CVE-2019-20794 Information

Description

An issue was discovered in the Linux kernel 4.18 through 5.6.11 when unprivileged user namespaces are allowed. A user can create their own PID namespace and mount a FUSE filesystem. Upon interaction with this FUSE filesystem if the userspace component is terminated via a kill of the PID namespace’s pid 1 it will result in a hung task and resources being permanently locked up until system reboot. This can result in resource exhaustion.

CVSS Vector

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

Reference

http://www.openwall.com/lists/oss-security/2020/08/24/1 https://github.com/sargun/fuse-example https://security.netapp.com/advisory/ntap-20200608-0001/ https://sourceforge.net/p/fuse/mailman/message/36598753/

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

4.7