# CVE-2021-47293: linux: In the Linux kernel, the following vulnerability has been resolved:  net/sched: act_skbmod: Skip non-Ethernet packets...

CVE-2021-47293 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47293, released May 21, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-47293
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.6-1 | [DEBIAN-CVE-2021-47293](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47293.md) | May 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.14.6-1 | [DEBIAN-CVE-2021-47293](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47293.md) | May 21, 2024 |
| Linux | linux Debian 14 | 5.14.6-1 | [DEBIAN-CVE-2021-47293](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47293.md) | May 21, 2024 |

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