xen: XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations
CVE-2026-79610 is fixed in xen on 1 platform, first by DEBIAN-CVE-2026-79610, released October 19, 2026. It is not reported as exploited. Patch Radar priority: High.
XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations. Sadly a v2 -> v1 -> v2 change has yet another effect which wasn't accounted for: During the first change, status pages would be freed. During the second change they would be allocated again. Hence across the full pair of change the addresses of the status pages may change, rendering stale previously calculated pointers into the status array.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| xen · Debian 12.15 (bookworm) | 4.17.7+13-g2445b30a44-0+deb12u1 | DEBIAN-CVE-2026-79610 | Oct 19, 2026 |
| xen · Debian 13.5 (trixie) | 4.20.4+39-gf1e1321c87-0+deb13u1 | DEBIAN-CVE-2026-79610 | Oct 19, 2026 |
| xen · Debian 14 | 4.20.4+39-gf1e1321c87-1 | DEBIAN-CVE-2026-79610 | Oct 19, 2026 |
| xen · sles 15.7 | 4.20.4_06-150700.3.49.2 | SUSE-SU-2026:4942-1 | Nov 7, 2026 |
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