CVE-2022-42917
frr: FRRouting FRR: Privilege escalation via TOCTOU race condition
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 13, 2026
Updated · September 14, 2026
Description
A flaw was found in FRRouting FRR. A local service user can exploit a Time-of-check to time-of-use (TOCTOU) race condition by monitoring the configuration directory and replacing configuration files with symbolic links during their creation. This manipulation allows the user to change the ownership of arbitrary files. This can lead to privilege escalation, allowing the service user to gain root privileges.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
CVSS / CWE
CVSS 3.1 · 6.7CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition