CVE-2026-23557

MEDIUM EPSS 5.3%
Published May 19, 20261mo ago · Modified Jun 17, 20262w ago
6.5 CVSS 3.1
Medium
Find Similar
Published May 19, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
6.5
Exploitability
2.0
Impact
4.0
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Changed
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
5.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-617

Affected Products 1

VendorProductVersionRange
xenxen*≥4.2.0

References 3

  • openwall.com http://www.openwall.com/lists/oss-security/2026/04/28/11
    Mailing ListPatchThird Party Advisory
  • xenbits.xen.org http://xenbits.xen.org/xsa/advisory-484.html
    PatchVendor Advisory
  • xenbits.xenproject.org https://xenbits.xenproject.org/xsa/advisory-484.html
    PatchVendor Advisory

Remediation

  • openwall.com http://www.openwall.com/lists/oss-security/2026/04/28/11
    Mailing ListPatchThird Party Advisory
  • xenbits.xen.org http://xenbits.xen.org/xsa/advisory-484.html
    PatchVendor Advisory
  • xenbits.xenproject.org https://xenbits.xenproject.org/xsa/advisory-484.html
    PatchVendor Advisory