CVE-2026-23557
Fixed in a distro release EPSS <1%CVSS 6.5
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.
Products: xen
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.20 | xen | 4.18.5-r7 |
| Alpine 3.21 | xen | 4.19.5-r2 |
| Alpine 3.22 | xen | 4.20.3-r2 |
| Alpine 3.23 | xen | 4.20.3-r2 |
| Alpine 3.24 | xen | 4.21.1-r3 |
| Debian 12 | xen | 4.17.7-0+deb12u1 |
| Debian 13 | xen | 4.20.3+127-gc42374a105-0+deb13u1 |
| Debian 14 | xen | 4.20.3+127-gc42374a105-1 |
| Ubuntu 16.04 LTS | xen | no fix |
| Ubuntu 18.04 LTS | xen | no fix |
| Ubuntu 20.04 LTS | xen | no fix |
| Ubuntu 22.04 LTS | xen | no fix |
| Ubuntu 24.04 LTS | xen | no fix |
| Ubuntu 25.10 | xen | no fix |
| Ubuntu 26.04 LTS | xen | no fix |
| Ubuntu 26.10 | xen | no fix |
| openSUSE Tumbleweed | xen | 4.21.1_04-1.1 |