# CVE-2026-23555: 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.

- Web page: https://patchblox.com/security/cve/CVE-2026-23555
- Priority: High
- CVSS: 7.1 (high)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 17, 2026

## Description

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

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xen Debian 13.5 (trixie) | 4.20.3+127-gc42374a105-0+deb13u1 | [DEBIAN-CVE-2026-23555](https://patchblox.com/security/data/fix/linux/debian-cve-2026-23555.md) | Mar 23, 2026 |
| Linux | xen Debian 14 | 4.20.3+127-gc42374a105-1 | [DEBIAN-CVE-2026-23555](https://patchblox.com/security/data/fix/linux/debian-cve-2026-23555.md) | Mar 23, 2026 |
| Linux | xen opensuse-leap 15.6 | 4.18.5_12-150600.3.40.1 | [SUSE-SU-2026:0908-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0908-1.md) | Mar 17, 2026 |
| Linux | xen sles 15.6 | 4.18.5_12-150600.3.40.1 | [SUSE-SU-2026:0908-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0908-1.md) | Mar 17, 2026 |
| Linux | xen sles 15.7 | 4.20.2_08-150700.3.28.1 | [SUSE-SU-2026:1093-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1093-1.md) | Mar 26, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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