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Allocation of Resources Without Limits or Throttling The advisory has been revoked - it doesn't affect any version of package xen  (opens in a new tab)

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EPSS
0.38% (30th percentile)

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  • Snyk IDSNYK-UBUNTU1604-XEN-1052953
  • published19 Dec 2020
  • disclosed15 Dec 2020
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Introduced: 15 Dec 2020

CVE-2020-29570  (opens in a new tab)
CWE-770  (opens in a new tab)

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:16.04.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xen package and not the xen package as distributed by Ubuntu.

An issue was discovered in Xen through 4.14.x. Recording of the per-vCPU control block mapping maintained by Xen and that of pointers into the control block is reversed. The consumer assumes, seeing the former initialized, that the latter are also ready for use. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system.