USN-4254-1: Linux kernel vulnerabilities

  • Thread starter Ubuntu security notices
  • Start date
U

Ubuntu security notices

Guest
linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities


A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 16.04 LTS
Summary


Several security issues were fixed in the Linux kernel.

Software Description

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-kvm - Linux kernel for cloud environments
  • linux-raspi2 - Linux kernel for Raspberry Pi 2
  • linux-snapdragon - Linux kernel for Snapdragon processors
Details


It was discovered that the Linux kernel did not properly clear data structures on context switches for certain Intel graphics processors. A local attacker could use this to expose sensitive information. (CVE-2019-14615)

It was discovered that a race condition existed in the Virtual Video Test Driver in the Linux kernel. An attacker with write access to /dev/video0 on a system with the vivid module loaded could possibly use this to gain administrative privileges. (CVE-2019-18683)

It was discovered that the btrfs file system in the Linux kernel did not properly validate metadata, leading to a NULL pointer dereference. An attacker could use this to specially craft a file system image that, when mounted, could cause a denial of service (system crash). (CVE-2019-18885)

It was discovered that multiple memory leaks existed in the Marvell WiFi-Ex Driver for the Linux kernel. A local attacker could possibly use this to cause a denial of service (kernel memory exhaustion). (CVE-2019-19057)

It was discovered that the crypto subsystem in the Linux kernel did not properly deallocate memory in certain error conditions. A local attacker could use this to cause a denial of service (kernel memory exhaustion). (CVE-2019-19062)

It was discovered that the Realtek rtlwifi USB device driver in the Linux kernel did not properly deallocate memory in certain error conditions. A local attacker could possibly use this to cause a denial of service (kernel memory exhaustion). (CVE-2019-19063)

Dan Carpenter discovered that the AppleTalk networking subsystem of the Linux kernel did not properly handle certain error conditions, leading to a NULL pointer dereference. A local attacker could use this to cause a denial of service (system crash). (CVE-2019-19227)

It was discovered that the KVM hypervisor implementation in the Linux kernel did not properly handle ioctl requests to get emulated CPUID features. An attacker with access to /dev/kvm could use this to cause a denial of service (system crash). (CVE-2019-19332)

It was discovered that the B2C2 FlexCop USB device driver in the Linux kernel did not properly validate device metadata. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2019-15291)

Update instructions


The problem can be corrected by updating your system to the following package versions:

Ubuntu 16.04 LTS
linux-image-4.4.0-1065-kvm - 4.4.0-1065.72
linux-image-4.4.0-1101-aws - 4.4.0-1101.112
linux-image-4.4.0-1128-raspi2 - 4.4.0-1128.137
linux-image-4.4.0-1132-snapdragon - 4.4.0-1132.140
linux-image-4.4.0-173-generic - 4.4.0-173.203
linux-image-4.4.0-173-generic-lpae - 4.4.0-173.203
linux-image-4.4.0-173-lowlatency - 4.4.0-173.203
linux-image-4.4.0-173-powerpc-e500mc - 4.4.0-173.203
linux-image-4.4.0-173-powerpc-smp - 4.4.0-173.203
linux-image-4.4.0-173-powerpc64-emb - 4.4.0-173.203
linux-image-4.4.0-173-powerpc64-smp - 4.4.0-173.203
linux-image-aws - 4.4.0.1101.105
linux-image-generic - 4.4.0.173.181
linux-image-generic-lpae - 4.4.0.173.181
linux-image-kvm - 4.4.0.1065.65
linux-image-lowlatency - 4.4.0.173.181
linux-image-powerpc-e500mc - 4.4.0.173.181
linux-image-powerpc-smp - 4.4.0.173.181
linux-image-powerpc64-emb - 4.4.0.173.181
linux-image-powerpc64-smp - 4.4.0.173.181
linux-image-raspi2 - 4.4.0.1128.128
linux-image-snapdragon - 4.4.0.1132.124
linux-image-virtual - 4.4.0.173.181

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to reboot your computer to make all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well.

References


Continue reading...
 
Top