7.8

CVE-2021-47293: net/sched: act_skbmod: Skip non-Ethernet packets

Analyzed
AliasesUBUNTU-CVE-2021-47293DEBIAN-CVE-2021-47293
Published 21-05-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-47293 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 14.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.23%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 3
RHSA-2024:4447SUSE-SU-2024:2360-1SUSE-SU-2024:2381-1SUSE-SU-2024:2561-1

Timeline

  1. 21-05-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.23% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu86 products
  • linuxAll versions (No fix recorded) | < 5.4.0-88.99
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1057.60
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 86da71b57383d40993cb90baafb3735cffe5d800, < e4fdca366806f6bab374d1a95e626a10a3854b0c | ≥ 86da71b57383d40993cb90baafb3735cffe5d800, < a88414fb1117f2fe65fb88e45ba694e1d09d5024 | ≥ 86da71b57383d40993cb90baafb3735cffe5d800, < 071729150be9e1d1b851b70efb6d91ee9269d57b | ≥ 86da71b57383d40993cb90baafb3735cffe5d800, < 34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d | ≥ 86da71b57383d40993cb90baafb3735cffe5d800, < 727d6a8b7ef3d25080fad228b2c4a1d4da5999c6 | 4.9
  • linux_kernel≥ 4.9, < 4.19.199 | ≥ 4.20, < 5.4.136 | ≥ 5.5, < 5.10.54 | ≥ 5.11, < 5.13.6 | 5.14:rc1 | 5.14:rc2
Debian1 product
  • linux< 5.14.6-1

3 vendors · 89 products

References

9 links