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CVE-2022-49776

5.5 · MEDIUM

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.

Published May 1, 2025EPSS 0.22%

Overview

CVE-2022-49776 is a medium-severity vulnerability. It was published on May 1, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/2b055c719d8f94c15ec9b7659978133030c6a353Refgit.kernel.org/stable/c/650137a7c0b2892df2e5b0bc112d7b09a78c93c8Refgit.kernel.org/stable/c/a62aa84fe19eb24d083d600a074c009a0a66d4f3Refgit.kernel.org/stable/c/b64085b00044bdf3cd1c9825e9ef5b2e0feae91aRefgit.kernel.org/stable/c/d2fee7d121d189c6dc905b727d60e7043a6655bbRefgit.kernel.org/stable/c/e41cbf98df22d08402e65174d147cbb187fe1a33Refgit.kernel.org/stable/c/e929ec98c0c3b10d9c07f3776df0c1a02d7a763e

How CyberStrike helps

Frequently asked questions

What is CVE-2022-49776?

CVE-2022-49776 is a medium-severity vulnerability. It was published on May 1, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-49776?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-49776?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-49776?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-49776 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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