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

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Main Vulnerability Database Vulnerabilities #VU8922

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

Published: October 25, 2017


Vulnerability identifier: #VU8922
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2017-14106
CWE-ID: CWE-369
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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.

Affected software

Linux kernel
Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems)
Red Hat Enterprise Linux Server - Extended Life Cycle Support
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux Server - 4 Year Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux Server (for IBM Power LE) - 4 Year Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux Server - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux EUS Compute Node
SUSE Linux
Ubuntu
linux_kernel (Debian package)
kernel (Red Hat package)
kernel-rt (Red Hat package)

MRG Realtime
Red Hat Virtualization Host

How to mitigate CVE-2017-14106

Install update from vendor's website.

kernel (Red Hat package) - addressed in versions 2.6.18-433.el5, 2.6.32-696.16.1.el6, 3.10.0-693.5.2.el7
kernel-rt (Red Hat package) - addressed in versions 3.10.0-693.5.2.rt56.592.el6rt, 3.10.0-693.5.2.rt56.626.el7

External References

Related Security Bulletins