Data handling in Linux kernel - CVE-2016-4470

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Main Vulnerability Database Vulnerabilities #VU3800

Data handling in Linux kernel - CVE-2016-4470

Published: July 1, 2016 / Updated: April 17, 2018


Vulnerability identifier: #VU3800
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-2016-4470
CWE-ID: CWE-19
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 in the key_reject_and_link function in security/keys/key.c due to it does not ensure that a certain data structure is initialized. A local attacker can cause the service to crash via vectors involving a crafted keyctl request2 command.

Affected software

Linux kernel
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, big endian
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 Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux Server - Extended Update Support
SUSE Linux
Fedora

kernel (Red Hat package)
kernel

How to mitigate CVE-2016-4470

Update to version 4.6.3.

kernel (Red Hat package) - addressed in versions 2.6.32-358.75.1.el6, 2.6.32-431.74.1.el6, 2.6.32-504.54.1.el6, 2.6.32-573.35.1.el6, 2.6.32-642.6.1.el6, 3.10.0-229.40.1.el7
kernel - addressed in versions 4.4.14-200.fc22, 4.5.7-202.fc23, 4.6.3-300.fc24

External References

Related Security Bulletins