CVE-2021-39793
HighExploitedPublic exploitIn 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.
Published Mar 16, 2022 · Updated Oct 14, 2026 · Also known as A-210470189, PUB-A-210470189
Key Facts
Patch immediately- CVE-2021-39793 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Android (Google), :unknown: (android).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 7, 2022. Public exploit code is available.
- EPSS estimates a 0.7% probability of exploitation in the next 30 days.
- Fixed versions are available, including :unknown: Pixel-family specific:2022-03-05.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
0.7%
Higher than 51.6% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2021-39793 brief as a PDF
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Description
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
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Apr 11, 2022 | May 2, 2022 | Not reported |
| Industry KEV feed | Mar 7, 2022 | May 2, 2022 | Not reported |
| CIRCL KEV | Apr 11, 2022 | May 2, 2022 | Not reported |
| ENISA EUVD | Apr 11, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| AndroidGoogle | >= Android kernel | n/a |
| :unknown:android | >= Pixel-family specific:0 | Pixel-family specific:2022-03-05 |
Patched Releases
:unknown:
Pixel-family specific:2022-03-05
Timeline
Added to Industry KEV feed
Mar 7, 2022
Publicly disclosed
Mar 16, 2022
Added to CISA KEV
Apr 11, 2022
Added to CIRCL KEV
Apr 11, 2022
Added to ENISA EUVD
Apr 11, 2022
Last updated
Oct 14, 2026
Weakness Type
- CWE-787 Out-of-bounds Write
References
- advisoryhttps://source.android.com/security/bulletin/2022-03-01
- advisoryhttps://source.android.com/security/bulletin/pixel/2022-03-01
- advisoryhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39793
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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.
Affected: Android (Google) versions >= Android kernel; :unknown: (android) versions >= Pixel-family specific:0. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 7, 2022.
Yes. It was added on Apr 11, 2022 with a federal remediation due date of May 2, 2022.
Public exploit code is available.
Fixed versions are available, including :unknown: Pixel-family specific:2022-03-05.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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