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The handling of Xen events in the Linux kernel runs with interrupts disabled in a loop until no further event is pending. Whenever an event has been accepted by the kernel, another event can come in via the same event channel. This can result in the event handling loop running for an extended time if new events are coming in at a high rate. In extreme cases this can lead to a complete hang of the kernel, resulting in a DoS situation of the host when dom0 is affected. |
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An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. Guest OS users can cause a denial of service (host OS hang) via a high rate of events to dom0, aka CID-e99502f76271. |
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