5.5

CVE-2021-47294: linux

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2021-47294DEBIAN-CVE-2021-47294
Published 21-05-2024Last modified 23-05-2026
Open JSON

Vulnerability summary

CVE-2021-47294 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 18.8% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.28%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 5 · Related 5
SUSE-SU-2024:2360-1SUSE-SU-2024:2381-1SUSE-SU-2024:2561-1USN-7863-1USN-7865-1

Timeline

  1. 21-05-2024
    PublishedVulnerability first disclosed.
  2. 23-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: netrom: Decrease sock refcount when sock timers expire Commit 63346650c1a9 ("netrom: switch to sock timer API") switched to use sock timer API. It replaces mod_timer() by sk_reset_timer(), and del_timer() by sk_stop_timer(). Function sk_reset_timer() will increase the refcount of sock if it is called on an inactive timer, hence, in case the timer expires, we need to decrease the refcount ourselves in the handler, otherwise, the sock refcount will be unbalanced and the sock will never be freed.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

19%

Versus all other CVEs

30-day change

0.00 pp

From 0.28% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.28%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu87 products
  • linux< 4.4.0-274.308 | < 4.15.0-159.167 | < 5.4.0-88.99
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1149.155 | < 4.4.0-1187.202 | < 4.15.0-1112.119 | < 5.4.0-1057.60
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ ce29e8a259de767f7210d346ad2b031cb8ab2732, < 853262355518cd1247515b74e83fabf038aa6c29 | ≥ baa9e32336bf6d0d74a7c3486d2a27feaf57cd5f, < a01634bf91f2b6c42583770eb6815fb6d1e251cf | ≥ 0adf571fa34b27bd0b97b408cc0f0dc54b72f0eb, < 48866fd5c361ea417ed24b43fc2a7dc2f5b060ef | ≥ 2c6b572458a9127e8070df13fa7f115c29ab1d92, < 9619cc7d97c3aa8ed3cfd2b8678b74fb6d6c7950 | ≥ 63346650c1a94a92be61a57416ac88c0a47c4327, < 25df44e90ff5959b5c24ad361b648504a7e39ef3 | ≥ 63346650c1a94a92be61a57416ac88c0a47c4327, < 6811744bd0efb9e472cb15d066cdb460beb8cb8a | ≥ 63346650c1a94a92be61a57416ac88c0a47c4327, < bc1660206c3723c37ed4d622ad81781f1e987250 | ≥ 63346650c1a94a92be61a57416ac88c0a47c4327, < 517a16b1a88bdb6b530f48d5d153478b2552d9a8 | f1d9a1f2ef6ff17293d21d5e6b80e04bea0cf508 | 519e8a22a454b1f1baa3a151b184fe51bc18e178 | ≥ 4.4.173, < 4.4.277 | ≥ 4.9.155, < 4.9.277 | ≥ 4.14.98, < 4.14.241 | ≥ 4.19.20, < 4.19.199 | ≥ 3.18.134, < 3.19 | ≥ 4.20.7, < 4.21 | 5.0
  • linux_kernel≥ 4.4.173, < 4.4.277 | ≥ 4.9.155, < 4.9.277 | ≥ 4.14.98, < 4.14.241 | ≥ 4.19.20, < 4.19.199 | ≥ 5.0, < 5.4.136 | ≥ 5.5, < 5.10.54 | ≥ 5.11, < 5.13.6 | 3.18.134 | 4.20.7 | 5.14:rc1 | 5.14:rc2
Debian1 product
  • linux< 5.14.6-1

3 vendors · 90 products

References

14 links
Show all 14 references