CVE-2023-21402 Memory corruption in Android

What is CVE-2023-21402?

CVE-2023-21402 is a critical memory corruption vulnerability in Google Android, published on 4 Dec 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

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.

Which versions are affected by CVE-2023-21402?

It affects 1 product.

Products include Google Android.

How do I fix CVE-2023-21402?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2023-21402 being exploited?

There is no known exploitation of CVE-2023-21402 in the wild and no public exploit code.

Other vulnerabilities in Google Android

• CVE-2026-58704 Google Pixel Improper Authorization Exploited High 8.8
• CVE-2025-48543 Android Runtime Use-After-Free Exploited High 8.8
• CVE-2023-35674 Android Framework Privilege Escalation Exploited High 8.8
• CVE-2025-48595 Android Framework Integer Overflow Exploited High 8.4
• CVE-2024-32896 Android Pixel Privilege Escalation Exploited High 8.1

All Google Android vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as A-305093885, ASB-A-305093885, GHSA-p89v-fx27-fcch.