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The collect_mounts function in fs/namespace.c in the Linux kernel before 4.0.5 does not properly consider that it may execute after a path has been unmounted, which allows local users to cause a denial of service (system crash) by leveraging user-namespace root access for an MNT_DETACH umount2 system call.
Base Score: 4.9
Impact Score: 6.9
Exploitability Score: 3.9
Base Score: 5.5
Impact Score: 3.6
Exploitability Score: 1.8
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to 4.0.4 (inclusive)