MEDIUM 4.7 Microsoft

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.

Microsoft Security Update 2020-May: 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.

Affected Products

References

Published: 2020-05-12 · Source: Microsoft · Feed updated: 2026-08-20
This medium severity vulnerability with a CVSS score of 4.7 was published on 2020-05-12 via Microsoft. Affected: cm1 kernel 5.4.91-3 on CBL Mariner 1.0.
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