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

CVE-2026-99150 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-99150, released November 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-99150
- Priority: Routine
- CVSS: 3.3 (Low)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 28, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99150

## 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)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-99150](https://patchblox.com/security/data/fix/linux/debian-cve-2026-99150.md) | Nov 3, 2026 |
| Linux | linux Debian 14 | 7.2.13-1 | [DEBIAN-CVE-2026-99150](https://patchblox.com/security/data/fix/linux/debian-cve-2026-99150.md) | Nov 3, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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