7.5

CVE-2021-47241: ethtool: strset: fix message length calculation

Analyzed
AliasesUBUNTU-CVE-2021-47241DEBIAN-CVE-2021-47241
Published 21-05-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-47241 is a high (CVSS 7.5) Incorrect Privilege Assignment vulnerability in linux. EPSS estimates a 1.03% chance of exploitation in the next 30 days, higher than 63.7% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
1.03%
0%100%
Low · +0.01 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 2 · Related 2
SUSE-SU-2024:2010-1SUSE-SU-2024:2185-1

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: ethtool: strset: fix message length calculation Outer nest for ETHTOOL_A_STRSET_STRINGSETS is not accounted for. This may result in ETHTOOL_MSG_STRSET_GET producing a warning like: calculated message payload length (684) not sufficient WARNING: CPU: 0 PID: 30967 at net/ethtool/netlink.c:369 ethnl_default_doit+0x87a/0xa20 and a splat. As usually with such warnings three conditions must be met for the warning to trigger: - there must be no skb size rounding up (e.g. reply_size of 684); - string set must be per-device (so that the header gets populated); - the device name must be at least 12 characters long. all in all with current user space it looks like reading priv flags is the only place this could potentially happen. Or with syzbot :)

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

1.03%

Chance of exploitation in the next 30 days

Percentile

64%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 1.02% 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

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu62 products
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
  • linux-aws-5.13All versions (No fix recorded)
  • linux-aws-5.19All versions (No fix recorded)
Linux2 products
  • linux≥ 71921690f9745fef60a2bad425f30adf8cdc9da0, < fb3a948143688e14e2cfd2a2812877923d0e5e92 | ≥ 71921690f9745fef60a2bad425f30adf8cdc9da0, < cfc7f0e70d649e6d2233fba0d9390b525677d971 | ≥ 71921690f9745fef60a2bad425f30adf8cdc9da0, < e175aef902697826d344ce3a12189329848fe898 | 5.6
  • linux_kernel≥ 5.6, < 5.10.46 | ≥ 5.11, < 5.12.13 | 5.13:rc1 | 5.13:rc2 | 5.13:rc3 | 5.13:rc4 | 5.13:rc5 | 5.13:rc6
Debian1 product
  • linux< 5.10.46-1

3 vendors · 65 products

References

7 links