CVE-2022-33745

Description

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.

Related CPE's

o xen xen ******x86 *

o fedoraproject fedora 36 *******

References

https://xenbits.xenproject.org/xsa/advisory-408.txt

Vendor Advisory

http://xenbits.xen.org/xsa/advisory-408.html

PatchVendor Advisory

[oss-security] 20220726 Xen Security Advisory 408 v2 (CVE-2022-33745) - insufficient TLB flush for x86 PV guests in shadow mode

Mailing ListPatchThird Party Advisory

[oss-security] 20220726 Xen Security Advisory 408 v3 (CVE-2022-33745) - insufficient TLB flush for x86 PV guests in shadow mode

Mailing ListPatchThird Party Advisory