CVE-2026-23558
Fixed in a distro release EPSS <1%CVSS 7.8
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.
Products: xen
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.20 | xen | 4.18.5-r7 |
| Alpine 3.21 | xen | 4.19.5-r2 |
| Alpine 3.22 | xen | 4.20.3-r2 |
| Alpine 3.23 | xen | 4.20.3-r2 |
| Alpine 3.24 | xen | 4.21.1-r3 |
| Debian 12 | xen | 4.17.7-0+deb12u1 |
| Debian 13 | xen | 4.20.3+127-gc42374a105-0+deb13u1 |
| Debian 14 | xen | 4.20.3+127-gc42374a105-1 |
| Ubuntu 16.04 LTS | xen | no fix |
| Ubuntu 18.04 LTS | xen | no fix |
| Ubuntu 20.04 LTS | xen | no fix |
| Ubuntu 22.04 LTS | xen | no fix |
| Ubuntu 24.04 LTS | xen | no fix |
| Ubuntu 25.10 | xen | no fix |
| Ubuntu 26.04 LTS | xen | no fix |
| Ubuntu 26.10 | xen | no fix |
| openSUSE Tumbleweed | xen | 4.21.1_04-1.1 |