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redhatcveRedhat.comRH:CVE-2021-47293
HistoryMay 23, 2024 - 1:31 p.m.

CVE-2021-47293

2024-05-2313:31:38
redhat.com
access.redhat.com
3
linux kernel
vulnerability
skbmod
ethernet packets
mitigation

6.7 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

15.5%

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.

6.7 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

15.5%