Vulnerability identifier: #VU6651

Vulnerability risk: Medium

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-6214

CWE-ID: CWE-835

Exploitation vector: Network

Exploit availability: No

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

Vendor: Linux Foundation

Description
The vulnerability allows a remote attacker to perform denial of service (DoS) attack.

The vulnerability exists due to an error in tcp_splice_read() function in net/ipv4/tcp.c in Linux kernel before 4.9.11. A remote attacker can send a specially crafted TCP packet with the URG flag and trigger infinite loop.

Successful exploitation of the vulnerability may allow an attacker to perform denial of service (DoS) attack.

Mitigation
Update your kernel to version 4.9.11.

Vulnerable software versions

Linux kernel: 4.9.1 - 4.9.10

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External links
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ccf7abb93af09ad0868ae9...
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.11
http://github.com/torvalds/linux/commit/ccf7abb93af09ad0868ae9033d1ca8108bdaec82

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.