xen: When oxenstored is tearing a domain down, the node data is cleaned up but the usage counts are leaked
CVE-2026-23556 is fixed in xen on 1 platform, first by DEBIAN-CVE-2026-23556, released August 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| xen · Debian 12.15 (bookworm) | 4.17.7-0+deb12u1 | DEBIAN-CVE-2026-23556 | Aug 3, 2026 |
| xen · Debian 13.5 (trixie) | 4.20.3+127-gc42374a105-0+deb13u1 | DEBIAN-CVE-2026-23556 | Aug 3, 2026 |
| xen · Debian 14 | 4.20.3+127-gc42374a105-1 | DEBIAN-CVE-2026-23556 | Aug 3, 2026 |
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