CVE-2021-28663 Arm Mali Graphics Processing Unit (GPU) Use-After-Free
Attackers can exploit a use-after-free in the Arm Mali GPU kernel driver to escalate privileges or disclose information on Android devices.
- Exploited in the wild
- Since 3 Nov 2021
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-28663?
CVE-2021-28663 is a high-severity use after free vulnerability in Arm Valhall Gpu Kernel Driver, published on 10 May 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-416
Which versions are affected by CVE-2021-28663?
It affects 3 products.
Products include Arm Bifrost Gpu Kernel Driver, Arm Midgard Gpu Kernel Driver, Arm Valhall Gpu Kernel Driver.
How do I fix CVE-2021-28663?
Apply the vendor's patch. US federal agencies must fix it by 17 Nov 2021.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2021-28663 being exploited?
Yes. Attackers have exploited CVE-2021-28663 in the wild since at least 3 Nov 2021.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Arm Valhall Gpu Kernel Driver
Sources
Also known as A-174259860, ASB-A-174259860, GHSA-2rc2-892p-6hc2.