CVE-2024-31143

double unlock in x86 guest IRQ handling

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.

Remediation

Workaround:

  • Not passing through multi-vector MSI capable devices to x86 guests will avoid the vulnerability.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.20%
Affected: Xen Xen
Published at:
Updated at:

References

Link Tags
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

Frequently Asked Questions

What is the severity of CVE-2024-31143?
CVE-2024-31143 has been scored as a high severity vulnerability.
How to fix CVE-2024-31143?
As a workaround for remediating CVE-2024-31143: Not passing through multi-vector MSI capable devices to x86 guests will avoid the vulnerability.
Is CVE-2024-31143 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2024-31143 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-31143?
CVE-2024-31143 affects Xen Xen.
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