CVE-2026-23213: drm/amd/pm: Disable MMIO access during SMU Mode 1 reset
In the Linux kernel, the following vulnerability has been resolved:
drm/amd/pm: Disable MMIO access during SMU Mode 1 reset
During Mode 1 reset, the ASIC undergoes a reset cycle and becomes temporarily inaccessible via PCIe. Any attempt to access MMIO registers during this window (e.g., from interrupt handlers or other driver threads) can result in uncompleted PCIe transactions, leading to NMI panics or system hangs.
To prevent this, set the nohwaccess flag to true immediately after triggering the reset. This signals other driver components to skip register accesses while the device is offline.
A memory barrier smpmb() is added to ensure the flag update is globally visible to all cores before the driver enters the sleep/wait state.
(cherry picked from commit 7edb503fe4b6d67f47d8bb0dfafb8e699bb0f8a4)
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-23213?
CVE-2026-23213 has been classified with a high severity level due to potential disruption during Mode 1 reset in AMD GPUs.
How do I fix CVE-2026-23213?
To fix CVE-2026-23213, update your Linux kernel to the latest version where the vulnerability has been patched.
Which software is affected by CVE-2026-23213?
CVE-2026-23213 affects the AMD kernel driver within the Linux kernel.
What is the impact of CVE-2026-23213 on my system?
The impact of CVE-2026-23213 may include temporary loss of access to the GPU during reset cycles, affecting system stability.
Is CVE-2026-23213 being actively exploited?
As of now, there are no known active exploits for CVE-2026-23213, but it is recommended to apply the patch promptly.