Improper Check for Dropped Privileges Affecting xen package, versions <4.17.2-r1
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Test your applications- Snyk ID SNYK-ALPINE320-XEN-7012568
- published 23 May 2024
- disclosed 5 Jan 2024
Introduced: 5 Jan 2024
CVE-2023-34322 Open this link in a new tabHow to fix?
Upgrade Alpine:3.20 xen to version 4.17.2-r1 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:3.20 relevant fixed versions and status.
For migration as well as to work around kernels unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode. Since Xen itself needs to be mapped when PV guests run, Xen and shadowed PV guests run directly the respective shadow page tables. For 64-bit PV guests this means running on the shadow of the guest root page table.
In the course of dealing with shortage of memory in the shadow pool associated with a domain, shadows of page tables may be torn down. This tearing down may include the shadow root page table that the CPU in question is presently running on. While a precaution exists to supposedly prevent the tearing down of the underlying live page table, the time window covered by that precaution isn't large enough.