CVE-2026-23556 json
oxenstored keeps quota related use counts across domain destruction
published 2026-07-09 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-42600
- cvss
- 9.4
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 3%
- public exploits
- 0
- none known
Summary
When oxenstored is tearing a domain down, the node data is cleaned up but the usage counts are leaked.
When the domain ID is eventually reused, the new domain can create fewer nodes before beeing deemed to be over quota.
Patch / fix
- xen Debian 12 4.17.7-0+deb12u1
- xen Debian 13 4.20.3+127-gc42374a105-0+deb13u1
- xen Debian 14 4.20.3+127-gc42374a105-1
debian advisories DEBIAN-CVE-2026-23556
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 4 mo ago
Exploit prediction
0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.4 | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H |
| CNA | 4.0 | 9.4 | CVSS:4.0/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 |
Affected products
- Xen oxenstored
Classification
- Weakness
-
- CWE-281 Improper Preservation of Permissions
References
Sources
- CVE List CVE-2026-23556
- NVD CVE-2026-23556
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