What’s Vulnerable › Vulnerabilities

CVE-2025-27465: x86: Incorrect stubs exception handling for flags recovery

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-16 · updated 2026-06-17
• Weakness: CWE-755

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.

Affected products

• xen: from 4.9.0

References

• https://xenbits.xenproject.org/xsa/advisory-470.html
• http://www.openwall.com/lists/oss-security/2025/07/01/1
• http://xenbits.xen.org/xsa/advisory-470.html

Get alerted when CVE-2025-27465 or the next vulnerability affects your stack