Any guest can cause xenstored to crash by issuing a XS_RESET_WATCHES command within a transaction due to an assert() triggering.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. May 19, 2026 · NIST NVD

   Detected

   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.

2. Oct 14, 2026 · NIST NVD

   Updated

   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.

Affected

• cpe xen/xenversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-23557

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-23557

  30-day exploitation probability 0.2%

  first.org
• NIST NVDVulnerability recordCVE-2026-23557

  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 d

  nvd.nist.gov

References

• Mailing List · openwall.com
• Patch · xenbits.xen.org
• Patch · xenbits.xenproject.org