CVE-2025-37930

Local denial of service via fence race

Published May 20, 2025 · Updated May 11, 2026

Race condition in the Nouveau fence code in Linux from 5.6 until each branch's fix allows local users to disrupt system availability. nouveau_fence_done() can signal a fence while it remains pending, and nouveau_fence_context_kill() then sets an error on the already-signaled fence, triggering WARN_ON. Low-privileged local access and use of a Nouveau-backed graphics channel are required; no data access or modification is disclosed.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Nouveau fence code in Linux from 5.6 until each branch's fix allows local users to disrupt system availability. nouveau_fence_done() can signal a fence while it remains pending, and nouveau_fence_context_kill() then sets an error on the already-signaled fence, triggering WARN_ON. Low-privileged local access and use of a Nouveau-backed graphics channel are required; no data access or modification is disclosed.

The record

CVE
CVE-2025-37930
Published
May 20, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-617, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 20, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=5.6
  2. Affected versionversion=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <0453825167ecc816ec15c736e52316f69db0deb9
  3. Affected versionversion=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <126f5c6e0cb84e5c6f7a3a856d799d85668fb38e
  4. Affected versionversion=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <2ec0f5f6d4768f292c8406ed92fa699f184577e5
  5. Affected versionversion=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <39d6e889c0b19a2c79e1c74c843ea7c2d0f99c28
  6. Affected versionversion=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <47ca11836c35c5698088fd87f7fb4b0ffa217e17
  7. Affected versionversion=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <b771b2017260ffc3a8d4e81266619649bffcb242
  8. Affected versionversion=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <bbe5679f30d7690a9b6838a583b9690ea73fe0e9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <0453825167ecc816ec15c736e52316f69db0deb9; version=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <126f5c6e0cb84e5c6f7a3a856d799d85668fb38e; version=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <2ec0f5f6d4768f292c8406ed92fa699f184577e5; version=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <39d6e889c0b19a2c79e1c74c843ea7c2d0f99c28; version=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <47ca11836c35c5698088fd87f7fb4b0ffa217e17; version=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <b771b2017260ffc3a8d4e81266619649bffcb242; version=ea13e5abf807ea912ce84eef6a1946b9a38c6508 <bbe5679f30d7690a9b6838a583b9690ea73fe0e9

Published CVSS scores

5.5Canonical UbuntuCVSS:3.1/AV:L/AC:L/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 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

CWE-617Reachable Assertion
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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