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.
References (4)
Scores
CVSS v3
4.7
EPSS
0.0009
EPSS Percentile
25.9%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-772
Status
published
Products (1)
linux/linux_kernel
4.18 - 5.6.11
Published
May 09, 2020
Tracked Since
Feb 18, 2026