CVE-2025-40334

GPU state corruption via unvalidated userq mappings

Published Dec 9, 2025 · Updated Aug 5, 2026

Out-of-bounds access in Linux kernel 6.16 through 6.17.7 allows local users to corrupt GPU state through a crafted amdgpu userq ioctl. The amdgpu_userq_ioctl path accepts queue, read-pointer, EOP, shadow, and context-save addresses and sizes without confirming that each range resides in a valid GPU VM mapping. Any process holding an amdgpu render-node descriptor can disclose fence values, forge fence completion state, or repeatedly fault and wedge the GPU without DRM master rights.

CVSS severity7.3
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in Linux kernel 6.16 through 6.17.7 allows local users to corrupt GPU state through a crafted amdgpu userq ioctl. The amdgpu_userq_ioctl path accepts queue, read-pointer, EOP, shadow, and context-save addresses and sizes without confirming that each range resides in a valid GPU VM mapping. Any process holding an amdgpu render-node descriptor can disclose fence values, forge fence completion state, or repeatedly fault and wedge the GPU without DRM master rights.

The record

CVE
CVE-2025-40334
Published
Dec 9, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5501117d24a38dadff3dbd8d3102559b27929668 <5a577de86c4a1c67ca405571d6ef84e65c6897d1
  2. Affected versionversion=5501117d24a38dadff3dbd8d3102559b27929668 <9e46b8bb0539d7bc9a9e7b3072fa4f6082490392
  3. Affected versionversion=6.16
  4. Affected versionversion=fbf136b932358da1c65eb6fedd064a33a7a96aaa <9e46b8bb0539d7bc9a9e7b3072fa4f6082490392

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5501117d24a38dadff3dbd8d3102559b27929668 <5a577de86c4a1c67ca405571d6ef84e65c6897d1; version=5501117d24a38dadff3dbd8d3102559b27929668 <9e46b8bb0539d7bc9a9e7b3072fa4f6082490392; version=6.16; version=fbf136b932358da1c65eb6fedd064a33a7a96aaa <9e46b8bb0539d7bc9a9e7b3072fa4f6082490392

Published CVSS scores

7.3LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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