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Race Condition The advisory has been revoked - it doesn't affect any version of package xen  (opens in a new tab)

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EPSS
0.26% (18th percentile)

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  • Snyk IDSNYK-UBUNTU1604-XEN-1137110
  • published20 Sept 2022
  • disclosed23 Sept 2020
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Introduced: 23 Sep 2020

CVE-2020-25604  (opens in a new tab)
CWE-362  (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. There is a race condition when migrating timers between x86 HVM vCPUs. When migrating timers of x86 HVM guests between its vCPUs, the locking model used allows for a second vCPU of the same guest (also operating on the timers) to release a lock that it didn't acquire. The most likely effect of the issue is a hang or crash of the hypervisor, i.e., a Denial of Service (DoS). All versions of Xen are affected. Only x86 systems are vulnerable. Arm systems are not vulnerable. Only x86 HVM guests can leverage the vulnerability. x86 PV and PVH cannot leverage the vulnerability. Only guests with more than one vCPU can exploit the vulnerability.

References