xen: The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window, when a HVM...
CVE-2026-23558 is fixed in xen on 1 platform, first by DEBIAN-CVE-2026-23558, released May 19, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| xen · Debian 12.15 (bookworm) | 4.17.7-0+deb12u1 | DEBIAN-CVE-2026-23558 | May 19, 2026 |
| xen · Debian 13.5 (trixie) | 4.20.3+127-gc42374a105-0+deb13u1 | DEBIAN-CVE-2026-23558 | May 19, 2026 |
| xen · Debian 14 | 4.20.3+127-gc42374a105-1 | DEBIAN-CVE-2026-23558 | May 19, 2026 |
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