7.5

CVE-2021-47295: net: sched: fix memory leak in tcindex_partial_destroy_work

Modified
AliasesUBUNTU-CVE-2021-47295DEBIAN-CVE-2021-47295
Published 21-05-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-47295 is a high (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in linux. EPSS estimates a 1.50% chance of exploitation in the next 30 days, higher than 74.2% 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
1.50%
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 3 · Related 3
SUSE-SU-2024:2892-1SUSE-SU-2024:2901-1SUSE-SU-2024:2940-1

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: 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.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

1.50%

Chance of exploitation in the next 30 days

Percentile

74%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.50% 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.

Ubuntu87 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≥ 331b72922c5f58d48fd5500acadc91777cc31970, < 53af9c793f644d5841d84d8e0ad83bd7ab47f3e0 | ≥ 331b72922c5f58d48fd5500acadc91777cc31970, < 01d0d2b8b4e3cf2110baba9371c0c3d04ad5c77b | ≥ 331b72922c5f58d48fd5500acadc91777cc31970, < 8d7924ce85bae64e7a67c366c7c50840f49f3a62 | ≥ 331b72922c5f58d48fd5500acadc91777cc31970, < 7a6fb69bbcb21e9ce13bdf18c008c268874f0480 | ≥ 331b72922c5f58d48fd5500acadc91777cc31970, < 8e9662fde6d63c78eb1350f6167f64c9d71a865b | ≥ 331b72922c5f58d48fd5500acadc91777cc31970, < 18c3fa7a7fdbb4d21dafc8a7710ae2c1680930f6 | ≥ 331b72922c5f58d48fd5500acadc91777cc31970, < cac71d27745f92ee13f0ecc668ffe151a4a9c9b1 | ≥ 331b72922c5f58d48fd5500acadc91777cc31970, < f5051bcece50140abd1a11a2d36dc3ec5484fc32 | ≥ 331b72922c5f58d48fd5500acadc91777cc31970, < 7c183dc0af472dec33d2c0786a5e356baa8cad19 | ≥ 331b72922c5f58d48fd5500acadc91777cc31970, < 3abebc503a5148072052c229c6b04b329a420ecd | ≥ 331b72922c5f58d48fd5500acadc91777cc31970, < 372ae77cf11d11fb118cbe2d37def9dd5f826abd | 3.18
  • linux_kernel≥ 3.18, < 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 · 90 products

References

15 links
Show all 15 references