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CVE-2026-23558— grant table v2 race in status page mapping

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存在竞争条件问题漏洞，该漏洞源于在HVM或PVH客户机并行进行授权表版本从v2更改为v1和通过XENMEM_add_to_physmap映射状态页时存在竞争窗口，可能导致状态页被释放后仍插入到客户机二级页表中。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
Xen Xen consult Xen advisory XSA-486 unknown
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I. Basic Information for CVE-2026-23558

Vulnerability Information
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Vulnerability Title
grant table v2 race in status page mapping
Source: CVE Program / CVE List V5
Vulnerability 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.
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 竞争条件问题漏洞
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存在竞争条件问题漏洞，该漏洞源于在HVM或PVH客户机并行进行授权表版本从v2更改为v1和通过XENMEM_add_to_physmap映射状态页时存在竞争窗口，可能导致状态页被释放后仍插入到客户机二级页表中。
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-486 -

II. Public POCs for CVE-2026-23558

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III. Intelligence Information for CVE-2026-23558

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Vendor Advisories for CVE-2026-23558 (1)

IV. Related Vulnerabilities

Same product: Xen
Same vendor: Xen

V. Comments for CVE-2026-23558

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