Description

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 `no_hw_access` 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 `smp_mb()` 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 Products 6

References 3

• git.kernel.org https://git.kernel.org/stable/c/0de604d0357d0d22cbf03af1077d174b641707b6
  Patch
• git.kernel.org https://git.kernel.org/stable/c/c1853ebbec980d5c05d431bfd6ded73b1363fd00
  Patch
• git.kernel.org https://git.kernel.org/stable/c/cd7ff7fd3e4b77f0b5a292e0926532eaa07c5162
  Patch

Remediation

• git.kernel.org https://git.kernel.org/stable/c/0de604d0357d0d22cbf03af1077d174b641707b6
  Patch
• git.kernel.org https://git.kernel.org/stable/c/c1853ebbec980d5c05d431bfd6ded73b1363fd00
  Patch
• git.kernel.org https://git.kernel.org/stable/c/cd7ff7fd3e4b77f0b5a292e0926532eaa07c5162
  Patch