CVE-2026-23554

HIGH EPSS 2.8%
Published Mar 23, 20263mo ago · Modified Jun 17, 20262w ago
7.8 CVSS 3.1
High
Find Similar
Published Mar 23, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

Description

The Intel EPT paging code uses an optimization to defer flushing of any cached EPT state until the p2m lock is dropped, so that multiple modifications done under the same locked region only issue a single flush. Freeing of paging structures however is not deferred until the flushing is done, and can result in freed pages transiently being present in cached state. Such stale entries can point to memory ranges not owned by the guest, thus allowing access to unintended memory regions.

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
2.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-367

Affected Products 1

VendorProductVersionRange
xenxen*≥4.17

References 3

  • openwall.com http://www.openwall.com/lists/oss-security/2026/03/17/6
    Mailing ListPatchThird Party Advisory
  • xenbits.xen.org http://xenbits.xen.org/xsa/advisory-480.html
    PatchVendor Advisory
  • xenbits.xenproject.org https://xenbits.xenproject.org/xsa/advisory-480.html
    PatchVendor Advisory

Remediation

  • openwall.com http://www.openwall.com/lists/oss-security/2026/03/17/6
    Mailing ListPatchThird Party Advisory
  • xenbits.xen.org http://xenbits.xen.org/xsa/advisory-480.html
    PatchVendor Advisory
  • xenbits.xenproject.org https://xenbits.xenproject.org/xsa/advisory-480.html
    PatchVendor Advisory