xen: Any guest issuing a Xenstore command accessing a node using the (illegal) node path "/local/domain/", will crash xens...
CVE-2026-23555 is fixed in xen on 1 platform, first by SUSE-SU-2026:0908-1, released March 17, 2026. It is not reported as exploited. Patch Radar priority: High.
Any guest issuing a Xenstore command accessing a node using the (illegal) node path "/local/domain/", will crash xenstored due to a clobbered error indicator in xenstored when verifying the node path. Note that the crash is forced via a failing assert() statement in xenstored. In case xenstored is being built with NDEBUG #defined, an unprivileged guest trying to access the node path "/local/domain/" will result in it no longer being serviced by xenstored, other guests (including dom0) will still be serviced, but xenstored will use up all cpu time it can get.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| xen · Debian 13.5 (trixie) | 4.20.3+127-gc42374a105-0+deb13u1 | DEBIAN-CVE-2026-23555 | Mar 23, 2026 |
| xen · Debian 14 | 4.20.3+127-gc42374a105-1 | DEBIAN-CVE-2026-23555 | Mar 23, 2026 |
| xen · opensuse-leap 15.6 | 4.18.5_12-150600.3.40.1 | SUSE-SU-2026:0908-1 | Mar 17, 2026 |
| xen · sles 15.6 | 4.18.5_12-150600.3.40.1 | SUSE-SU-2026:0908-1 | Mar 17, 2026 |
| xen · sles 15.7 | 4.20.2_08-150700.3.28.1 | SUSE-SU-2026:1093-1 | Mar 26, 2026 |
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