High severity7.8NVD Advisory· Published May 19, 2026· Updated May 19, 2026
CVE-2026-23558
CVE-2026-23558
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.
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Affected products
2Patches
Vulnerability mechanics
References
3- www.openwall.com/lists/oss-security/2026/04/28/13nvdMailing ListMitigationPatchThird Party Advisory
- xenbits.xen.org/xsa/advisory-486.htmlnvdMitigationPatchVendor Advisory
- xenbits.xenproject.org/xsa/advisory-486.htmlnvdMitigationPatchVendor Advisory
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