CVE-2026-23555 — Xenstored DoS by unprivileged domain

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Xen / Xen	unknown consult Xen advisory XSA-481

CWE

No CWE identifiers supplied.

References

https://xenbits.xenproject.org/xsa/advisory-481.html

ADP enrichment

CVE

No English description supplied.

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

CISA-ADP

No English description supplied.

No references supplied.