CVE-2022-33745
xen - security update
8.8
HIGH
CVSS 3.1
EPSS 0.08%
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.
How to fix CVE-2022-33745
To remediate CVE-2022-33745, upgrade the affected package to a fixed version below.
- —upgrade to 4.14.5-r5 or later
- —upgrade to 4.14.5+86-g1c354767d5-1 or later
- —upgrade to 4.14.5+86-g1c354767d5-1 or later
Is CVE-2022-33745 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 4.14.5-r5
- from 0, < 4.14.5+86-g1c354767d5-1
- from 0, < 4.14.5+86-g1c354767d5-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |