CVE-2021-47293

medium

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: act_skbmod: Skip non-Ethernet packets Currently tcf_skbmod_act() assumes that packets use Ethernet as their L2 protocol, which is not always the case. As an example, for CAN devices: $ ip link add dev vcan0 type vcan $ ip link set up vcan0 $ tc qdisc add dev vcan0 root handle 1: htb $ tc filter add dev vcan0 parent 1: protocol ip prio 10 \ matchall action skbmod swap mac Doing the above silently corrupts all the packets. Do not perform skbmod actions for non-Ethernet packets.

References

https://git.kernel.org/stable/c/e4fdca366806f6bab374d1a95e626a10a3854b0c

https://git.kernel.org/stable/c/a88414fb1117f2fe65fb88e45ba694e1d09d5024

https://git.kernel.org/stable/c/727d6a8b7ef3d25080fad228b2c4a1d4da5999c6

https://git.kernel.org/stable/c/34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d

https://git.kernel.org/stable/c/071729150be9e1d1b851b70efb6d91ee9269d57b

Details

Source: Mitre, NVD

Published: 2024-05-21

Updated: 2024-05-21

Risk Information

CVSS v2

Base Score: 5.5

Vector: CVSS2#AV:L/AC:L/Au:M/C:P/I:P/A:C

Severity: Medium

CVSS v3

Base Score: 4.2

Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L

Severity: Medium