CVE-2023-21401 Integer overflow in Android

What is CVE-2023-21401?

CVE-2023-21401 is a critical 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 DevmemIntChangeSparse of devicemem_server.c, there is a possible out of bounds write due to an integer overflow. 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-2023-21401?

It affects 1 product.

Products include Google Android.

How do I fix CVE-2023-21401?

Apply the vendor's patch.

Is CVE-2023-21401 being exploited?

There is no known exploitation of CVE-2023-21401 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-305091236, ASB-A-305091236, GHSA-q73m-hf29-h8q4.