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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.

🗓️ 25 Sep 2020 07:00:00Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 3 Views

Unprivileged user namespaces can mount a FUSE filesystem; killing PID 1 can hang tasks and lock resources.

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25 Sep 2020 07:00Current
7High risk
Vulners AI Score7
CVSS 3.14.7
CVSS 24.7
EPSS0.00093
3