5.4

CVE-2019-20934: linux linux_kernel Use After Free

Modified
AliasesUBUNTU-CVE-2019-20934DEBIAN-CVE-2019-20934
Published 28-11-2020Last modified 05-08-2024

Vulnerability summary

CVE-2019-20934 is a medium (CVSS 5.4) Use After Free vulnerability in linux linux_kernel. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 24.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.3, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.4/10
010
Medium · v2.0 (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 14 · Related 11
OPENSUSE-SU-2021:0075-1RHSA-2021:2725RHSA-2021:2726RHSA-2021:3987SUSE-SU-2020:3766-1SUSE-SU-2020:3798-1

Timeline

  1. 28-11-2020
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

An issue was discovered in the Linux kernel before 5.2.6. On NUMA systems, the Linux fair scheduler has a use-after-free in show_numa_stats() because NUMA fault statistics are inappropriately freed, aka CID-16d51a590a8c.

CVSS metrics

4 scores · 3 sources · 2 versions

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 0.32% 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.

Ubuntu34 products
  • linuxAll versions (No fix recorded) | < 4.4.0-165.193 | < 4.15.0-60.67
  • linux-aws< 4.4.0-1055.59 | < 4.4.0-1095.106 | < 4.15.0-1047.49
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.3All versions (No fix recorded)
  • linux-aws-fips< 4.15.0-2018.18 | All versions (No fix recorded)
Debian1 product
  • linux< 5.2.6-1
Linux1 product
  • linux_kernel≥ 4.19, < 4.19.64 | ≥ 5.2, ≤ 5.2.17 | 5.3:rc1

3 vendors · 36 products

References

7 links