UpHeron
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Servers and applications

CVE-2021-3308

An issue was discovered in Xen 4.12.3 through 4.12.4 and 4.13.1 through 4.14.x. An x86 HVM guest with PCI pass through devices can force the allocation of all IDT vectors on the system by rebooting itself with MSI or MSI-X capabilities enabled and entries setup. Such reboots will leak any vectors used by the MSI(-X) entries that the guest might had enabled, and hence will lead to vector…

Severity
Medium 5.5
Published
26 Jan 2021
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
XenServers and applications · cpe:o:xen:xen
  • Version 4.12.3
  • Version 4.12.4
  • From 4.13.1 up to 4.14.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-3308
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-3308