Instruction Emulation Flaw in Xen Hypervisor
CVE-2025-27465

4.3MEDIUM

Key Information:

Vendor

Xen Project
Status
Xen Project
Vendor
CVE Published:
16 July 2025

What is CVE-2025-27465?

A flaw exists in the instruction emulation logic of the Xen Hypervisor, where certain replayed instructions do not handle exceptions as expected. When the arithmetic flags recovery logic is triggered, the metadata involved in exception handling is incorrect, leading to failures in graceful exception management. As a result, what should have been a handled exception is treated as fatal, potentially compromising the stability of the system. This highlights the need for careful review and updates to ensure the integrity and reliability of the Xen Hypervisor.

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Deploy the Patch

Affected Version(s)

Xen consult Xen advisory XSA-470

References

https://xenbits.xenproject.org/xsa/advisory-470.html

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was discovered by Andrew Cooper of XenServer.
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