CVE-2022-49776

macvlan: enforce a consistent minimal mtu

MEDIUM

5.5

CVSS Score

Published: May 1, 2025 at 02:09 PM UTC

Updated: June 17, 2026 at 05:19 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

4.10 ≤ v < 4.14.3004.10 ≤ v < 4.19.2674.10 ≤ v < 5.10.1564.10 ≤ v < 5.15.804.10 ≤ v < 5.4.2254.10 ≤ v < 6.0.104.10 ≤ v < 6.14.15 ≤ v < 4.19.2674.20 ≤ v < 5.4.2255.11 ≤ v < 5.15.805.16 ≤ v < 6.0.105.5 ≤ v < 5.10.1564.1091572088e3fdbf4fe31cf397926d8b890fdb3237

Vendor states this is fixed in 2b055c719d8f94c15ec9b7659978133030c6a353 (fixed)

Vendor states this is fixed in 650137a7c0b2892df2e5b0bc112d7b09a78c93c8 (fixed)

Vendor states this is fixed in a62aa84fe19eb24d083d600a074c009a0a66d4f3 (fixed)

Vendor states this is fixed in b64085b00044bdf3cd1c9825e9ef5b2e0feae91a (fixed)

Vendor states this is fixed in d2fee7d121d189c6dc905b727d60e7043a6655bb (fixed)

Vendor states this is fixed in e41cbf98df22d08402e65174d147cbb187fe1a33 (fixed)

Vendor states this is fixed in e929ec98c0c3b10d9c07f3776df0c1a02d7a763e (fixed)

Vendor states this is fixed in 4.10 (unaffected)

Vendor states this is fixed in 4.14.300 (unaffected)

Vendor states this is fixed in 4.19.267 (unaffected)

Vendor states this is fixed in 5.10.156 (unaffected)

Vendor states this is fixed in 5.15.80 (unaffected)