CVE-2022-49776

macvlan: enforce a consistent minimal mtu

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.

N/A

CVSS

Severity:

EPSS 0.03%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/d2fee7d121d189c6dc905b727d60e7043a6655bb
https://git.kernel.org/stable/c/650137a7c0b2892df2e5b0bc112d7b09a78c93c8
https://git.kernel.org/stable/c/a62aa84fe19eb24d083d600a074c009a0a66d4f3
https://git.kernel.org/stable/c/e929ec98c0c3b10d9c07f3776df0c1a02d7a763e
https://git.kernel.org/stable/c/e41cbf98df22d08402e65174d147cbb187fe1a33
https://git.kernel.org/stable/c/2b055c719d8f94c15ec9b7659978133030c6a353
https://git.kernel.org/stable/c/b64085b00044bdf3cd1c9825e9ef5b2e0feae91a

Frequently Asked Questions

What is the severity of CVE-2022-49776?: CVE-2022-49776 has not yet been assigned a CVSS score.
How to fix CVE-2022-49776?: To fix CVE-2022-49776, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-49776 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-49776 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-49776?: CVE-2022-49776 affects Linux Linux, Linux Linux.

This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.