# CVE-2022-42917: CVE-2022-42917

Status: published. Published: 2026-09-14. Updated: 2026-11-10.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

Not reported in collected sources.

## Severity and prioritization

- CVSS 3.1: 6.7 (medium); CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H; source: NVD: cve@mitre.org

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation none; automatable no; technical impact total; source NVD SSVC: 134c704f-9b21-4f2e-91b3-4a467353bcc0

- Weaknesses: CWE-367

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://bugzilla.suse.com/show_bug.cgi?id=1204124 (cve@mitre.org)

- https://frrouting.org/security/cve-2022-42917/ (cve@mitre.org)

- https://github.com/FRRouting/frr/commit/972cdc560e339d70c0ee5fb70ec636ab78f00bca (cve@mitre.org)

- https://github.com/FRRouting/frr/compare/frr-8.4...frr-8.5 (cve@mitre.org)

## Provenance

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-42917; retrieved 2026-11-10; source updated 2026-11-10

Revision: 5babf786bdac4db18259d85e64f40b68f7a7c4e429c67d596fbf6607e124e6ec

Canonical: https://y2.dev/cve/CVE-2022-42917

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Collected public records only. Check source status for coverage and freshness.