CVE-2024-31143: double unlock in x86 guest IRQ handling

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-07-18 · updated 2026-06-17
Weakness: CWE-832

Description

An optional feature of PCI MSI called "Multiple Message" allows a device to use multiple consecutive interrupt vectors. Unlike for MSI-X, the setting up of these consecutive vectors needs to happen all in one go. In this handling an error path could be taken in different situations, with or without a particular lock held. This error path wrongly releases the lock even when it is not currently held.

Affected products

xen: from 4.4.0

References

https://xenbits.xenproject.org/xsa/advisory-458.html
http://www.openwall.com/lists/oss-security/2024/07/16/3
http://xenbits.xen.org/xsa/advisory-458.html
https://xenbits.xenproject.org/xsa/advisory-458.html

Get alerted when CVE-2024-31143 or the next vulnerability affects your stack