Improper privilege management in Linux kernel - CVE-2017-12154

Vulnerability identifier: #VU8696

CSH Severity: Low

CVSS v4: 6.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2017-12154

CWE-ID: CWE-264

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

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

The prepare_vmcs02 function in arch/x86/kvm/vmx.c in the Linux kernel through 4.13.3 does not ensure that the "CR8-load exiting" and "CR8-store exiting" L0 vmcs02 controls exist in cases where L1 omits the "use TPR shadow" vmcs12 control, which allows KVM L2 guest OS users to obtain read and write access to the hardware CR8 register.

Linux kernel
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
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 for Real Time for NFV
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 for Power, big endian - Extended Update Support
Red Hat Enterprise Linux Server - Extended Update Support
SUSE Linux
Ubuntu
Fedora

kernel (Red Hat package)
kernel-rt (Red Hat package)
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kernel
Red Hat Virtualization Host

Install the latest version of Linux kernel 4.4.90, 4.13.5 or 4.9.53.

kernel (Red Hat package) - addressed in versions 3.10.0-693.55.1.el7, 3.10.0-862.el7
kernel-rt (Red Hat package) - update to 3.10.0-862.rt56.804.el7
kernel - addressed in versions 4.12.13-200.fc25, 4.12.13-300.fc26

• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.90
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.5
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.53

• OpenSUSE Linux update for the Linux Kernel
• OpenSUSE Linux update for the Linux Kernel
• SUSE Linux update for the Linux Kernel
• Ubuntu update for Linux kernel
• Red Hat update for kernel
• Red Hat update for kernel
• Red Hat update for kernel-rt
• Fedora 26 update for kernel
• Fedora 25 update for kernel