# CVE-2022-49654: linux: In the Linux kernel, the following vulnerability has been resolved:  net: dsa: qca8k: reset cpu port on MTU change  I...

CVE-2022-49654 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49654, released February 26, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49654
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: dsa: qca8k: reset cpu port on MTU change  It was discovered that the Documentation lacks of a fundamental detail on how to correctly change the MAX_FRAME_SIZE of the switch.  In fact if the MAX_FRAME_SIZE is changed while the cpu port is on, the switch panics and cease to send any packet. This cause the mgmt ethernet system to not receive any packet (the slow fallback still works) and makes the device not reachable. To recover from this a switch reset is required.  To correctly handle this, turn off the cpu ports before changing the MAX_FRAME_SIZE and turn on again after the value is applied.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.18.14-1 | [DEBIAN-CVE-2022-49654](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49654.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.18.14-1 | [DEBIAN-CVE-2022-49654](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49654.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.18.14-1 | [DEBIAN-CVE-2022-49654](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49654.md) | Feb 26, 2025 |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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