Arm has issued a security bulletin warning of a memory-related vulnerability in Bifrost and Valhall GPU kernel drivers that is being exploited in the wild.
The security issue is tracked as CVE-2024-4610 and is a use-after-free vulnerability (UAF) that impacts all versions of Bifrost and Valhall drivers from r34p0 through r40p0.
UAF flaws occur when a program continues to use a pointer to a memory location after it has been freed. These bugs can lead to information disclosure and arbitrary code execution.
"A local non-privileged user can make improper GPU memory processing operations to gain access to already freed memory," Arm explains.
The company also said that it is "aware of reports of this vulnerability being exploited in the wild. Users are recommended to upgrade if they are impacted by this issue."
The chip maker fixed the vulnerability in version r41p0 of Bifrost and Valhall GPU Kernel Driver, which was released in on November 24, 2022. Currently, the latest version of the drivers is r49p0.
BleepingComputer reached out to Arm to clarify the recent identifier for a vulnerability that was fixed in 2022.
The company provided the following explanation:
"In 2022 Arm fixed a weakness in the r41p0 release for the Bifrost and Valhall Mali GPU kernel driver. An external researcher recently provided new information which reclassifies this weakness as a vulnerability. After Arm assessed this issue as a vulnerability, a CVE was published."
Due to the complexity of the supply chain on Android, many end users may get patched drivers with significant delays.
Once Arm releases a security update, device manufacturers need to integrate it into their firmware and in many cases carriers also need to approve it. Depending on the model of the phone, some makers may choose to focus on newer devices and discontinue support for older ones.
Bifrost-based Mali GPUs are used in smartphones/tables (G31, G51, G52, G71, and G76), single-board computers, Chromebooks, and various embedded systems.
Valhall GPUs are present in high-end smartphones/tables with chips such as the Mali G57 and G77, automotive infotainment systems, and high-performance smart TVs.
It is important to note that some of the impacted devices may no longer be supported with security updates.
Update [June 14]: Article updated with comment from Arm clarifying the recent identifier for the vulnerability that had been fixed in 2022.
Comments
martinjester - 2 weeks ago
You can find out the specific GPU used by your Android device at
https://www.devicespecifications.com/
My Motorola phone is, unfortunately.
JohnC_21 - 2 weeks ago
"A local non-privileged user can make improper GPU memory processing operations to gain access to already freed memory,"
Seems somebody would need physical access to the device in order exploit the flaw.
NoneRain - 2 weeks ago
Typically, a "local non-privileged user" refers to any process running with user permissions on a device. The term "local" indicates that the vulnerability can be exploited locally, such as through an app installed, and not remotely, like a RCE.
JohnC_21 - 2 weeks ago
Thanks for that explanation.