CVE-2025-38515

System hang via DRM scheduler queue race

Published Aug 16, 2025 · Updated May 11, 2026

Race condition in the Linux kernel DRM scheduler allows local users to halt GPU job scheduling and hang DMA-fence waiters. The queue push can report a non-first job after the run-job worker has idled at a zero job count because the code appends to the SPSC queue before incrementing that count. Exploitation requires low-privilege local access and specific concurrent timing; the race was observed with the Xe driver in an SVM test, and the reported consequence is availability loss only.

CVSS severity4.7
Medium
EPSS probability0.15%
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 Linux kernel DRM scheduler allows local users to halt GPU job scheduling and hang DMA-fence waiters. The queue push can report a non-first job after the run-job worker has idled at a zero job count because the code appends to the SPSC queue before incrementing that count. Exploitation requires low-privilege local access and specific concurrent timing; the race was observed with the Xe driver in an SVM test, and the reported consequence is availability loss only.

The record

CVE
CVE-2025-38515
Published
Aug 16, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 16, 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=27105db6c63a571b91d01e749d026105a1e63bcf <549a9c78c3ea6807d0dc4162a4f5ba59f217d5a0
  2. Affected versionversion=27105db6c63a571b91d01e749d026105a1e63bcf <8af39ec5cf2be522c8eb43a3d8005ed59e4daaee
  3. Affected versionversion=27105db6c63a571b91d01e749d026105a1e63bcf <c64f5310530baf75328292f9b9f3f2961d185183
  4. Affected versionversion=27105db6c63a571b91d01e749d026105a1e63bcf <e2d6547dc8b9b332f9bc00875197287a6a4db65a
  5. Affected versionversion=27105db6c63a571b91d01e749d026105a1e63bcf <e62f51d0ec8a9baf324caf9a564f8e318d36a551
  6. Affected versionversion=27105db6c63a571b91d01e749d026105a1e63bcf <ef58a95457466849fa7b31fd3953801a5af0f58b
  7. Affected versionversion=27105db6c63a571b91d01e749d026105a1e63bcf <ef841f8e4e1ff67817ca899bedc5ebb00847c0a7
  8. Affected versionversion=27105db6c63a571b91d01e749d026105a1e63bcf <f9a4f28a4fc4ee453a92a9abbe36e26224d17749
  9. Affected versionversion=4.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=27105db6c63a571b91d01e749d026105a1e63bcf <549a9c78c3ea6807d0dc4162a4f5ba59f217d5a0; version=27105db6c63a571b91d01e749d026105a1e63bcf <8af39ec5cf2be522c8eb43a3d8005ed59e4daaee; version=27105db6c63a571b91d01e749d026105a1e63bcf <c64f5310530baf75328292f9b9f3f2961d185183; version=27105db6c63a571b91d01e749d026105a1e63bcf <e2d6547dc8b9b332f9bc00875197287a6a4db65a; version=27105db6c63a571b91d01e749d026105a1e63bcf <e62f51d0ec8a9baf324caf9a564f8e318d36a551; version=27105db6c63a571b91d01e749d026105a1e63bcf <ef58a95457466849fa7b31fd3953801a5af0f58b; version=27105db6c63a571b91d01e749d026105a1e63bcf <ef841f8e4e1ff67817ca899bedc5ebb00847c0a7; version=27105db6c63a571b91d01e749d026105a1e63bcf <f9a4f28a4fc4ee453a92a9abbe36e26224d17749; version=4.16

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5OracleCVSS: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 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

T1499.004Application 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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