# CVE-2022-42917: frr: In FRRouting FRR before 8.5, the service user (usually frr) can escalate its privileges to root by monitoring the con...

CVE-2022-42917 is fixed in frr on 1 platform, first by DEBIAN-CVE-2022-42917, released September 17, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-42917
- Priority: Routine
- CVSS: 6.7 (medium)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 14, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | frr Debian 12.15 (bookworm) | 8.4.1-1 | [DEBIAN-CVE-2022-42917](https://patchblox.com/security/data/fix/linux/debian-cve-2022-42917.md) | Sep 17, 2026 |
| Linux | frr Debian 13.5 (trixie) | 8.4.1-1 | [DEBIAN-CVE-2022-42917](https://patchblox.com/security/data/fix/linux/debian-cve-2022-42917.md) | Sep 17, 2026 |
| Linux | frr Debian 14 | 8.4.1-1 | [DEBIAN-CVE-2022-42917](https://patchblox.com/security/data/fix/linux/debian-cve-2022-42917.md) | Sep 17, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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