Vulnerability identifier: #VU11299

Vulnerability risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-18216

CWE-ID: CWE-476

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description
The vulnerability allows a local attacker to cause DoS condition on the target system.

The weakness exists due to the affected software does not use the subsystem.su_mutex component while accessing an item->ci_parent. A local attacker can trigger NULL pointer dereference in in the fs/ocfs2/cluster/nodemanager.c source code file cause the service to crash.

Mitigation
Update to version 4.15.

Vulnerable software versions

Linux kernel: 4.0 - 4.0.6, 4.7 - 4.7.9, 4.8 - 4.8.12, 4.9 - 4.9.76, 4.10.0 - 4.10.15, 4.11 - 4.11.5, 4.12 - 4.12.9, 4.13 - 4.13.6, 4.14.0 - 4.14.15

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External links
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=853bc26a7ea39e354b9f88...

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.