CVE-2026-23557
Xenstored DoS via XS_RESET_WATCHES command
Description
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.
INFO
Published Date :
May 19, 2026, 2:16 p.m.
Last Modified :
May 19, 2026, 2:48 p.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-23557
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-23557.
| URL | Resource |
|---|---|
| https://xenbits.xenproject.org/xsa/advisory-484.html | |
| http://www.openwall.com/lists/oss-security/2026/04/28/11 | |
| http://xenbits.xen.org/xsa/advisory-484.html |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-23557 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-23557
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-23557 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-23557 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
May. 19, 2026
Action Type Old Value New Value Added Description 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. Added Reference https://xenbits.xenproject.org/xsa/advisory-484.html -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
May. 19, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/04/28/11 Added Reference http://xenbits.xen.org/xsa/advisory-484.html