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FreeBSD: VID-5D91370B-61FD-11EB-B87A-901B0EF719AB (CVE-2020-29568): FreeBSD -- Xen guests can triger backend Out Of Memory

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FreeBSD: VID-5D91370B-61FD-11EB-B87A-901B0EF719AB (CVE-2020-29568): FreeBSD -- Xen guests can triger backend Out Of Memory

Severity
5
CVSS
(AV:L/AC:L/Au:N/C:N/I:N/A:C)
Published
12/15/2020
Created
02/02/2021
Added
01/30/2021
Modified
01/30/2021

Description

An issue was discovered in Xen through 4.14.x. Some OSes (such as Linux, FreeBSD, and NetBSD) are processing watch events using a single thread. If the events are received faster than the thread is able to handle, they will get queued. As the queue is unbounded, a guest may be able to trigger an OOM in the backend. All systems with a FreeBSD, Linux, or NetBSD (any version) dom0 are vulnerable.

Solution(s)

  • freebsd-upgrade-base-11_4-release-p7
  • freebsd-upgrade-base-12_1-release-p13
  • freebsd-upgrade-base-12_2-release-p3

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