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.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://xenbits.xenproject.org/xsa/advisory-484.html Patch, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/04/28/11 Mailing List, Patch, Third Party Advisory
- http://xenbits.xen.org/xsa/advisory-484.html Patch, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 6.5 · xenNVD modified 2026-10-14 20:10
Affected (CPE criteria) 1
cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*
References 3
- https://xenbits.xenproject.org/xsa/advisory-484.html Patch, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/04/28/11 Mailing List, Patch, Third Party Advisory
- http://xenbits.xen.org/xsa/advisory-484.html Patch, Vendor Advisory