CVE-2021-28664

Name: CVE-2021-28664
Creator: NVD / NIST
Published: 2021-05-10T15:15:07.59+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10Actively ExploitedEPSS 5.46%

Last modified Jun 17, 2026

CVE-2021-28664 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. The Arm Mali GPU kernel driver allows privilege escalation or a denial of service (memory corruption) because an unprivileged user can achieve read/write access to read-only pages. This affects Bifrost r0p0 through r29p0 before r30p0, Valhall r19p0 through r29p0 before r30p0, and Midgard r8p0 through r30p0 before r31p0.. CISA has confirmed active exploitation in the wild. EPSS estimates a 5.46% chance of exploitation in the next 30 days.

Description

The Arm Mali GPU kernel driver allows privilege escalation or a denial of service (memory corruption) because an unprivileged user can achieve read/write access to read-only pages. This affects Bifrost r0p0 through r29p0 before r30p0, Valhall r19p0 through r29p0 before r30p0, and Midgard r8p0 through r30p0 before r31p0.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

5.46%

91.7th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Nov 17, 2021.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Arm	Bifrost Gpu Kernel Driver	>= r0p0, < r29p0
Arm	Midgard Gpu Kernel Driver	>= r8p0, < r31p0
Arm	Valhall Gpu Kernel Driver	>= r19p0, < r29p0

References

https://developer.arm.com/Arm%20Security%20Center/Mali%20GPU%20Driver%20VulnerabilitiesVendor Advisory
https://developer.arm.com/support/arm-security-updatesVendor Advisory
https://developer.arm.com/support/arm-security-updates/mali-gpu-kernel-driverVendor Advisory
https://developer.arm.com/Arm%20Security%20Center/Mali%20GPU%20Driver%20VulnerabilitiesVendor Advisory
https://developer.arm.com/support/arm-security-updatesVendor Advisory
https://developer.arm.com/support/arm-security-updates/mali-gpu-kernel-driverVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-28664US Government Resource

Timeline

Published: May 10, 2021
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-28664?

How severe is CVE-2021-28664?

CVE-2021-28664 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 5.46% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-28664?

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-2021-28664?

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

Scan your code now

Source: NVD / NIST