CVE-2020-11742

Description

An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of bad continuation handling in GNTTABOP_copy. Grant table operations are expected to return 0 for success, and a negative number for errors. The fix for CVE-2017-12135 introduced a path through grant copy handling where success may be returned to the caller without any action taken. In particular, the status fields of individual operations are left uninitialised, and may result in errant behaviour in the caller of GNTTABOP_copy. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to copy a grant, it hits the incorrect exit path. This returns success to the caller without doing anything, which may cause crashes or other incorrect behaviour.

How to fix CVE-2020-11742

To remediate CVE-2020-11742, upgrade the affected package to a fixed version below.

• —upgrade to 4.12.2-r1 or later
• —upgrade to 4.11.4-1 or later

Is CVE-2020-11742 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 4.12.2-r1
• from 0, < 4.11.4-1

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2020-11742
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2020-11742