CVE-2026-23557
6.5
MEDIUM
CVSS 3.1
EPSS 0.01%
Description
Any guest can cause xenstored to crash by issuing a XS_RESET_WATCHES command within a transaction due to an assert() triggering. In case xenstored was built with NDEBUG #defined nothing bad will happen, as assert() is doing nothing in this case. Note that the default is not to define NDEBUG for xenstored builds even in release builds of Xen.
How to fix CVE-2026-23557
To remediate CVE-2026-23557, upgrade the affected package to a fixed version below.
- —upgrade to 4.18.5-r7 or later
- —no fix listed
Is CVE-2026-23557 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 4.18.5-r7
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H |