CVE-2021-47362 drm/amd/pm: Update intermediate power state for SI
A null pointer dereference in the AMD GPU power management driver can cause a system crash during initialization on specific platforms.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-47362?
CVE-2021-47362 is a medium-severity vulnerability in Linux kernel, published on 21 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
drm/amd/pm: Update intermediate power state for SI
Update the current state as boot state during dpm initialization. During the subsequent initialization, set_power_state gets called to transition to the final power state. set_power_state refers to values from the current state and without current state populated, it could result in NULL pointer dereference.
For ex: on platforms where PCI speed change is supported through ACPI ATCS method, the link speed of current state needs to be queried before deciding on changing to final power state's link speed. The logic to query ATCS-support was broken on certain platforms. The issue became visible when broken ATCS-support logic got fixed with commit f9b7f3703ff9 ("drm/amdgpu/acpi: make ATPX/ATCS structures global (v2)").
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1698
Weakness: CWE-476
Which versions are affected by CVE-2021-47362?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47362?
Apply the vendor's patch.
Is CVE-2021-47362 being exploited?
There is no known exploitation of CVE-2021-47362 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47362, GHSA-cc2x-949j-9v5x, UBUNTU-CVE-2021-47362.