CVE-2024-42135

Service hang via incomplete vhost worker cleanup

Published Jul 30, 2024 · Updated May 11, 2026

Deadlock in the Linux kernel vhost_task subsystem allows local users to hang worker operations by sending SIGKILL to an active worker. When a vhost task receives SIGKILL, vhost_task_fn leaves the worker lingering without marking it killed, detaching its virtqueues, or running queued exit work. A local low-privileged user able to signal an active vhost worker can stall device teardown and interrupt vhost-backed I/O until the device closes.

CVSS severity5.5
Medium
EPSS probability0.23%
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 vhost_task subsystem allows local users to hang worker operations by sending SIGKILL to an active worker. When a vhost task receives SIGKILL, vhost_task_fn leaves the worker lingering without marking it killed, detaching its virtqueues, or running queued exit work. A local low-privileged user able to signal an active vhost worker can stall device teardown and interrupt vhost-backed I/O until the device closes.

The record

CVE
CVE-2024-42135
Published
Jul 30, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-833, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 30, 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=f9010dbdce911ee1f1af1398a24b1f9f992e0080 <abe067dc3a662eef7d5cddbbc41ed50a0b68b0af
  3. Affected versionversion=f9010dbdce911ee1f1af1398a24b1f9f992e0080 <db5247d9bf5c6ade9fd70b4e4897441e0269b233
  4. Affected versionversion=f9010dbdce911ee1f1af1398a24b1f9f992e0080 <dec987fe2df670827eb53b97c9552ed8dfc63ad4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=f9010dbdce911ee1f1af1398a24b1f9f992e0080 <abe067dc3a662eef7d5cddbbc41ed50a0b68b0af; version=f9010dbdce911ee1f1af1398a24b1f9f992e0080 <db5247d9bf5c6ade9fd70b4e4897441e0269b233; version=f9010dbdce911ee1f1af1398a24b1f9f992e0080 <dec987fe2df670827eb53b97c9552ed8dfc63ad4

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.4Red HatCVSS:3.1/AV:L/AC:L/PR:H/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-833Deadlock
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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