Allocation of Resources Without Limits or Throttling Affecting xen package, versions <4.14.3+32-g9de3671772-1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.43% (76th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-XEN-1925385
  • published24 Nov 2021
  • disclosed24 Nov 2021

Introduced: 24 Nov 2021

CVE-2021-28706  (opens in a new tab)
CWE-770  (opens in a new tab)

How to fix?

Upgrade Debian:unstable xen to version 4.14.3+32-g9de3671772-1 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 Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB of memory, it may be able to issue hypercalls to increase its memory allocation beyond the administrator established limit. This is a result of a calculation done with 32-bit precision, which may overflow. It would then only be the overflowed (and hence small) number which gets compared against the established upper bound.

CVSS Scores

version 3.1