What is CVE-2021-39648?

CVE-2021-39648 is a medium-severity vulnerability in Google Android, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 4.1/10. Published 2021-12-15.

How severe is CVE-2021-39648?

Medium severity. CVSS v3 base score is 4.1 out of 10.

Vulnerability in Google Android

CVE-2021-39648

In gadget_dev_desc_UDC_show of configfs.c, there is a possible disclosure of kernel heap memory due to a race condition. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-160822094References: Upstream kernel

Vulnerability class: Race Condition

Published 2021-12-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.1 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.002 (4.7th percentile), scored 2026-10-06.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 4.7% 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-362 — Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)

References

source.android.com/security/bulletin/pixel/2021-12-01 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-39648?: CVE-2021-39648 is a medium-severity vulnerability in Google Android, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 4.1/10. Published 2021-12-15.
How severe is CVE-2021-39648?: Medium severity. CVSS v3 base score is 4.1 out of 10.