sargun/fuse-example

sargun/fuse-example

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An Example FUSE Filesystem Turned into an Exploit Vector
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CVE History

CVEPublishedCVSS v3CVSS v2
CVE-2019-20794↗
4.7 MEDIUM4.7 MEDIUM

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.