PT-2026-35870 · Xen+3 · Oxenstored+1

Andrii Sultanov · CVE-2026-23556 · Published 2026-04-28 · Updated 2026-07-09

Positive Technologies (AI Summary)

CVSS v4.0

9.4

Critical

Base vector

AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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

Description An issue occurs when tearing down a domain where node data is cleaned up, but usage counts are leaked. This leads to a situation where a new domain reusing the same domain ID may be deemed over quota after creating fewer nodes than allowed.

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

Improper Preservation of Permissions

Weakness Enumeration

CWE-281

Related Identifiers

CVE-2026-23556

Affected Products

Oxenstored

Xen

References · 12

• https://osv.dev/vulnerability/DEBIAN-CVE-2026-23556 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-23556 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-23556 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-23556 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23556 · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2026-23556 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-23556 · Security Note
• http://openwall.com/lists/oss-security/2026/04/28/10 · Note
• https://xenbits.xen.org/xsa/advisory-483.html · Note
• http://xenbits.xen.org/xsa/advisory-483.html · Note
• https://security.alpinelinux.org/vuln/CVE-2026-23556 · Note
• https://twitter.com/oss_security/status/2049316726613889513 · Twitter Post