CVE-2024-47744

Host hang via KVM lock inversion

Published Oct 21, 2024 · Updated May 11, 2026

Deadlock in the Linux KVM subsystem allows local users to hang the host through rare concurrent virtualization and CPU-hotplug operations. The shared kvm_lock incorrectly guards kvm_usage_count, completing a circular wait across slots_lock, SRCU, and CPU hotplug locking. Triggering requires unusually timed KVM activity, NX huge-page mitigation changes, and CPU online or offline activity; a successful trigger leaves the host deadlocked.

CVSS severity5.5
Medium
EPSS probability0.17%
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 KVM subsystem allows local users to hang the host through rare concurrent virtualization and CPU-hotplug operations. The shared kvm_lock incorrectly guards kvm_usage_count, completing a circular wait across slots_lock, SRCU, and CPU hotplug locking. Triggering requires unusually timed KVM activity, NX huge-page mitigation changes, and CPU online or offline activity; a successful trigger leaves the host deadlocked.

The record

CVE
CVE-2024-47744
Published
Oct 21, 2024
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. Oct 21, 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=0bf50497f03b3d892c470c7d1a10a3e9c3c95821 <44d17459626052a2390457e550a12cb973506b2f
  2. Affected versionversion=0bf50497f03b3d892c470c7d1a10a3e9c3c95821 <4777225ec89f52bb9ca16a33cfb44c189f1b7b47
  3. Affected versionversion=0bf50497f03b3d892c470c7d1a10a3e9c3c95821 <760a196e6dcb29580e468b44b5400171dae184d8
  4. Affected versionversion=0bf50497f03b3d892c470c7d1a10a3e9c3c95821 <a2764afce521fd9fd7a5ff6ed52ac2095873128a
  5. Affected versionversion=6.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0bf50497f03b3d892c470c7d1a10a3e9c3c95821 <44d17459626052a2390457e550a12cb973506b2f; version=0bf50497f03b3d892c470c7d1a10a3e9c3c95821 <4777225ec89f52bb9ca16a33cfb44c189f1b7b47; version=0bf50497f03b3d892c470c7d1a10a3e9c3c95821 <760a196e6dcb29580e468b44b5400171dae184d8; version=0bf50497f03b3d892c470c7d1a10a3e9c3c95821 <a2764afce521fd9fd7a5ff6ed52ac2095873128a; version=6.3

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.6SUSECVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
4.1SUSECVSS:3.1/AV:L/AC:H/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.

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)
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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