In FRRouting FRR before 8.5, the service user (usually frr) can escalate its privileges to root by monitoring the configuration directory (/etc/frr) and replacing config files upon creation with, for example, symlinks to change the ownership of arbitrary files. This is a TOCTOU Race Condition caused by a combination of touch and chown.
Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 14 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
Title frr: FRRouting FRR: Privilege escalation via TOCTOU race condition
References
Metrics threat_severity

None

threat_severity

Moderate


Sun, 13 Sep 2026 23:45:00 +0000

Type Values Removed Values Added
First Time appeared Frrouting
Frrouting frrouting
Weaknesses CWE-367
CPEs cpe:2.3:a:frrouting:frrouting:*:*:*:*:*:*:*:*
Vendors & Products Frrouting
Frrouting frrouting
Metrics cvssV3_1

{'score': 6.7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H'}


Sun, 13 Sep 2026 23:30:00 +0000

Type Values Removed Values Added
Description In FRRouting FRR before 8.5, the service user (usually frr) can escalate its privileges to root by monitoring the configuration directory (/etc/frr) and replacing config files upon creation with, for example, symlinks to change the ownership of arbitrary files. This is a TOCTOU Race Condition caused by a combination of touch and chown.
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-09-14T18:15:19.986Z

Reserved: 2022-10-13T00:00:00.000Z

Link: CVE-2022-42917

cve-icon Vulnrichment

Updated: 2026-09-14T15:03:59.389Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-14T00:16:55.700

Modified: 2026-09-22T19:56:19.073

Link: CVE-2022-42917

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-13T00:00:00Z

Links: CVE-2022-42917 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-15T18:30:14Z

Weaknesses