7.8

CVE-2021-3715: linux linux_kernel Use After Free

Modified
AliasesRHSA-2021:3438RHSA-2021:3439RHSA-2021:3441
Published 02-03-2022Last modified 03-08-2024

Vulnerability summary

CVE-2021-3715 is a high (CVSS 7.8) Use After Free vulnerability in linux linux_kernel. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 29% 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
0.35%
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 30 · Related 20
LSN-0082-1OPENSUSE-SU-2021:1477-1OPENSUSE-SU-2021:3641-1OPENSUSE-SU-2021:3675-1OPENSUSE-SU-2021:3876-1RHSA-2020:4431

Timeline

  1. 02-03-2022
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

A flaw was found in the "Routing decision" classifier in the Linux kernel's Traffic Control networking subsystem in the way it handled changing of classification filters, leading to a use-after-free condition. This flaw allows unprivileged local users to escalate their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.35%

Chance of exploitation in the next 30 days

Percentile

29%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.35% 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: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Redhat67 products
  • bpftool< 0:3.10.0-1160.42.2.el7
  • bpftool-debuginfo< 0:3.10.0-1160.42.2.el7
  • kernel< 0:3.10.0-1160.42.2.el7
  • kernel-abi-whitelists< 0:3.10.0-1160.42.2.el7
  • kernel-bootwrapper< 0:3.10.0-1160.42.2.el7
Ubuntu36 products
  • linux< 4.4.0-179.209 | < 4.15.0-99.100
  • linux-aws< 4.4.0-1067.71 | < 4.4.0-1107.118 | < 4.15.0-1066.70
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.3All versions (No fix recorded)
  • linux-aws-5.8All versions (No fix recorded)
Debian1 product
  • linux< 5.5.17-1
Linux1 product
  • linux_kernel≥ 3.18, < 4.4.218 | ≥ 4.5, < 4.9.218 | ≥ 4.10, < 4.14.175 | ≥ 4.15, < 4.19.114 | ≥ 4.20, < 5.4.29 | ≥ 5.5.0, < 5.5.14

4 vendors · 105 products

References

16 links
Show all 16 references