xen: Any guest can cause xenstored to crash by issuing a XS_RESET_WATCHES command within a transaction due to an assert()...
CVE-2026-23557 is fixed in xen on 1 platform, first by DEBIAN-CVE-2026-23557, released May 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| xen · Debian 12.15 (bookworm) | 4.17.7-0+deb12u1 | DEBIAN-CVE-2026-23557 | May 19, 2026 |
| xen · Debian 13.5 (trixie) | 4.20.3+127-gc42374a105-0+deb13u1 | DEBIAN-CVE-2026-23557 | May 19, 2026 |
| xen · Debian 14 | 4.20.3+127-gc42374a105-1 | DEBIAN-CVE-2026-23557 | May 19, 2026 |
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