Vulnerability identifier: #VU14202

Vulnerability risk: Low

CVSSv3.1: 5 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-14615

CWE-ID: CWE-120

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 vulnerability exists in the truncate_inline_inode() function, as defined in the fs/f2fs/inline.c source code file of the affected software due to a length value may be negative during unmounting operations on a Flash-Friendly File System (F2FS) image. A local attacker can unmount an F2FS image, trigger a buffer overflow condition and cause the service to crash.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.17 - 4.17.10, 4.16 - 4.16.18, 4.15 - 4.15.18

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External links
http://bugzilla.kernel.org/show_bug.cgi?id=200421

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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. However, proof of concept for this vulnerability is available.