# CVE-2021-28664

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.

- Page: https://www.vulneraibility.com/cve/CVE-2021-28664
- CVSS: 8.8
- Known exploited: yes, in CISA KEV since 2021-11-03; CISA due date 2021-11-17
- EPSS: 5.45% (percentile 92.8)
- Unvetted proof-of-concept code on GitHub: 1 GitHub proof of concept (first 2026-09-12)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2025-02-03)
- Weakness: CWE-787
- Published: 2021-05-10

## Affected

- arm:bifrost_gpu_kernel_driver
- arm:midgard_gpu_kernel_driver
- arm:valhall_gpu_kernel_driver

## References

- [other] https://developer.arm.com/support/arm-security-updates
- [other] https://developer.arm.com/support/arm-security-updates/mali-gpu-kernel-driver
- [other] https://developer.arm.com/Arm%20Security%20Center/Mali%20GPU%20Driver%20Vulnerabilities
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-28664

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.