Vulnerability identifier: #VU5869

Vulnerability risk: Low

CVSSv3.1: 6.4 [CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2017-6074

CWE-ID: CWE-399

Exploitation vector: Local

Exploit availability: Yes

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

Vendor: Linux Foundation

Description

The vulnerability allows a local user to cause kernel panic.

The vulnerability exists due to invalid free in the dccp_rcv_state_process() function in net/dccp/input.c file in the Linux kernel through 4.9.11 when processing DCCP_PKT_REQUEST packet data structures in the LISTEN state. A local user can use userspace application to make an IPV6_RECVPKTINFO setsockopt system call and cause kernel panic.

Successful exploitation of this vulnerability may result in denial of service condition.

Mitigation
Install patch from GIT repository.

Vulnerable software versions

Linux kernel: 4.9.1 - 4.9.11, 4.8.0 - 4.8.17, 4.7.0 - 4.7.10, 4.6.0 - 4.6.7, 4.5.0 - 4.5.7, 4.4.0 - 4.4.50, 4.3.1 - 4.3.6, 4.2.0 - 4.2.8, 4.1.1 - 4.1.38

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External links
http://github.com/torvalds/linux/commit/5edabca9d4cff7f1f2b68f0bac55ef99d9798ba4

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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.