#VU8922 Divide by zero in Linux kernel and linux_kernel (Debian package) - CVE-2017-14106

Vulnerability identifier: #VU8922

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-2017-14106

CWE-ID: CWE-369

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system
linux_kernel (Debian package)
Operating systems & Components / Operating system package or component

Vendor: Linux Foundation
Debian

Description
The vulnerability allows a local attacker to cause DoS condition on the target system.

The weakness exists due to divide-by-zero error in the tcp_disconnect() function in net/ipv4/tcp.c. A local attacker can trigger a disconnect within a certain tcp_recvmsg code path and cause kernel panic.

Successful exploitation of the vulnerability results in denial of service.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.0.1 - 4.0.9, 4.1.1 - 4.11.12, 4.2.0 - 4.2.8, 4.3 - 4.3.6, 4.4.0 - 4.4.94, 4.5 - 4.5.7, 4.6 rc1 - 4.6.7, 4.7 - 4.7.10, 4.8 - 4.8.17, 4.9 - 4.9.58

linux_kernel (Debian package): 4.6.4-1 - 4.7.2-1

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External links
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=499350a5a6e7512d9ed369...

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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.