CVE-2025-40329

System hang via DRM scheduler lock inversion

Published Dec 9, 2025 · Updated May 11, 2026

Deadlock in the Linux kernel DRM scheduler allows attackers to hang affected systems when a fence callback encounters conflicting locks. drm_sched_entity_kill_jobs_cb accesses job dependencies without interrupt-safe locking and can add a callback while fence objects share a spinlock. Public sources do not establish a reliable attacker-controlled trigger; the documented consequence is a system hang under the conflicting lock sequence.

CVSS severityUnavailable
Unscored
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in the Linux kernel DRM scheduler allows attackers to hang affected systems when a fence callback encounters conflicting locks. drm_sched_entity_kill_jobs_cb accesses job dependencies without interrupt-safe locking and can add a callback while fence objects share a spinlock. Public sources do not establish a reliable attacker-controlled trigger; the documented consequence is a system hang under the conflicting lock sequence.

The record

CVE
CVE-2025-40329
Published
Dec 9, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 9, 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

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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=2fdb8a8f07c2f1353770a324fd19b8114e4329ac <0d63031ee4a57be0252cb9a4e09ae921c75cece9
  2. Affected versionversion=2fdb8a8f07c2f1353770a324fd19b8114e4329ac <3e8ada4fd838e3fd2cca94000dac054f3a347c01
  3. Affected versionversion=2fdb8a8f07c2f1353770a324fd19b8114e4329ac <487df8b698345dd5a91346335f05170ed5f29d4e
  4. Affected versionversion=2fdb8a8f07c2f1353770a324fd19b8114e4329ac <70150b9443dddf02157d821c68abf438f55a2e8e
  5. Affected versionversion=6.2

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2fdb8a8f07c2f1353770a324fd19b8114e4329ac <0d63031ee4a57be0252cb9a4e09ae921c75cece9; version=2fdb8a8f07c2f1353770a324fd19b8114e4329ac <3e8ada4fd838e3fd2cca94000dac054f3a347c01; version=2fdb8a8f07c2f1353770a324fd19b8114e4329ac <487df8b698345dd5a91346335f05170ed5f29d4e; version=2fdb8a8f07c2f1353770a324fd19b8114e4329ac <70150b9443dddf02157d821c68abf438f55a2e8e; version=6.2

Published CVSS scores

No CVSS assessment is available in this record.

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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