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CVE-2026-23554— Use after free of paging structures in EPT

Quick assessment

Affected
Xen Xen
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Xen是Xen开源的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。 Xen存在安全漏洞，该漏洞源于Intel EPT分页代码释放未延迟至刷新完成，可能导致已释放页面短暂保留在缓存状态，从而允许访问非预期的内存区域。

AI Predicted 8.6 Difficulty: Hard EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1564.008 · Email Hiding Rules
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I. Basic Information for CVE-2026-23554

Vulnerability Information
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Vulnerability Title
Use after free of paging structures in EPT
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Xen 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xen是Xen开源的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。 Xen存在安全漏洞，该漏洞源于Intel EPT分页代码释放未延迟至刷新完成，可能导致已释放页面短暂保留在缓存状态，从而允许访问非预期的内存区域。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Xen Xen consult Xen advisory XSA-480 -

II. Public POCs for CVE-2026-23554

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III. Intelligence Information for CVE-2026-23554

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Vendor Advisories for CVE-2026-23554 (1)

IV. Related Vulnerabilities

Same product: Xen
Same vendor: Xen

V. Comments for CVE-2026-23554

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