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osvGoogleOSV:CVE-2021-47293
HistoryMay 21, 2024 - 3:15 p.m.

CVE-2021-47293

2024-05-2115:15:00
Google
osv.dev
8
linux kernel
vulnerability
cve-2021-47293
net/sched
act_skbmod
ethernet protocol
skbmod action

AI Score

6.8

Confidence

Low

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.