NULL pointer dereference in Linux kernel - CVE-2018-16871

Vulnerability identifier: #VU19573

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2018-16871

CWE-ID: CWE-476

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in the Network File System (NFS) implementation. A remote authenticated attacker can mount an exported NFS filesystem, cause a NULL pointer dereference condition due to an invalid NFS sequence and perform a denial of service (DoS) attack.

Linux kernel
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for IBM System z (Structure A)
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux Server - Extended Update Support
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Opensuse

MRG Realtime
kernel (Red Hat package)
kernel-rt (Red Hat package)
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
kernel-alt (Red Hat package)

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

kernel (Red Hat package) - addressed in versions 3.10.0-693.58.1.el7, 4.18.0-193.el8
kernel-rt (Red Hat package) - addressed in versions 3.10.0-693.58.1.rt56.652.el6rt, 4.18.0-193.rt13.51.el8
kernel-alt (Red Hat package) - update to 4.14.0-115.18.1.el7a

• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=01310bb7c9c98752cc763b...
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=01310bb7c9c98752cc763b3...

• Red Hat update for kernel-rt
• Red Hat update for kernel
• OpenSUSE Linux update for the Linux Kernel
• OpenSUSE Linux update for the Linux Kernel
• Red Hat Enterprise Linux 7 update for kernel-alt
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 8 update for kernel