What is CVE-2021-0938?

CVE-2021-0938 is a medium-severity vulnerability in Google Android, classified under Use of Uninitialized Resource. CVSS score: 5.5/10. Published 2021-10-25.

How severe is CVE-2021-0938?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Google Android

CVE-2021-0938

In memzero_explicit of compiler-clang.h, there is a possible bypass of defense in depth due to uninitialized data. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-171418586References: Upstream kernel

Published 2021-10-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.002 (4.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 4.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Google Android
Android — versions Android kernel

Weakness classification (CWE)

CWE-908 — Use of Uninitialized Resource

References

source.android.com/security/bulletin/pixel/2021-10-01 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-0938?: CVE-2021-0938 is a medium-severity vulnerability in Google Android, classified under Use of Uninitialized Resource. CVSS score: 5.5/10. Published 2021-10-25.
How severe is CVE-2021-0938?: Medium severity. CVSS v3 base score is 5.5 out of 10.