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CVE-2021-3308

Status Candidate

Overview

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 exhaustion on the system, not allowing further PCI pass through devices to work properly. HVM guests with PCI pass through devices can mount a Denial of Service (DoS) attack affecting the pass through of PCI devices to other guests or the hardware domain. In the latter case, this would affect the entire host.

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
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