# CVE-2022-49776: linux: In the Linux kernel, the following vulnerability has been resolved:  macvlan: enforce a consistent minimal mtu  macvl...

CVE-2022-49776 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49776, released May 1, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49776
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  macvlan: enforce a consistent minimal mtu  macvlan should enforce a minimal mtu of 68, even at link creation.  This patch avoids the current behavior (which could lead to crashes in ipv6 stack if the link is brought up)  $ ip link add macvlan1 link eno1 mtu 8 type macvlan  # This should fail ! $ ip link sh dev macvlan1 5: macvlan1@eno1: <BROADCAST,MULTICAST> mtu 8 qdisc noop     state DOWN mode DEFAULT group default qlen 1000     link/ether 02:47:6c:24:74:82 brd ff:ff:ff:ff:ff:ff $ ip link set macvlan1 mtu 67 Error: mtu less than device minimum. $ ip link set macvlan1 mtu 68 $ ip link set macvlan1 mtu 8 Error: mtu less than device minimum.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.10-1 | [DEBIAN-CVE-2022-49776](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49776.md) | May 1, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.10-1 | [DEBIAN-CVE-2022-49776](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49776.md) | May 1, 2025 |
| Linux | linux Debian 14 | 6.0.10-1 | [DEBIAN-CVE-2022-49776](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49776.md) | May 1, 2025 |

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