Denial of service in Linux kernel

1) Divide by zero

EUVDB-ID: #VU8922

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 - Divide By Zero

Exploit availability: No

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 - 4.11.12

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

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:4.0.9:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.11.12:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.2.8:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.3.6:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.94:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.5.7:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.6.7:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.7.10:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.8.17:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.9.58:*:*:*:*:*:*:*
• cpe:2.3:a:debian:linux_kernel_debian_package:4.6.4-1:*:*:*:*:debian_linux:*:*

External links

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

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.