7.8

CVE-2021-39634: google android Use After Free

Modified
AliasesUBUNTU-CVE-2021-39634DEBIAN-CVE-2021-39634
Published 14-01-2022Last modified 04-08-2024

Vulnerability summary

CVE-2021-39634 is a high (CVSS 7.8) Use After Free vulnerability in google android. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 17% 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
0.25%
0%100%
Low · +0.10 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 1 · Related 1
USN-8924-1

Timeline

  1. 14-01-2022
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

In fs/eventpoll.c, there is a possible use after free. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-204450605References: Upstream kernel

CVSS metrics

5 scores · 3 sources · 3 versions

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

17%

Versus all other CVEs

30-day change

Increase +0.10 pp

From 0.15% 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.

Ubuntu50 products
  • linuxAll versions (No fix recorded) | < 3.13.0-218.269 | < 4.4.0-197.229 | < 4.15.0-126.129 | < 5.4.0-56.62
  • linux-aws< 4.4.0-1082.86 | < 4.4.0-1118.132 | < 4.15.0-1088.93 | < 5.4.0-1030.31
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.3All versions (No fix recorded)
  • linux-aws-5.4< 5.4.0-1030.31~18.04.1
Debian1 product
  • linux< 5.8.14-1
Google1 product

3 vendors · 52 products

References

6 links