CVE-2026-68103

GPU service interruption via doorbell mapping overwrite

Published Aug 10, 2026 · Updated Aug 10, 2026

A doorbell-mapping flaw in Linux 6.16 through 7.1.5 and 7.2-rc1 allows local users to interrupt AMD GPU service via user queues. The amdgpu_userq_create path uses xa_store_irq() to replace an occupied device-global doorbell entry instead of rejecting the duplicate. Access to an AMDGPU render node is required; a duplicate handle and offset can misroute fence IRQs, hang queues, and trigger GPU recovery.

CVSS severity7.1
High
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A doorbell-mapping flaw in Linux 6.16 through 7.1.5 and 7.2-rc1 allows local users to interrupt AMD GPU service via user queues. The amdgpu_userq_create path uses xa_store_irq() to replace an occupied device-global doorbell entry instead of rejecting the duplicate. Access to an AMDGPU render node is required; a duplicate handle and offset can misroute fence IRQs, hang queues, and trigger GPU recovery.

The record

CVE
CVE-2026-68103
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-367, T1499
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=0 <7.1.6
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1050d258c7c56066d2dcaedf8d0ef66364062adc
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a609b6278bf3cde17eeee6620091465521e4b02c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0 <7.1.6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1050d258c7c56066d2dcaedf8d0ef66364062adc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a609b6278bf3cde17eeee6620091465521e4b02c

Published CVSS scores

7.1Linux Kernel CVE TeamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/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 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

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1499Endpoint 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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