use) in rsync daemons configured with 'use chroot = no'. This allows the attacker to redirect path-based system calls, such as chmod, lchown, or unlink, outside the intended module. This could lead to unauthorized file operations or other security bypasses.
Statement
Moderate: A symlink race vulnerability affects rsync daemons when configured with use chroot = no, allowing a local attacker with filesystem access to perform unauthorized file operations outside the intended module. This risk is present only when the non-default use chroot = no setting is active.
Mitigation
To mitigate this issue, ensure that the `rsync` daemon is configured with `use chroot = yes`. This can be achieved by editing the `rsyncd.conf` file, typically located at `/etc/rsyncd.conf`, and setting `use chroot = yes` within the relevant module configuration. After modifying the configuration, the `rsync` service must be restarted for the changes to take effect. This may temporarily interrupt active `rsync` operations.
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 | Low | N/A | High |
| Privileges Required | High | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | Low | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L
cve.org: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/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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