CVE-2021-28663
highpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.121 · 96 %ileexploit · PoCEUUSadded 2021-11-03remediate by 2021-11-17
required action Apply updates per vendor instructions.
EPSS · scored 2026-10-27
Arm Mali Graphics Processing Unit (GPU) Use-After-Free Vulnerability
The Arm Mali GPU kernel driver allows privilege escalation or information disclosure because GPU memory operations are mishandled, leading to a use-after-free. This affects Bifrost r0p0 through r28p0 before r29p0, Valhall r19p0 through r28p0 before r29p0, and Midgard r4p0 through r30p0.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
exploits (1)
Public proof-of-concept and weaponised exploit code.
affected products (4)
Products and version ranges known to be affected.
- arm bifrost gpu kernel driverr0p0 → r29p0nvdUScpe:2.3:a:arm:bifrost_gpu_kernel_driver:*:*:*:*:*:*:*:*
- arm midgard gpu kernel driverr4p0 → r31p0nvdUScpe:2.3:a:arm:midgard_gpu_kernel_driver:*:*:*:*:*:*:*:*
- arm valhall gpu kernel driverr19p0 → r29p0nvdUScpe:2.3:a:arm:valhall_gpu_kernel_driver:*:*:*:*:*:*:*:*
advisories (1)
Vendor and ecosystem advisories describing this.
- ASB-A-1742598602021-05-01vendor · osvUS
In kbase_mem_from_user_buffer of mali_kbase_mem_linux.c, there is a possible remapping of shared read-only memory as write-able due to a missing permission check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (13)
External citations — patches, advisories, analysis.
- https://developer.arm.com/support/arm-security-updatescnnvd
- https://developer.arm.com/support/arm-security-updates/mali-gpu-kernel-drivercnnvd
- https://device.harmonyos.com/cn/docs/security/update/security-bulletins-phones-202106-0000001165452077cnnvd
- https://github.com/lntrx/CVE-2021-28663cnnvd
- https://vigilance.fr/vulnerability/Google-Android-Pixel-multiple-vulnerabilities-of-May-2021-35227cnnvd
- https://www.cybersecurity-help.cz/vdb/SB2021052006cnnvd
- https://developer.arm.com/support/arm-security-updatesenisa_euvd
- https://developer.arm.com/support/arm-security-updates/mali-gpu-kernel-driverenisa_euvd
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