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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-99150
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-28 11:17:35 UTC
Updated2026-10-28 11:17:35 UTC
DescriptionIn 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)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9eee152aab56d374edb9ad21b3db05f5cdda2fe6 652b1f26125fe48aed5f4944698a85b457eef491 git Not specified
CNA Linux Linux affected 9eee152aab56d374edb9ad21b3db05f5cdda2fe6 253555a9baccefffe1f6e5f2fe54363c7c01ebb9 git Not specified
CNA Linux Linux affected 9eee152aab56d374edb9ad21b3db05f5cdda2fe6 de9f6bcdb44f0e410031002e2f103826ea6b6259 git Not specified
CNA Linux Linux affected 865e2dbadf6856c9219626fbd6154cac44e5fbca git Not specified
CNA Linux Linux affected 5.8.2 5.9 semver Not specified
CNA Linux Linux affected 5.9 Not specified
CNA Linux Linux unaffected 5.9 semver Not specified
CNA Linux Linux unaffected 6.18.59 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.13 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/253555a9baccefffe1f6e5f2fe54363c7c01ebb9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/de9f6bcdb44f0e410031002e2f103826ea6b6259 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/652b1f26125fe48aed5f4944698a85b457eef491 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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