CVE-2026-79603
Fixed in a distro release EPSS <1%CVSS 4.3
x86 PV guests can free memory pages while still keeping a stale TLB entry pointing to them. A TLB flush is only issued by Xen (if needed) when the page is re-used. Since it's possible for the page to be scrubbed ahead of the TLB flush, there's a window where a PV guest can modify an already scrubbed page.
Products: xen
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.21 | xen | 4.19.6-r1 |
| Alpine 3.22 | xen | 4.20.4-r1 |
| Alpine 3.23 | xen | 4.20.4-r1 |
| Alpine 3.24 | xen | 4.21.2-r1 |
| Debian 12 | xen | no fix |
| Debian 13 | xen | 4.20.4+39-gf1e1321c87-0+deb13u1 |
| Debian 14 | xen | 4.20.4+39-gf1e1321c87-1 |
| SUSE Linux Enterprise Micro 5.3 | xen | 4.16.7_14-150400.4.92.1 |
| SUSE Linux Enterprise Micro 5.4 | xen | 4.16.7_14-150400.4.92.1 |
| SUSE Linux Enterprise Micro 5.5 | xen | 4.17.6_16-150500.3.79.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | xen | 4.20.4_04-150700.3.46.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP7 | xen | 4.20.4_04-150700.3.46.1 |
| 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 26.04 LTS | xen | no fix |
| Ubuntu 26.10 | xen | no fix |
| openSUSE Tumbleweed | xen | 4.22.0_04-1.1 |