CVE-2020-29568 Information

Description

An issue was discovered in Xen through 4.14.x. Some OSes (such as Linux FreeBSD and NetBSD) are processing watch events using a single thread. If the events are received faster than the thread is able to handle they will get queued. As the queue is unbounded a guest may be able to trigger an OOM in the backend. All systems with a FreeBSD Linux or NetBSD (any version) dom0 are vulnerable.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Reference

https://xenbits.xenproject.org/xsa/advisory-349.html https://www.debian.org/security/2021/dsa-4843 https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html https://security.gentoo.org/glsa/202107-30

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

6.5