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FreeBSD: xen-kernel -- x86 software guest page walk PS bit handling flaw (CVE-2016-4480)

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FreeBSD: xen-kernel -- x86 software guest page walk PS bit handling flaw (CVE-2016-4480)

Severity
7
CVSS
(AV:L/AC:L/Au:N/C:C/I:C/A:C)
Published
05/18/2016
Created
07/25/2018
Added
07/20/2016
Modified
10/30/2017

Description

The guest_walk_tables function in arch/x86/mm/guest_walk.c in Xen 4.6.x and earlier does not properly handle the Page Size (PS) page table entry bit at the L4 and L3 page table levels, which might allow local guest OS users to gain privileges via a crafted mapping of memory.

Solution(s)

  • freebsd-upgrade-package-xen-kernel

References

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