CVE-2024-45817

HIGH 7.3

x86: Deadlock in vlapic_error()

CVSS Score

7.3

EPSS Score

0.0%

EPSS Percentile

0th

In x86's APIC (Advanced Programmable Interrupt Controller) architecture, error conditions are reported in a status register. Furthermore, the OS can opt to receive an interrupt when a new error occurs. It is possible to configure the error interrupt with an illegal vector, which generates an error when an error interrupt is raised. This case causes Xen to recurse through vlapic_error(). The recursion itself is bounded; errors accumulate in the the status register and only generate an interrupt when a new status bit becomes set. However, the lock protecting this state in Xen will try to be taken recursively, and deadlock.

Vendor	xen
Product	xen
Published	Sep 25, 2024
Last Updated	Nov 20, 2024

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Affected Versions

Xen / Xen

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

xenbits.xenproject.org: https://xenbits.xenproject.org/xsa/advisory-462.html xenbits.xen.org: http://xenbits.xen.org/xsa/advisory-462.html openwall.com: http://www.openwall.com/lists/oss-security/2024/09/24/1

Credits

This issue was discovered after a BUGSENG team working on MISRA C compliance of Xen pointed attention to ECLAIR reports for MISRA C Rule 17.2 (Functions shall not call themselves, either directly or indirectly).