CVE-2022-33745: Debian Linux

High severity, CVSS 8.8. EPSS: 0.3% chance of exploitation in the next 30 days.

insufficient TLB flush for x86 PV guests in shadow mode For migration as well as to work around kernels unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode. To address XSA-401, code was moved inside a function in Xen. This code movement missed a variable changing meaning / value between old and new code positions. The now wrong use of the variable did lead to a wrong TLB flush condition, omitting flushes where such are necessary.

Affected products

• Debian Debian Linux: version 11.0 only
• Fedoraproject Fedora: version 35 only; version 36 only
• Xen Xen: any version

Published 2022-07-26. Last modified 2026-06-17.