CVE-2015-4177

Severity

49%

Complexity

39%

Confidentiality

115%

CWE-476: NULL Pointer Dereference

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.

CWE-476: NULL Pointer Dereference

CVSS 3.0 Base Score 5.5. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

CVSS 2.0 Base Score 4.9. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (AV:L/AC:L/Au:N/C:N/I:N/A:C).

Overview

First reported 8 years ago

2016-05-02 10:59:00

Last updated 8 years ago

2016-05-06 16:44:00

Affected Software

Linux Kernel

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cd4a40174b71acd021877341684d8bb1dc8ea4ae

Vendor Advisory

[oss-security] 20150529 Re: CVE request Linux kernel: ns: user namespaces panic

[oss-security] 20150529 CVE request Linux kernel: ns: user namespaces panic

http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.5

[oss-security] 20150604 Re: Re: CVE request Linux kernel: ns: user namespaces panic

https://bugzilla.redhat.com/show_bug.cgi?id=1248486

https://github.com/torvalds/linux/commit/cd4a40174b71acd021877341684d8bb1dc8ea4ae

Vendor Advisory

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