CVE-2026-23558

HIGH EPSS 2.0%
Published May 19, 20261mo ago · Modified Jun 17, 20262w ago
7.8 CVSS 3.1
High
Find Similar
Published May 19, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

Description

The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window, when a HVM or PVH guest does a grant table version change from v2 to v1 in parallel with mapping the status page(s) via XENMEM_add_to_physmap. Some of the status pages may then be freed while mappings of them would still be inserted into the guest's secondary (P2M) page tables.

CVSS Details

Base Score
7.8
Exploitability
1.1
Impact
6.0
Vector string
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack Vector Local
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Changed
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
2.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-362

Affected Products 1

VendorProductVersionRange
xenxen*≥4.0.0

References 3

  • openwall.com http://www.openwall.com/lists/oss-security/2026/04/28/13
    Mailing ListMitigationPatchThird Party Advisory
  • xenbits.xen.org http://xenbits.xen.org/xsa/advisory-486.html
    MitigationPatchVendor Advisory
  • xenbits.xenproject.org https://xenbits.xenproject.org/xsa/advisory-486.html
    MitigationPatchVendor Advisory

Remediation

  • openwall.com http://www.openwall.com/lists/oss-security/2026/04/28/13
    Mailing ListMitigationPatchThird Party Advisory
  • xenbits.xen.org http://xenbits.xen.org/xsa/advisory-486.html
    MitigationPatchVendor Advisory
  • xenbits.xenproject.org https://xenbits.xenproject.org/xsa/advisory-486.html
    MitigationPatchVendor Advisory