grant table v2 race in status page mapping_CVE-2026-23558

7.8 / 10

HIGH

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

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.

Basic Information

ID CVE-2026-23558

Source XEN

Published May 19, 2026 at 12:49

Modified May 19, 2026 at 14:36

Affected Product

Vendor Xen

Product Xen

Version consult Xen advisory XSA-486

CWE Classification

CWE-362

References

xenbits.xenproject.org /xsa/advisory-486.html

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    "lastseen": "",
    "description": "The adjustments made for XSA-379 as well as those subsequently becoming\nXSA-387 still left a race window, when a HVM or PVH guest does a grant\ntable version change from v2 to v1 in parallel with mapping the status\npage(s) via XENMEM_add_to_physmap.  Some of the status pages may then be\nfreed while mappings of them would still be inserted into the guest's\nsecondary (P2M) page tables.",
    "published": "2026-05-19T12:49:54.652Z",
    "modified": "2026-05-19T14:36:29.452Z",
    "type": "cve",
    "title": "grant table v2 race in status page mapping",
    "source": "XEN",
    "references": "https://xenbits.xenproject.org/xsa/advisory-486.html",
    "id": "CVE-2026-23558",
    "bulletinFamily": "",
    "cwe": [
        "CWE-362"
    ],
    "cvelist": null,
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    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
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        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
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        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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    "href": "",
    "category_name": "CVE",
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    "product": "Xen",
    "version": "consult Xen advisory XSA-486",
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