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.

CVSS v3 4.3 MEDIUM

4.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://xenbits.xenproject.org/xsa/advisory-470.html	Patch Vendor Advisory
http://www.openwall.com/lists/oss-security/2025/07/01/1	Mailing List Third Party Advisory
http://xenbits.xen.org/xsa/advisory-470.html	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:*

History

No history.

Information

Published : 2025-07-16 09:15

Updated : 2026-01-13 22:13

NVD link : CVE-2025-27465

Mitre link : CVE-2025-27465

CVE.ORG link : CVE-2025-27465

JSON object : View

Products Affected

xen

xen

CWE

CWE-755

Improper Handling of Exceptional Conditions

{"id": "CVE-2025-27465", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 2.8}]}, "published": "2025-07-16T09:15:23.040", "references": [{"url": "https://xenbits.xenproject.org/xsa/advisory-470.html", "tags": ["Patch", "Vendor Advisory"], "source": "security@xen.org"}, {"url": "http://www.openwall.com/lists/oss-security/2025/07/01/1", "tags": ["Mailing List", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "http://xenbits.xen.org/xsa/advisory-470.html", "tags": ["Patch", "Vendor Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-755"}]}], "descriptions": [{"lang": "en", "value": "Certain instructions need intercepting and emulating by Xen. In some\ncases Xen emulates the instruction by replaying it, using an executable\nstub. Some instructions may raise an exception, which is supposed to be\nhandled gracefully. Certain replayed instructions have additional logic\nto set up and recover the changes to the arithmetic flags.\n\nFor replayed instructions where the flags recovery logic is used, the\nmetadata for exception handling was incorrect, preventing Xen from\nhandling the the exception gracefully, treating it as fatal instead."}, {"lang": "es", "value": "Ciertas instrucciones requieren ser interceptadas y emuladas por Xen. En algunos casos, Xen emula la instrucci\u00f3n repiti\u00e9ndola mediante un stub ejecutable. Algunas instrucciones pueden generar una excepci\u00f3n, que deber\u00eda gestionarse correctamente. Algunas instrucciones repetidas tienen l\u00f3gica adicional para configurar y recuperar los cambios en las banderas aritm\u00e9ticas. En las instrucciones repetidas donde se utiliza la l\u00f3gica de recuperaci\u00f3n de banderas, los metadatos para la gesti\u00f3n de excepciones eran incorrectos, lo que impidi\u00f3 que Xen la gestionara correctamente, trat\u00e1ndola como fatal."}], "lastModified": "2026-01-13T22:13:34.590", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:*", "vulnerable": true, "matchCriteriaId": "6730EA5A-AAE6-4C6F-963C-EBE9E4AA4D48", "versionStartIncluding": "4.9.0"}], "operator": "OR"}]}], "sourceIdentifier": "security@xen.org"}