Bug 2450242 (CVE-2026-23555) - CVE-2026-23555 Xen: Xenstored: Denial of Service via illegal Xenstore node path
Summary: CVE-2026-23555 Xen: Xenstored: Denial of Service via illegal Xenstore node path
Keywords:
Status: NEW
Alias: CVE-2026-23555
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-23 08:01 UTC by OSIDB Bzimport
Modified: 2026-03-23 09:32 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed:
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Description OSIDB Bzimport 2026-03-23 08:01:41 UTC
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.


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