7.8

CVE-2021-4028: linux linux_kernel Use After Free

Modified
AliasesRHSA-2022:2188UBUNTU-CVE-2021-4028DEBIAN-CVE-2021-4028
Published 24-08-2022Last modified 03-08-2024

Vulnerability summary

CVE-2021-4028 is a high (CVSS 7.8) Use After Free vulnerability in linux linux_kernel. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 24.7% 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
0.32%
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 26 · Related 4
RHSA-2022:0590RHSA-2022:0629RHSA-2022:0636RHSA-2022:0771RHSA-2022:0772RHSA-2022:0777

Timeline

  1. 24-08-2022
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

A flaw in the Linux kernel's implementation of RDMA communications manager listener code allowed an attacker with local access to setup a socket to listen on a high port allowing for a list element to be used after free. Given the ability to execute code, a local attacker could leverage this use-after-free to crash the system or possibly escalate privileges on the system.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.32%

Chance of exploitation in the next 30 days

Percentile

25%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.31% 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.

Ubuntu33 products
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11< 5.11.0-1023.24~20.04.1
  • linux-aws-5.3All versions (No fix recorded)
  • linux-aws-5.8All versions (No fix recorded)
  • linux-azureAll versions (No fix recorded)
Redhat17 products
  • kernel< 0:3.10.0-693.100.1.el7
  • kernel-abi-whitelists< 0:3.10.0-693.100.1.el7
  • kernel-debug< 0:3.10.0-693.100.1.el7
  • kernel-debug-debuginfo< 0:3.10.0-693.100.1.el7
  • kernel-debug-devel< 0:3.10.0-693.100.1.el7
Debian1 product
  • linux< 5.14.12-1
Linux1 product
Suse1 product

5 vendors · 53 products

References

13 links
Show all 13 references