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CVE-2020-29566

Status Candidate

Overview

An issue was discovered in Xen through 4.14.x. When they require assistance from the device model, x86 HVM guests must be temporarily de-scheduled. The device model will signal Xen when it has completed its operation, via an event channel, so that the relevant vCPU is rescheduled. If the device model were to signal Xen without having actually completed the operation, the de-schedule / re-schedule cycle would repeat. If, in addition, Xen is resignalled very quickly, the re-schedule may occur before the de-schedule was fully complete, triggering a shortcut. This potentially repeating process uses ordinary recursive function calls, and thus could result in a stack overflow. A malicious or buggy stubdomain serving a HVM guest can cause Xen to crash, resulting in a Denial of Service (DoS) to the entire host. Only x86 systems are affected. Arm systems are not affected. Only x86 stubdomains serving HVM guests can exploit the vulnerability.

Related Files

Gentoo Linux Security Advisory 202107-30
Posted Jul 13, 2021
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202107-30 - Multiple vulnerabilities have been found in Xen, the worst of which could result in privilege escalation. Versions less than 4.15.0-r1 are affected.

tags | advisory, vulnerability
systems | linux, gentoo
advisories | CVE-2020-29479, CVE-2020-29486, CVE-2020-29487, CVE-2020-29566, CVE-2020-29567, CVE-2020-29568, CVE-2020-29569, CVE-2020-29570, CVE-2020-29571, CVE-2021-0089, CVE-2021-26313, CVE-2021-28687, CVE-2021-28690, CVE-2021-28691, CVE-2021-28692, CVE-2021-28693, CVE-2021-3308
SHA-256 | 36d5f476b51c23defc6f7d17ba7518ef98181a7154a78a23daa94e2802513ab7
Debian Security Advisory 4812-1
Posted Dec 28, 2020
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4812-1 - Multiple vulnerabilities have been discovered in the Xen hypervisor.

tags | advisory, vulnerability
systems | linux, debian
advisories | CVE-2020-29479, CVE-2020-29480, CVE-2020-29481, CVE-2020-29482, CVE-2020-29483, CVE-2020-29484, CVE-2020-29485, CVE-2020-29486, CVE-2020-29566, CVE-2020-29570, CVE-2020-29571
SHA-256 | 37919a1fdf97980cfdebe6aa11ee31f4bf0b9ebf838344befc1d3a7c22df1c49
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