VDB
CVE-2026-23558
CVE-2026-23558
PUBLISHED
CVSS 7.8 HIGH
grant table v2 race in status page mapping
Reported by xen · Published May 19, 2026
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.
Risk scores
CVSS 3.1
7.8
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Xen | Xen | consult Xen advisory XSA-486 |
| Xen | Xen | * |
Timeline
- Apr 28, 2026 CVE Published
- May 20, 2026 EPSS Score (17 in total, the first dated here)
- May 21, 2026 Security Advisory (5 in total, the first dated here)
- Jul 26, 2026 Coalition ESS Score
- Aug 11, 2026 Distribution Patch (4 in total, the first dated here)
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