drm/amdgpu: don't drop the runtime PM reference twice in amdgpu_gpr

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: don't drop the runtime PM reference twice in amdgpu_gpr amdgpu_debugfs_gpr_read() drops its runtime PM reference right after reading the wave registers. When copying them to userspace fails, it jumps to the err label, which drops the reference a second time. A read into a bad buffer on Navi31 either steals a reference somebody else holds (power/runtime_usage goes from 1 to 0) or underflows the count: amdgpu 0000:03:00.0: Runtime PM usage count underflow! The registers are already in the kernel buffer at that point, so finish the hardware access first and copy the buffer with a single copy_to_user() instead of the put_user() loop with its own error path. (cherry picked from commit 31035bbd74f7c3e10c163db875b8e67f8b50ee6a)

Timeline

1. Oct 28, 2026, 10:35 AM UTCCVE published
2. Oct 28, 2026, 10:41 AM UTCFirst seen by cve.now
3. Oct 30, 2026, 12:42 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 5.8.2 · fixed in 5.9

• Linux Linux

  5.9

• KernelLinux

  From 5.9.0 · fixed in 6.18.59; From 6.19.0 · fixed in 7.2.13

References 8