CVE-2026-31766

Kernel doorbell-space corruption via unchecked user offset

Published May 1, 2026 · Updated May 1, 2026

Improper input validation in AMDGPU user queues in affected Linux Kernel releases allows local users to corrupt kernel doorbell space. amdgpu_userq_get_doorbell_index() forwards the user-controlled doorbell_offset without checking it against the doorbell BO, so BAR index arithmetic can select space outside that allocation. The path requires local low-privileged access and AMDGPU user queue creation; corruption can alter kernel-managed GPU doorbells or interrupt their operation.

CVSS severity7.1
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in AMDGPU user queues in affected Linux Kernel releases allows local users to corrupt kernel doorbell space. amdgpu_userq_get_doorbell_index() forwards the user-controlled doorbell_offset without checking it against the doorbell BO, so BAR index arithmetic can select space outside that allocation. The path requires local low-privileged access and AMDGPU user queue creation; corruption can alter kernel-managed GPU doorbells or interrupt their operation.

The record

CVE
CVE-2026-31766
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.16
  2. Affected versionversion=f09c1e6077abd1bc2ddd2b97e1135215801ca7f9 <3543005a42d7e8e12b21897ef6798541bf7cbcd3
  3. Affected versionversion=f09c1e6077abd1bc2ddd2b97e1135215801ca7f9 <86b732fbc37ce4fb76cdd4af0fb7e30a6acdbce6
  4. Affected versionversion=f09c1e6077abd1bc2ddd2b97e1135215801ca7f9 <a018d1819f158991b7308e4f74609c6c029b670c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.16; version=f09c1e6077abd1bc2ddd2b97e1135215801ca7f9 <3543005a42d7e8e12b21897ef6798541bf7cbcd3; version=f09c1e6077abd1bc2ddd2b97e1135215801ca7f9 <86b732fbc37ce4fb76cdd4af0fb7e30a6acdbce6; version=f09c1e6077abd1bc2ddd2b97e1135215801ca7f9 <a018d1819f158991b7308e4f74609c6c029b670c

Published CVSS scores

7.1kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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

No sourced classifications are available.

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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