xen: The Intel EPT paging code uses an optimization to defer flushing of any cached EPT state until the p2m lock is droppe...
CVE-2026-23554 is fixed in xen on 1 platform, first by SUSE-SU-2026:0908-1, released March 17, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| xen · Debian 12.15 (bookworm) | 4.17.7-0+deb12u1 | DEBIAN-CVE-2026-23554 | Mar 23, 2026 |
| xen · Debian 13.5 (trixie) | 4.20.3+127-gc42374a105-0+deb13u1 | DEBIAN-CVE-2026-23554 | Mar 23, 2026 |
| xen · Debian 14 | 4.20.3+127-gc42374a105-1 | DEBIAN-CVE-2026-23554 | Mar 23, 2026 |
| xen · opensuse-leap 15.6 | 4.18.5_12-150600.3.40.1 | SUSE-SU-2026:0908-1 | Mar 17, 2026 |
| xen · sles 15.6 | 4.18.5_12-150600.3.40.1 | SUSE-SU-2026:0908-1 | Mar 17, 2026 |
| xen · sles 15.7 | 4.20.2_08-150700.3.28.1 | SUSE-SU-2026:1093-1 | Mar 26, 2026 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.