CVE-2025-27465

NameCVE-2025-27465
DescriptionCertain 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
xen (PTS)bullseye4.14.6-1vulnerable
bullseye (security)4.14.5+94-ge49571868d-1vulnerable
bookworm4.17.5+23-ga4e5191dc0-1+deb12u1vulnerable
bookworm (security)4.17.5+23-ga4e5191dc0-1vulnerable
forky, sid, trixie4.20.0+68-g35cb38b222-1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
xensourcebullseye(unfixed)end-of-life
xensource(unstable)(unfixed)

Notes

[bullseye] - xen <end-of-life> (EOLed in Bullseye)
https://xenbits.xen.org/xsa/advisory-470.html

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