What is CVE-2021-39793?

CVE-2021-39793 is a high-severity vulnerability in Google Android, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2022-03-16.

How severe is CVE-2021-39793?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2021-39793 known to be exploited?

Yes. CVE-2021-39793 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-04-11), indicating it is being actively exploited. 11 public proof-of-concept repositories are indexed.

Buffer overflow in Google Android

CVE-2021-39793

In kbase_jd_user_buf_pin_pages of mali_kbase_mem.c, there is a possible out of bounds write due to a logic error in the code. 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-210470189References: N/A

Vulnerability class: Buffer Overflow

Published 2022-03-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (51.7th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: -0.001

Affected products

Google Android
Android — versions Android kernel

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-04-11. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-05-02.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

source.android.com/security/bulletin/pixel/2022-03-01 (Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Third Party Advisory, US Government Resource)

Frequently asked questions

What is CVE-2021-39793?: CVE-2021-39793 is a high-severity vulnerability in Google Android, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2022-03-16.
How severe is CVE-2021-39793?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2021-39793 known to be exploited?: Yes. CVE-2021-39793 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-04-11), indicating it is being actively exploited. 11 public proof-of-concept repositories are indexed.