Local privilege escalation via unchecked service index
Published Jun 28, 2023 · Updated Dec 4, 2024
Out-of-bounds write in Google's aoc_core Android kernel driver allows local users with System privileges to elevate access. The aoc_service_set_read_blocked function in aoc.c passes the device service_index directly to set_bit for the fixed-size read_blocked_mask without validating that the index is in range. Exploitation requires existing System execution privileges and no user interaction; an out-of-range index writes outside the mask and corrupts adjacent kernel memory during local privilege escalation.
Summary
What happened
Out-of-bounds write in Google's aoc_core Android kernel driver allows local users with System privileges to elevate access. The aoc_service_set_read_blocked function in aoc.c passes the device service_index directly to set_bit for the fixed-size read_blocked_mask without validating that the index is in range. Exploitation requires existing System execution privileges and no user interaction; an out-of-range index writes outside the mask and corrupts adjacent kernel memory during local privilege escalation.
The record
- CVE
- CVE-2023-21236
- Published
- Jun 28, 2023
- Updated
- Dec 4, 2024
- Vendor
- Product
- aoc_core device driver
- Classifications
- CWE-787, T1068
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jun 28, 2023CVE publishedPublication date reported by the CVE source.
- Dec 4, 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 kernel
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
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