An issue was discovered in the Arm Mali GPU Kernel Driver. A non-privileged user can make improper GPU processing operations to gain access to already freed memory, write a limited amount outside of buffer bounds, or to disclose details of memory mappings. This affects Midgard r4p0 through r32p0, Bifrost r0p0 through r38p0 and r39p0 before r38p1, and Valhall r19p0 through r38p0 and r39p0 before r38p1.
Weakness
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Bifrost_gpu_kernel_driver | Arm | r0p0 (including) | r38p0 (including) |
| Bifrost_gpu_kernel_driver | Arm | r39p0 (including) | r39p0 (including) |
| Midgard_gpu_kernel_driver | Arm | r4p0 (including) | r32p0 (including) |
| Valhall_gpu_kernel_driver | Arm | r19p0 (including) | r38p0 (including) |
| Valhall_gpu_kernel_driver | Arm | r39p0 (including) | r39p0 (including) |
Potential Mitigations
References
- http://packetstormsecurity.com/files/168431/Arm-Mali-Released-Buffer-Use-After-Free.html
- http://packetstormsecurity.com/files/168432/Arm-Mali-Physical-Address-Exposure.html
- http://packetstormsecurity.com/files/168433/Arm-Mali-Race-Condition.html
- http://packetstormsecurity.com/files/168434/Arm-Mali-CSF-Missing-Buffer-Size-Check.html
- https://developer.arm.com/Arm%20Security%20Center/Mali%20GPU%20Driver%20Vulnerabilities
- http://packetstormsecurity.com/files/168431/Arm-Mali-Released-Buffer-Use-After-Free.html
- http://packetstormsecurity.com/files/168432/Arm-Mali-Physical-Address-Exposure.html
- http://packetstormsecurity.com/files/168433/Arm-Mali-Race-Condition.html
- http://packetstormsecurity.com/files/168434/Arm-Mali-CSF-Missing-Buffer-Size-Check.html
- https://developer.arm.com/Arm%20Security%20Center/Mali%20GPU%20Driver%20Vulnerabilities