CVE-2019-20794

MediumCVSS 4.7/10Last modified Oct 8, 2026

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.

Metrics

CVSS 3.1 4.7/10CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-772

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

http://www.openwall.com/lists/oss-security/2020/08/24/1Mailing List, Third Party Advisory
https://github.com/sargun/fuse-exampleExploit, Third Party Advisory
https://security.netapp.com/advisory/ntap-20200608-0001/Third Party Advisory
https://sourceforge.net/p/fuse/mailman/message/36598753/Exploit, Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/08/24/1Mailing List, Third Party Advisory
https://github.com/sargun/fuse-exampleExploit, Third Party Advisory
https://security.netapp.com/advisory/ntap-20200608-0001/Third Party Advisory
https://sourceforge.net/p/fuse/mailman/message/36598753/Exploit, Third Party Advisory

Timeline

Published: May 9, 2020
Last modified: Oct 8, 2026
NVD status: Modified

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