---
id: CVE-2026-43400
title: 'drm/amdgpu: add upper bound check on user inputs in signal ioctl'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/amdgpu: add upper bound check on user inputs in signal ioctl

  Huge input values in amdgpu_userq_signal_ioctl can lead to a OOM and
  could be exploited.

  So check the…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= a292fdecd72834b3bec380baa5db1e69e7f70679 <
    6fff5204d8aa26b1be50b6427f833bd3e8899c4f
  - >-
    Linux >= a292fdecd72834b3bec380baa5db1e69e7f70679 <
    46630d966b99b0fc6cb01fef4110587f3375a0c0
  - >-
    Linux >= a292fdecd72834b3bec380baa5db1e69e7f70679 <
    ea78f8c68f4f6211c557df49174c54d167821962
  - Linux 6.16
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T15:37:17.931393Z'
published: '2026-05-08'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T15:42:51.799Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43400'
references:
  - url: 'https://git.kernel.org/stable/c/6fff5204d8aa26b1be50b6427f833bd3e8899c4f'
  - url: 'https://git.kernel.org/stable/c/46630d966b99b0fc6cb01fef4110587f3375a0c0'
  - url: 'https://git.kernel.org/stable/c/ea78f8c68f4f6211c557df49174c54d167821962'
tags:
  - cve.org
epss: 0.00126
epssPercentile: 0.02323
ingestedAt: '2026-11-06T15:54:03.925Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu: add upper bound check on user inputs in signal ioctl

Huge input values in amdgpu_userq_signal_ioctl can lead to a OOM and
could be exploited.

So check these input value against AMDGPU_USERQ_MAX_HANDLES
which is big enough value for genuine use cases and could
potentially avoid OOM.

(cherry picked from commit be267e15f99bc97cbe202cd556717797cdcf79a5)

## Affected

- `Linux >= a292fdecd72834b3bec380baa5db1e69e7f70679 < 6fff5204d8aa26b1be50b6427f833bd3e8899c4f`
- `Linux >= a292fdecd72834b3bec380baa5db1e69e7f70679 < 46630d966b99b0fc6cb01fef4110587f3375a0c0`
- `Linux >= a292fdecd72834b3bec380baa5db1e69e7f70679 < ea78f8c68f4f6211c557df49174c54d167821962`
- `Linux 6.16`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.