PT-2026-26015 · Xen · Xen

Marek Marczykowski · Published 2026-01-01 · Updated 2026-03-28 · CVE-2026-23555

Positive Technologies (AI Summary)

CVSS v3.1

7.1

High

Base vector

AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Xen (affected versions not specified)

Description A guest issuing a Xenstore command accessing a node using the path '/local/domain/' can cause xenstored to crash due to a corrupted error indicator during node path verification. The crash is triggered by a failing assert statement within xenstored. If xenstored is built with NDEBUG defined, an unprivileged guest attempting to access the '/local/domain/' path will no longer be serviced, while other guests, including dom0, will continue to be serviced, but xenstored will consume all available CPU time. The vulnerable path is /local/domain/.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Assertion Failure

Weakness Enumeration

CWE-617

Related Identifiers

CVE-2026-23555

OPENSUSE-SU-2026:10457-1

SUSE-SU-2026:0908-1

SUSE-SU-2026:1093-1

Affected Products

Xen

References · 24

• https://cve.org/CVERecord?id=CVE-2026-23555 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-23555 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-23555 · Security Note
• http://openwall.com/lists/oss-security/2026/03/17/7 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-23555 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:0908-1 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10457-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23555 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-23555 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:1093-1 · Vendor Advisory
• https://xenbits.xenproject.org/xsa/advisory-481.html · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2026-23555 · Vendor Advisory
• http://xenbits.xen.org/xsa/advisory-481.html · Vendor Advisory
• https://twitter.com/oss_security/status/2033992522700079565 · Twitter Post
• https://suse.com/security/cve/CVE-2026-23555 · Note