CVE-2022-49776: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: from 4.10, before 4.14.300 (fixed in 4.14.300); from 4.15, before 4.19.267 (fixed in 4.19.267); from 4.20, before 5.4.225 (fixed in 5.4.225); from 5.5, before 5.10.156 (fixed in 5.10.156); from 5.11, before 5.15.80 (fixed in 5.15.80); from 5.16, before 6.0.10 (fixed in 6.0.10)

Published 2025-05-01. Last modified 2026-06-17.