Reachable assertion in Xen - CVE-2026-23557
Published: April 28, 2026
Vulnerability identifier: #VU128378
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-23557
CWE-ID: CWE-617
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Xen
Xen
Software vendor:
Xen Project
Xen Project
Description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an assertion failure in xenstored when processing an XS_RESET_WATCHES command within a transaction. A remote attacker can issue a crafted XS_RESET_WATCHES command within a transaction to cause a denial of service.
Only systems using the C variant of xenstored or xenstore-stubdom built without NDEBUG are vulnerable.
Remediation
Install security update from vendor's website.