Kernel privilege escalation via integer-overflowed buffer write
Published Dec 4, 2023 · Updated Dec 2, 2024
An out-of-bounds write in Android SoC PowerVR GPU code allows local users to escalate privileges in the kernel without user interaction. DevmemIntChangeSparse in devicemem_server.c performs an integer-overflowing calculation that causes a subsequent write to exceed its intended buffer. Exploitation requires local code execution on an Android device containing the affected Imagination Technologies PowerVR GPU component, and successful exploitation grants kernel privileges.
Summary
What happened
An out-of-bounds write in Android SoC PowerVR GPU code allows local users to escalate privileges in the kernel without user interaction. DevmemIntChangeSparse in devicemem_server.c performs an integer-overflowing calculation that causes a subsequent write to exceed its intended buffer. Exploitation requires local code execution on an Android device containing the affected Imagination Technologies PowerVR GPU component, and successful exploitation grants kernel privileges.
The record
- CVE
- CVE-2023-21401
- Published
- Dec 4, 2023
- Updated
- Dec 2, 2024
- Vendor
- Product
- Android
- Classifications
- T1068
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 4, 2023CVE publishedPublication date reported by the CVE source.
- Dec 2, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=Android SoC
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo