CVE-2023-21402

Name: CVE-2023-21402
Creator: NVD / NIST
Published: 2023-12-04T23:15:23.027+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.41%

Last modified Jun 17, 2026

CVE-2023-21402 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.41% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.41%

33.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Google	Android	All versions

References

https://source.android.com/security/bulletin/2023-12-01Vendor Advisory
https://source.android.com/security/bulletin/2023-12-01Vendor Advisory

Timeline

Published: Dec 4, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-21402?

How severe is CVE-2023-21402?

CVE-2023-21402 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.41% probability of exploitation in the next 30 days.

How do I fix CVE-2023-21402?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-21402?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST