CVE-2021-39793 is a vulnerability in Google Android
Published on March 16, 2022
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 Vulnerability
This Google Pixel Out-of-Bounds Write Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Google Pixel contains a possible out-of-bounds write due to a logic error in the code that could lead to local escalation of privilege.
The following remediation steps are recommended / required by May 2, 2022: Apply updates per vendor instructions.
Vulnerability Analysis
CVE-2021-39793 can be exploited with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a Memory Corruption Vulnerability?
The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.
CVE-2021-39793 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2021-39793
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Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.