CVE-2019-20794

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.

• CWE-772

• 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

Published

May 9, 2020

Last Modified

Jun 17, 2026

Status

Modified

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