CVE-2024-35991

Kernel warning via spinlocked workqueue drain

Published May 20, 2024 · Updated May 11, 2026

Improper locking in Linux 6.4 allows attackers to trigger an IDXD event-log workqueue call trace during concurrent operations. The IDXD event-log path holds a spinlock while drain_workqueue() can reschedule, so queue_work() can enqueue work onto a draining queue. Reachability requires the IDXD driver and overlapping drain and queue operations; the published record reports a kernel warning and does not establish a crash or privilege gain.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
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 Linux 6.4 allows attackers to trigger an IDXD event-log workqueue call trace during concurrent operations. The IDXD event-log path holds a spinlock while drain_workqueue() can reschedule, so queue_work() can enqueue work onto a draining queue. Reachability requires the IDXD driver and overlapping drain and queue operations; the published record reports a kernel warning and does not establish a crash or privilege gain.

The record

CVE
CVE-2024-35991
Published
May 20, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. May 20, 2024CVE 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=6.4
  2. Affected versionversion=c40bd7d9737bdcfb02d42765bc6c59b338151123 <758071a35d9f3ffd84ff12169d081412a2f5f098
  3. Affected versionversion=c40bd7d9737bdcfb02d42765bc6c59b338151123 <c9b732a9f73eadc638abdcf0a6d39bc7a0c1af5f
  4. Affected versionversion=c40bd7d9737bdcfb02d42765bc6c59b338151123 <d5638de827cff0fce77007e426ec0ffdedf68a44

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=c40bd7d9737bdcfb02d42765bc6c59b338151123 <758071a35d9f3ffd84ff12169d081412a2f5f098; version=c40bd7d9737bdcfb02d42765bc6c59b338151123 <c9b732a9f73eadc638abdcf0a6d39bc7a0c1af5f; version=c40bd7d9737bdcfb02d42765bc6c59b338151123 <d5638de827cff0fce77007e426ec0ffdedf68a44

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking

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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