Vulnerability in Xen
CVE-2025-27465
Certain instructions need intercepting and emulating by Xen. In some cases Xen emulates the instruction by replaying it, using an executable stub. Some instructions may raise an exception, which is supposed to be handled gracefully. Certain replayed instructions have additional logic to set up and recover the changes to the arithmetic flags. For replayed instructions where the flags recovery logic is used, the metadata for exception handling was incorrect, preventing Xen from handling the the exception gracefully, treating it as fatal instead.
EPSS: 0.006 (43.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Xen — versions consult Xen advisory XSA-470
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@xen.org (Patch, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-27465?
- CVE-2025-27465 is a medium-severity vulnerability in Xen, classified under Improper Handling of Exceptional Conditions. CVSS score: 4.3/10. Published 2025-07-16.
- How severe is CVE-2025-27465?
- Medium severity. CVSS v3 base score is 4.3 out of 10.
- Is CVE-2025-27465 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.