CVE-2025-27465
In some cases Xen emulates the instruction by replaying it, using an executable stub.
Does this matter?
Lower severity and a low EPSS score (0.60%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
- EPSS
- 0.60% probability · 47th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-755
- Affected
- xen/xen
- Source
- security@xen.org
References
- https://xenbits.xenproject.org/xsa/advisory-470.htmlPatch, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2025/07/01/1Mailing List, Third Party Advisory
- http://xenbits.xen.org/xsa/advisory-470.htmlPatch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.