CVE-2023-21402
NVD-CWE-noinfoPublished: December 4, 2023· Updated: Jun 17, 2026
Official Description
In MMU_UnmapPages of mmu_common.c, there is a possible out of bounds read due to improper input validation. This could lead to local escalation of privilege in the kernel with no additional execution privileges needed. User interaction is not needed for exploitation.
Risk Analysis
Improper input validation leads to an out-of-bounds read in the kernel, potentially enabling local privilege escalation. This is a critical vulnerability with a CVSS score of 9.8.
No public exploit is known, and it is not in the CISA KEV. It is remotely exploitable.
Ensure all Android devices are updated with the latest security patches.
Technical Analysis
CVE-2023-21402 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (2)
Quick Facts
Related CVEs (NVD-CWE-noinfo)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2023-21402 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts