CVE-2026-23554
Fixed in a distro release EPSS <1%CVSS 7.8
The Intel EPT paging code uses an optimization to defer flushing of any cached EPT state until the p2m lock is dropped, so that multiple modifications done under the same locked region only issue a single flush. Freeing of paging structures however is not deferred until the flushing is done, and can result in freed pages transiently being present in cached state. Such stale entries can point to memory ranges not owned by the guest, thus allowing access to unintended memory regions.
Products: xen
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.20 | xen | 4.18.5-r5 |
| Alpine 3.21 | xen | 4.19.4-r2 |
| Alpine 3.22 | xen | 4.20.2-r2 |
| Alpine 3.23 | xen | 4.20.2-r2 |
| Alpine 3.24 | xen | 4.21.0-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 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | xen | 4.17.6_06-150500.3.62.2 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | xen | 4.17.6_06-150500.3.62.2 |
| SUSE Linux Enterprise Micro 5.5 | xen | 4.17.6_06-150500.3.62.2 |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | xen | 4.20.2_08-150700.3.28.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP7 | xen | 4.20.2_08-150700.3.28.1 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | xen | 4.17.6_06-150500.3.62.2 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | xen | 4.18.5_12-150600.3.40.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | xen | 4.17.6_06-150500.3.62.2 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | xen | 4.18.5_12-150600.3.40.1 |
| 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 Leap 15.6 | xen | 4.18.5_12-150600.3.40.1 |
| openSUSE Tumbleweed | xen | 4.21.1_02-1.1 |