CVE-2022-49776

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 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 Software

VendorProductVersion RangeStatus
LinuxLinux91572088e3fdbf4fe31cf397926d8b890fdb3237 < d2fee7d121d189c6dc905b727d60e7043a6655bbaffected
LinuxLinux91572088e3fdbf4fe31cf397926d8b890fdb3237 < 650137a7c0b2892df2e5b0bc112d7b09a78c93c8affected
LinuxLinux91572088e3fdbf4fe31cf397926d8b890fdb3237 < a62aa84fe19eb24d083d600a074c009a0a66d4f3affected
LinuxLinux91572088e3fdbf4fe31cf397926d8b890fdb3237 < e929ec98c0c3b10d9c07f3776df0c1a02d7a763eaffected
LinuxLinux91572088e3fdbf4fe31cf397926d8b890fdb3237 < e41cbf98df22d08402e65174d147cbb187fe1a33affected
LinuxLinux91572088e3fdbf4fe31cf397926d8b890fdb3237 < 2b055c719d8f94c15ec9b7659978133030c6a353affected
LinuxLinux91572088e3fdbf4fe31cf397926d8b890fdb3237 < b64085b00044bdf3cd1c9825e9ef5b2e0feae91aaffected
LinuxLinux4.10affected
LinuxLinux0 < 4.10unaffected
LinuxLinux4.14.300 <= 4.14.*unaffected
LinuxLinux4.19.267 <= 4.19.*unaffected
LinuxLinux5.4.225 <= 5.4.*unaffected
LinuxLinux5.10.156 <= 5.10.*unaffected
LinuxLinux5.15.80 <= 5.15.*unaffected
LinuxLinux6.0.10 <= 6.0.*unaffected
LinuxLinux6.1 <= *unaffected

Weaknesses

References