Denial of service in Linux Kernel

1) NULL pointer dereference

EUVDB-ID: #VU11299

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 - NULL Pointer Dereference

Exploit availability: No

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 - 4.14.15

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:4.0.6:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.7.9:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.8.12:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.9.76:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.10.15:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.11.5:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.12.9:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.13.6:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.14.15:*:*:*:*:*:*:*

External links

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

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.