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CVE-2022-33745 Affecting xen package, versions <4.15.3-r2

0.0
high

Snyk CVSS

    Attack Complexity Low
    Scope Changed
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 0.05% (14th percentile)
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NVD
8.8 high
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SUSE
7.5 high

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  • Snyk ID SNYK-ALPINE315-XEN-2963337
  • published 30 Jul 2022
  • disclosed 26 Jul 2022
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Introduced: 26 Jul 2022

CVE-2022-33745 Open this link in a new tab

How to fix?

Upgrade Alpine:3.15 xen to version 4.15.3-r2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xen package and not the xen package as distributed by Alpine. See How to fix? for Alpine:3.15 relevant fixed versions and status.

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.