CVE-2026-23555

HIGH 7.1

Xenstored DoS by unprivileged domain

CVSS Score

7.1

EPSS Score

0.0%

EPSS Percentile

4th

Any guest issuing a Xenstore command accessing a node using the (illegal) node path "/local/domain/", will crash xenstored due to a clobbered error indicator in xenstored when verifying the node path. Note that the crash is forced via a failing assert() statement in xenstored. In case xenstored is being built with NDEBUG #defined, an unprivileged guest trying to access the node path "/local/domain/" will result in it no longer being serviced by xenstored, other guests (including dom0) will still be serviced, but xenstored will use up all cpu time it can get.

Vendor	xen
Product	xen
Published	Mar 23, 2026
Last Updated	Mar 23, 2026

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Affected Versions

Xen / Xen

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

xenbits.xenproject.org: https://xenbits.xenproject.org/xsa/advisory-481.html openwall.com: http://www.openwall.com/lists/oss-security/2026/03/17/7 xenbits.xen.org: http://xenbits.xen.org/xsa/advisory-481.html

Credits

This issue was discovered by Marek Marczykowski-Góreckiof Invisible Things Lab.