Xen Hypervisor Replay Exception Handling Crash
CVE-2025-27465 Published on July 16, 2025
x86: Incorrect stubs exception handling for flags recovery
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.
Vulnerability Analysis
CVE-2025-27465 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a small impact on availability.
Weakness Type
Improper Handling of Exceptional Conditions
The software does not handle or incorrectly handles an exceptional condition.
Products Associated with CVE-2025-27465
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Affected Versions
Xen Version consult Xen advisory XSA-470 is unknown by CVE-2025-27465Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.