Skip to main content
No exploitation reportedFix available

CVE-2021-47295

No exploitation reported by the sources we read.

  • Published2024-05-21
  • Fixed inf5051bcece50 · cac71d27745f · 8d7924ce85ba · 8e9662fde6d6 · 5.13.6 · 5.10.54
  • WeaknessCWE-400

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In the Linux kernel, the following vulnerability has been resolved: net: sched: fix memory leak in tcindex_partial_destroy_work Syzbot reported memory leak in tcindex_set_parms(). The problem was in non-freed perfect hash in tcindex_partial_destroy_work(). In tcindex_set_parms() new tcindex_data is allocated and some fields from old one are copied to new one, but not the perfect hash. Since tcindex_partial_destroy_work() is the destroy function for old tcindex_data, we need to free perfect hash to avoid memory leak.

Timeline

dates in UTC
  1. 2024-05-2115:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-47295?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-47295?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

CISA-ADP · NVD
Linux linux kernel
BranchAffectedFixed in
331+≥ 331b72922c5f, < f5051bcece50f5051bcece50
331+≥ 331b72922c5f, < cac71d27745fcac71d27745f
8.x≥ 331b72922c5f, < 8d7924ce85ba8d7924ce85ba
8.x≥ 331b72922c5f, < 8e9662fde6d68e9662fde6d6
5.x≥ 5.11, < 5.13.65.13.6
5.x≥ 5.5, < 5.10.545.10.54
5.4≥ 3.18, < 5.4.1365.4.136
5.14= 5.14no fix published
3.18= 3.18no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Linux linux kernel to f5051bcece50 · cac71d27745f · 8d7924ce85ba · 8e9662fde6d6 · 5.13.6 · 5.10.54 · 5.4.136

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2024-05-21
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2021-47295?

In the Linux kernel, the following vulnerability has been resolved: net: sched: fix memory leak in tcindex_partial_destroy_work Syzbot reported memory leak in tcindex_set_parms(). The problem was in non-freed perfect hash in tcindex_partial_destroy_work(). In tcindex_set_parms() new tcindex_data is allocated and some fields from old one are copied to new one, but not the perfect hash. Since tcindex_partial_destroy_work() is the destroy function for old tcindex_data, we need to free perfect hash to avoid memory leak.

Is CVE-2021-47295 actively exploited?

Active exploitation of CVE-2021-47295 has not been confirmed. Its EPSS score was 1.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-47295?

CVE-2021-47295 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Running Linux kernel? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, October 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database