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Improper Privilege Management Affecting xen package, versions <4.15.1-r1

0.0
high

Snyk CVSS

    Attack Complexity Low
    Scope Changed
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 0.04% (12th percentile)
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NVD
8.8 high

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  • Snyk ID SNYK-ALPINE314-XEN-1924608
  • published 21 Nov 2021
  • disclosed 21 Nov 2021
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Introduced: 21 Nov 2021

CVE-2021-28710 Open this link in a new tab
CWE-269 Open this link in a new tab

How to fix?

Upgrade Alpine:3.14 xen to version 4.15.1-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:3.14 relevant fixed versions and status.

certain VT-d IOMMUs may not work in shared page table mode For efficiency reasons, address translation control structures (page tables) may (and, on suitable hardware, by default will) be shared between CPUs, for second-level translation (EPT), and IOMMUs. These page tables are presently set up to always be 4 levels deep. However, an IOMMU may require the use of just 3 page table levels. In such a configuration the lop level table needs to be stripped before inserting the root table's address into the hardware pagetable base register. When sharing page tables, Xen erroneously skipped this stripping. Consequently, the guest is able to write to leaf page table entries.