NULL pointer derefenrece in Linux kernel - CVE-2017-12193

Vulnerability identifier: #VU9082

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-2017-12193

CWE-ID: CWE-476

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists in the assoc_array implementation in which a new leaf is added that needs to go into a node that happens to be full. A local user can trigger NULL pointer dereference error and crash the kernel.

Linux kernel
Amazon Linux AMI
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
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 - TUS
Red Hat Enterprise Linux Server (for IBM Power LE) - 4 Year Extended Update Support
Red Hat Enterprise Linux Server - 4 Year Extended Update Support
Red Hat Enterprise Linux Server - Extended Update Support
Red Hat Enterprise Linux Server - AUS
SUSE Linux
Ubuntu
Fedora
Red Hat Virtualization Host
kernel (Red Hat package)
kernel

Update to 4.13.11, 4.9.60, 4.4.96 or 4.1.46.

kernel (Red Hat package) - update to 3.10.0-693.17.1.el7
kernel - addressed in versions 4.13.11-100.fc25, 4.13.11-200.fc26, 4.13.11-300.fc27

• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.11
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.96
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.1.46
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.60

• Ubuntu update for Linux kernel (GCP)
• Ubuntu update for Linux kernel
• Ubuntu update for Linux kernel
• Ubuntu update for Linux kernel (Xenial HWE)
• Ubuntu update for Linux kernel
• Ubuntu update for Linux kernel (Xenial HWE)
• SUSE Linux update for the Linux Kernel
• SUSE Linux update for the Linux Kernel
• Amazon Linux AMI update for kernel
• OpenSUSE Linux update for the Linux Kernel
• OpenSUSE Linux update for the Linux Kernel
• SUSE Linux update for the Linux Kernel
• SUSE Linux update for the Linux Kernel
• SUSE Linux update for the Linux Kernel
• Fedora 25 update for kernel
• Fedora 26 update for kernel
• Fedora 27 update for kernel
• Red Hat Enterprise Linux 7 update for kernel