CVE-2024-45819: libxl leaks data to PVH guests via ACPI tables

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-12-19 · updated 2026-06-17
Weakness: CWE-276

Description

PVH guests have their ACPI tables constructed by the toolstack. The construction involves building the tables in local memory, which are then copied into guest memory. While actually used parts of the local memory are filled in correctly, excess space that is being allocated is left with its prior contents.

Affected products

xen: from 4.8.0

References

https://xenbits.xenproject.org/xsa/advisory-464.html
http://www.openwall.com/lists/oss-security/2024/11/12/1
http://www.openwall.com/lists/oss-security/2024/11/12/10
http://www.openwall.com/lists/oss-security/2024/11/12/7
http://xenbits.xen.org/xsa/advisory-464.html

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