#VU10770 Denial of service in Linux kernel - CVE-2017-18200

Vulnerability identifier: #VU10770

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-18200

CWE-ID: CWE-20

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 ob the target system.

The weakness exists in the Flash-Friendly File System (F2FS) implementation due to the improper handling of reference counts that are associated with f2fs_wait_discard_bios calls. A remote attacker can send a specially crafted fstrim command and cause a kernel panic.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.10 - 4.13.6

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External links
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=638164a2718f337ea224b7...

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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.