Vulnerability identifier: #VU12918

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-2017-18270

CWE-ID: CWE-264

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 improper security restrictions during the creation of user keyrings. A local attacker can submit keyctl commands, create keyrings of other users on the system and cause the service to crash.

Mitigation
Update to version 4.13.5.

Vulnerable software versions

Linux kernel: 4.13 - 4.13.4

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External links
http://github.com/torvalds/linux/commit/237bbd29f7a049d310d907f4b2716a7feef9abf3

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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.