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 products
linux: linux kernel
References7
- git.kernel.org/stable/c/2b055c719d8f94c15ec9b7659978133030c6a353 Patch
- git.kernel.org/stable/c/650137a7c0b2892df2e5b0bc112d7b09a78c93c8 Patch
- git.kernel.org/stable/c/a62aa84fe19eb24d083d600a074c009a0a66d4f3 Patch
- git.kernel.org/stable/c/b64085b00044bdf3cd1c9825e9ef5b2e0feae91a Patch
- git.kernel.org/stable/c/d2fee7d121d189c6dc905b727d60e7043a6655bb Patch
- git.kernel.org/stable/c/e41cbf98df22d08402e65174d147cbb187fe1a33 Patch
- git.kernel.org/stable/c/e929ec98c0c3b10d9c07f3776df0c1a02d7a763e Patch
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 12 · as of 7 November 2026
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.