xen: HVM guest I/O port accesses are subject to either emulation or at least translation
CVE-2026-42487 is fixed in xen on 1 platform, first by SUSE-SU-2026:2329-1, released June 10, 2026. It is not reported as exploited. Patch Radar priority: High.
HVM guest I/O port accesses are subject to either emulation or at least translation. Translations are managed by the device model (via XEN_DOMCTL_ioport_mapping), and hence the linked list used may changed at any time. Traversal of those lists (while handling guest I/O port accesses) therefore needs synchronizing with updates, which was missing so far.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| xen · Debian 12.15 (bookworm) | 4.17.7-0+deb12u1 | DEBIAN-CVE-2026-42487 | Jun 18, 2026 |
| xen · Debian 13.5 (trixie) | 4.20.3+127-gc42374a105-0+deb13u1 | DEBIAN-CVE-2026-42487 | Jun 18, 2026 |
| xen · Debian 14 | 4.20.3+127-gc42374a105-1 | DEBIAN-CVE-2026-42487 | Jun 18, 2026 |
| xen · sles 15.6 | 4.18.5_18-150600.3.50.1 | SUSE-SU-2026:2329-1 | Jun 10, 2026 |
| xen · sles 15.7 | 4.20.3_06-150700.3.41.1 | SUSE-SU-2026:2364-1 | Jun 11, 2026 |
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