CVE-2025-38436

Application hangs via unsignaled scheduled fences

Published Jul 25, 2025 · Updated May 11, 2026

Improper locking in the Linux kernel DRM scheduler allows local users to hang applications whose GPU jobs depend on a killed entity. drm_sched_entity_kill_jobs_work() removes the killed entity's jobs without signaling each scheduled fence, leaving dependent jobs blocked forever. Low-privileged local access and a cross-application GPU fence dependency are required; the reported consequence is limited to hanging dependent applications.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the Linux kernel DRM scheduler allows local users to hang applications whose GPU jobs depend on a killed entity. drm_sched_entity_kill_jobs_work() removes the killed entity's jobs without signaling each scheduled fence, leaving dependent jobs blocked forever. Low-privileged local access and a cross-application GPU fence dependency are required; the reported consequence is limited to hanging dependent applications.

The record

CVE
CVE-2025-38436
Published
Jul 25, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 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=4.3
  2. Affected versionversion=a72ce6f84109c1dec1ab236d65979d3250668af3 <471db2c2d4f80ee94225a1ef246e4f5011733e50
  3. Affected versionversion=a72ce6f84109c1dec1ab236d65979d3250668af3 <8342127a8a65b0673863b106ce32b79c91ae3270
  4. Affected versionversion=a72ce6f84109c1dec1ab236d65979d3250668af3 <aa382a8b6ed483e9812d0e63b6d1bdcba0186f29
  5. Affected versionversion=a72ce6f84109c1dec1ab236d65979d3250668af3 <aefd0a935625165a6ca36d0258d2d053901555df
  6. Affected versionversion=a72ce6f84109c1dec1ab236d65979d3250668af3 <c5734f9bab6f0d40577ad0633af4090a5fda2407

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.3; version=a72ce6f84109c1dec1ab236d65979d3250668af3 <471db2c2d4f80ee94225a1ef246e4f5011733e50; version=a72ce6f84109c1dec1ab236d65979d3250668af3 <8342127a8a65b0673863b106ce32b79c91ae3270; version=a72ce6f84109c1dec1ab236d65979d3250668af3 <aa382a8b6ed483e9812d0e63b6d1bdcba0186f29; version=a72ce6f84109c1dec1ab236d65979d3250668af3 <aefd0a935625165a6ca36d0258d2d053901555df; version=a72ce6f84109c1dec1ab236d65979d3250668af3 <c5734f9bab6f0d40577ad0633af4090a5fda2407

Published CVSS scores

5.0Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
5.0OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5UbuntuCVSS: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-667Improper Locking
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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