Tracker / CVE-2021-47293
CVE-2021-47293
High 7.8
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.
Affected products and versions
| linux | linux_kernel |
|---|---|
| linux | linux_kernel · 4.20 → 5.4.136 |
| linux | linux_kernel · 4.9 → 4.19.199 |
| linux | linux_kernel · 5.11 → 5.13.6 |
| linux | linux_kernel · 5.5 → 5.10.54 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.