CVE-2015-4177

Published: 02/05/2016 Updated: 06/05/2016

CVSS v2 Base Score: 4.9 | Impact Score: 6.9 | Exploitability Score: 3.9

CVSS v3 Base Score: 5.5 | Impact Score: 3.6 | Exploitability Score: 1.8

VMScore: 437

Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C

The collect_mounts function in fs/namespace.c in the Linux kernel prior to 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.

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linux linux kernel

A flaw was discovered in the kernel's collect_mounts function If the kernel's audit subsystem called collect_mounts to audit an unmounted path, it could panic the system With this flaw, an unprivileged user could call umount(MNT_DETACH) to launch a denial-of-service attack ...

NVD-CWE-Other http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cd4a40174b71acd021877341684d8bb1dc8ea4ae http://openwall.com/lists/oss-security/2015/05/29/10 http://openwall.com/lists/oss-security/2015/05/29/5 http://www.openwall.com/lists/oss-security/2015/06/04/5 https://github.com/torvalds/linux/commit/cd4a40174b71acd021877341684d8bb1dc8ea4ae http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.5 https://bugzilla.redhat.com/show_bug.cgi?id=1248486 https://nvd.nist.gov https://access.redhat.com/security/cve/cve-2015-4177

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CVE-2015-4177

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