CVE-2026-68237

System hang via unsignaled AMDGPU user-queue fence

Published Aug 10, 2026 · Updated Aug 10, 2026

Denial of service in Linux kernel 6.19 allows local users to wedge systems by resetting an AMD GPU while a user queue is being evicted. In amdgpu_userq.c, pre_reset force-completes last_fence only for MAPPED queues, leaving a mid-eviction queue's fence permanently unsignaled after reset. The affected path requires local access, an AMD GPU using user queues, and a reset during a non-MAPPED queue state; eviction, suspend, and process teardown can then wait indefinitely.

CVSS severity4.7
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux kernel 6.19 allows local users to wedge systems by resetting an AMD GPU while a user queue is being evicted. In amdgpu_userq.c, pre_reset force-completes last_fence only for MAPPED queues, leaving a mid-eviction queue's fence permanently unsignaled after reset. The affected path requires local access, an AMD GPU using user queues, and a reset during a non-MAPPED queue state; eviction, suspend, and process teardown can then wait indefinitely.

The record

CVE
CVE-2026-68237
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=290f46cf5726509f55fac4c7abe9b9d311aa5a3a <3085ae8695e025b39d208f288c6265edc75abbe8
  2. Affected versionversion=290f46cf5726509f55fac4c7abe9b9d311aa5a3a <5d75ec2e5f1736c2f10c7d6f4565bf1bf29f29a7
  3. Affected versionversion=6.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=290f46cf5726509f55fac4c7abe9b9d311aa5a3a <3085ae8695e025b39d208f288c6265edc75abbe8; version=290f46cf5726509f55fac4c7abe9b9d311aa5a3a <5d75ec2e5f1736c2f10c7d6f4565bf1bf29f29a7; version=6.19

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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