CVE-2024-31143Network attack vector

Unspecified host impact via unheld lock release

Published Jul 18, 2024 · Updated Apr 26, 2025

Improper locking in Xen Project Xen Hypervisor 4.4 through 4.15 allows guest OS users to cause unspecified host impact via MSI passthrough. An x86 IRQ-setup error path for consecutive MSI vectors releases a lock even when that path never acquired it. Only guests assigned a multi-vector MSI-capable device can reach the flaw; Xen has not confirmed a specific outcome and does not rule out a host crash, information leakage, or privilege elevation.

CVSS severity7.5
High
EPSS probability0.51%
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 Xen Project Xen Hypervisor 4.4 through 4.15 allows guest OS users to cause unspecified host impact via MSI passthrough. An x86 IRQ-setup error path for consecutive MSI vectors releases a lock even when that path never acquired it. Only guests assigned a multi-vector MSI-capable device can reach the flaw; Xen has not confirmed a specific outcome and does not rule out a host crash, information leakage, or privilege elevation.

The record

CVE
CVE-2024-31143
Published
Jul 18, 2024
Updated
Apr 26, 2025
Vendor
Xen Project
Product
Xen Hypervisor
Classifications
CWE-832, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 26, 2025Record 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=4.4 <4.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Xen Project · Xen Hypervisorversion=4.4 <4.16

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:H/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.

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-832Unlock of a Resource that is not Locked
T1499.004Endpoint Denial of Service: Application 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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