CVE-2024-39292

Kernel compromise via winch IRQ registration race

Published Jun 24, 2024 · Updated Aug 5, 2026

Use-after-free in the User-Mode Linux component of Linux allows local users to crash or compromise its kernel through a console open. register_winch_irq() registers the IRQ before linking the allocated winch into winch_handlers, so an early interrupt leaves a freed object on the global list. Local users with permission to open a UML console or serial device can repeatedly race the path, causing a later panic or memory-control primitives during winch_cleanup().

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the User-Mode Linux component of Linux allows local users to crash or compromise its kernel through a console open. register_winch_irq() registers the IRQ before linking the allocated winch into winch_handlers, so an early interrupt leaves a freed object on the global list. Local users with permission to open a UML console or serial device can repeatedly race the path, causing a later panic or memory-control primitives during winch_cleanup().

The record

CVE
CVE-2024-39292
Published
Jun 24, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=2.6.23
  2. Affected versionversion=42a359e31a0e438b5b978a8f0fecdbd3c86bb033 <0c02d425a2fbe52643a5859a779db0329e7dddd4
  3. Affected versionversion=42a359e31a0e438b5b978a8f0fecdbd3c86bb033 <31960d991e43c8d6dc07245f19fc13398e90ead2
  4. Affected versionversion=42a359e31a0e438b5b978a8f0fecdbd3c86bb033 <351d1a64544944b44732f6a64ed65573b00b9e14
  5. Affected versionversion=42a359e31a0e438b5b978a8f0fecdbd3c86bb033 <434a06c38ee1217a8baa0dd7c37cc85d50138fb0
  6. Affected versionversion=42a359e31a0e438b5b978a8f0fecdbd3c86bb033 <66ea9a7c6824821476914bed21a476cd20094f33
  7. Affected versionversion=42a359e31a0e438b5b978a8f0fecdbd3c86bb033 <73b8e21f76c7dda4905655d2e2c17dc5a73b87f1
  8. Affected versionversion=42a359e31a0e438b5b978a8f0fecdbd3c86bb033 <a0fbbd36c156b9f7b2276871d499c9943dfe5101
  9. Affected versionversion=42a359e31a0e438b5b978a8f0fecdbd3c86bb033 <dc1ff95602ee908fcd7d8acee7a0dadb61b1a0c0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.23; version=42a359e31a0e438b5b978a8f0fecdbd3c86bb033 <0c02d425a2fbe52643a5859a779db0329e7dddd4; version=42a359e31a0e438b5b978a8f0fecdbd3c86bb033 <31960d991e43c8d6dc07245f19fc13398e90ead2; version=42a359e31a0e438b5b978a8f0fecdbd3c86bb033 <351d1a64544944b44732f6a64ed65573b00b9e14; version=42a359e31a0e438b5b978a8f0fecdbd3c86bb033 <434a06c38ee1217a8baa0dd7c37cc85d50138fb0; version=42a359e31a0e438b5b978a8f0fecdbd3c86bb033 <66ea9a7c6824821476914bed21a476cd20094f33; version=42a359e31a0e438b5b978a8f0fecdbd3c86bb033 <73b8e21f76c7dda4905655d2e2c17dc5a73b87f1; version=42a359e31a0e438b5b978a8f0fecdbd3c86bb033 <a0fbbd36c156b9f7b2276871d499c9943dfe5101; version=42a359e31a0e438b5b978a8f0fecdbd3c86bb033 <dc1ff95602ee908fcd7d8acee7a0dadb61b1a0c0

Published CVSS scores

7.8Linux Kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

T1068Exploitation for Privilege Escalation

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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