CVE-2024-31145

HIGH 7.5

error handling in x86 IOMMU identity mapping

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region Reporting, "RMRR") for Intel VT-d or Unity Mapping ranges for AMD-Vi. These are typically used for platform tasks such as legacy USB emulation. Since the precise purpose of these regions is unknown, once a device associated with such a region is active, the mappings of these regions need to remain continuouly accessible by the device. In the logic establishing these mappings, error handling was flawed, resulting in such mappings to potentially remain in place when they should have been removed again. Respective guests would then gain access to memory regions which they aren't supposed to have access to.

Vendor	xen
Product	xen
Published	Sep 25, 2024
Last Updated	Sep 25, 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-460.html xenbits.xen.org: http://xenbits.xen.org/xsa/advisory-460.html openwall.com: http://www.openwall.com/lists/oss-security/2024/08/14/2

Credits

This issue was discovered by Teddy Astie of Vates and diagnosed as a security issue by Jan Beulich of SUSE.