Vulnerability identifier: #VU6394

Vulnerability risk: Low

CVSSv3.1: 3.9 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-8632

CWE-ID: CWE-121

Exploitation vector: Local

Exploit availability: No

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

Vendor: Linux Foundation

Description

The vulnerability allows a local user to cause kernel panic or escalate privileges.

The vulnerability exists due to a boundary error during minimum bearer MTU check within the tipc_msg_build() function. A local user can set a very short MTU, trigger stack-based buffer overflow and cause kernel panic or execute arbitrary code on the target system with elevated privileges.

Successful exploitation of the vulnerability may allow an attacker to cause kernel panic or escalate privileges on the system.

Mitigation
Update to version 4.8.14 or 4.4.65.

Vulnerable software versions

Linux kernel: 4.4.64, 4.8.13, 4.1.1 - 4.1.36

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External links
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.14
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.65
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.1.37

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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.