NULL pointer dereference in Linux kernel - CVE-2017-18216
Published: March 28, 2018
Vulnerability identifier: #VU11299
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-2017-18216
CWE-ID: CWE-476
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 the affected software does not use the subsystem.su_mutex component while accessing an item->ci_parent. A local attacker can trigger NULL pointer dereference in in the fs/ocfs2/cluster/nodemanager.c source code file cause the service to crash.
The weakness exists due to the affected software does not use the subsystem.su_mutex component while accessing an item->ci_parent. A local attacker can trigger NULL pointer dereference in in the fs/ocfs2/cluster/nodemanager.c source code file cause the service to crash.
Affected software
Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-lts-xenial (Ubuntu package)
linux-kvm (Ubuntu package)
linux-aws (Ubuntu package)
linux-snapdragon (Ubuntu package)
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-lts-xenial (Ubuntu package)
linux-kvm (Ubuntu package)
linux-aws (Ubuntu package)
linux-snapdragon (Ubuntu package)
How to mitigate CVE-2017-18216
Update to version 4.15.
linux (Ubuntu package) - update to 4.4.0-137.163
linux-lts-xenial (Ubuntu package) - update to 4.4.0-137.163~14.04.1
linux-kvm (Ubuntu package) - update to 4.4.0-1035.41
linux-aws (Ubuntu package) - addressed in versions 4.4.0-1031.34, 4.4.0-1069.79
linux-snapdragon (Ubuntu package) - update to 4.4.0-1102.107
linux-lts-xenial (Ubuntu package) - update to 4.4.0-137.163~14.04.1
linux-kvm (Ubuntu package) - update to 4.4.0-1035.41
linux-aws (Ubuntu package) - addressed in versions 4.4.0-1031.34, 4.4.0-1069.79
linux-snapdragon (Ubuntu package) - update to 4.4.0-1102.107