---
id: CVE-2022-49776
title: 'macvlan: enforce a consistent minimal mtu'
summary: |-
  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 …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 91572088e3fdbf4fe31cf397926d8b890fdb3237 <
    d2fee7d121d189c6dc905b727d60e7043a6655bb
  - >-
    Linux >= 91572088e3fdbf4fe31cf397926d8b890fdb3237 <
    650137a7c0b2892df2e5b0bc112d7b09a78c93c8
  - >-
    Linux >= 91572088e3fdbf4fe31cf397926d8b890fdb3237 <
    a62aa84fe19eb24d083d600a074c009a0a66d4f3
  - >-
    Linux >= 91572088e3fdbf4fe31cf397926d8b890fdb3237 <
    e929ec98c0c3b10d9c07f3776df0c1a02d7a763e
  - >-
    Linux >= 91572088e3fdbf4fe31cf397926d8b890fdb3237 <
    e41cbf98df22d08402e65174d147cbb187fe1a33
  - >-
    Linux >= 91572088e3fdbf4fe31cf397926d8b890fdb3237 <
    2b055c719d8f94c15ec9b7659978133030c6a353
  - >-
    Linux >= 91572088e3fdbf4fe31cf397926d8b890fdb3237 <
    b64085b00044bdf3cd1c9825e9ef5b2e0feae91a
  - Linux 4.10
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T19:47:27.116715Z'
published: '2025-05-01'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T19:49:43.688Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-49776'
references:
  - url: 'https://git.kernel.org/stable/c/d2fee7d121d189c6dc905b727d60e7043a6655bb'
  - url: 'https://git.kernel.org/stable/c/650137a7c0b2892df2e5b0bc112d7b09a78c93c8'
  - url: 'https://git.kernel.org/stable/c/a62aa84fe19eb24d083d600a074c009a0a66d4f3'
  - url: 'https://git.kernel.org/stable/c/e929ec98c0c3b10d9c07f3776df0c1a02d7a763e'
  - url: 'https://git.kernel.org/stable/c/e41cbf98df22d08402e65174d147cbb187fe1a33'
  - url: 'https://git.kernel.org/stable/c/2b055c719d8f94c15ec9b7659978133030c6a353'
  - url: 'https://git.kernel.org/stable/c/b64085b00044bdf3cd1c9825e9ef5b2e0feae91a'
tags:
  - cve.org
epss: 0.00218
epssPercentile: 0.12322
ingestedAt: '2026-11-05T22:38:31.589Z'
---

## Overview

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

- `Linux >= 91572088e3fdbf4fe31cf397926d8b890fdb3237 < d2fee7d121d189c6dc905b727d60e7043a6655bb`
- `Linux >= 91572088e3fdbf4fe31cf397926d8b890fdb3237 < 650137a7c0b2892df2e5b0bc112d7b09a78c93c8`
- `Linux >= 91572088e3fdbf4fe31cf397926d8b890fdb3237 < a62aa84fe19eb24d083d600a074c009a0a66d4f3`
- `Linux >= 91572088e3fdbf4fe31cf397926d8b890fdb3237 < e929ec98c0c3b10d9c07f3776df0c1a02d7a763e`
- `Linux >= 91572088e3fdbf4fe31cf397926d8b890fdb3237 < e41cbf98df22d08402e65174d147cbb187fe1a33`
- `Linux >= 91572088e3fdbf4fe31cf397926d8b890fdb3237 < 2b055c719d8f94c15ec9b7659978133030c6a353`
- `Linux >= 91572088e3fdbf4fe31cf397926d8b890fdb3237 < b64085b00044bdf3cd1c9825e9ef5b2e0feae91a`
- `Linux 4.10`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.