1. Ubuntu Security Notices
  2. USN-4209-1

USN-4209-1: Linux kernel vulnerabilities

Publication date

2 December 2019

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

Jann Horn discovered that the OverlayFS and ShiftFS Drivers in the Linux
kernel did not properly handle reference counting during memory mapping
operations when used in conjunction with AUFS. A local attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2019-15794)

It was discovered that a buffer overflow existed in the 802.11 Wi-Fi
configuration interface for the Linux kernel when handling beacon settings.
A local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2019-16746)

It was discovered that there was a memory leak in the Advanced Buffer
Management functionality of the Netronome NFP4000/NFP6000 NIC Driver in the
Linux kernel during certain error scenarios. A local attacker could use
this to cause a denial of service (memory...

Jann Horn discovered that the OverlayFS and ShiftFS Drivers in the Linux
kernel did not properly handle reference counting during memory mapping
operations when used in conjunction with AUFS. A local attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2019-15794)

It was discovered that a buffer overflow existed in the 802.11 Wi-Fi
configuration interface for the Linux kernel when handling beacon settings.
A local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2019-16746)

It was discovered that there was a memory leak in the Advanced Buffer
Management functionality of the Netronome NFP4000/NFP6000 NIC Driver in the
Linux kernel during certain error scenarios. A local attacker could use
this to cause a denial of service (memory exhaustion). (CVE-2019-19076)

Update instructions

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

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
19.04 disco linux-image-5.0.0-1008-oracle –  5.0.0-1008.13
linux-image-5.0.0-1022-aws –  5.0.0-1022.25
linux-image-5.0.0-1023-kvm –  5.0.0-1023.25
linux-image-5.0.0-1023-raspi2 –  5.0.0-1023.24
linux-image-5.0.0-1026-gcp –  5.0.0-1026.27
linux-image-5.0.0-37-generic –  5.0.0-37.40
linux-image-5.0.0-37-generic-lpae –  5.0.0-37.40
linux-image-5.0.0-37-lowlatency –  5.0.0-37.40
linux-image-aws –  5.0.0.1022.24
linux-image-gcp –  5.0.0.1026.51
linux-image-generic –  5.0.0.37.39
linux-image-generic-lpae –  5.0.0.37.39
linux-image-gke –  5.0.0.1026.51
linux-image-kvm –  5.0.0.1023.24
linux-image-lowlatency –  5.0.0.37.39
linux-image-oracle –  5.0.0.1008.34
linux-image-raspi2 –  5.0.0.1023.21
linux-image-virtual –  5.0.0.37.39
18.04 bionic linux-image-5.0.0-1008-oracle –  5.0.0-1008.13~18.04.1
linux-image-5.0.0-1022-aws –  5.0.0-1022.25~18.04.1
linux-image-5.0.0-1026-gcp –  5.0.0-1026.27~18.04.1
linux-image-5.0.0-1026-gke –  5.0.0-1026.27~18.04.2
linux-image-5.0.0-1030-oem-osp1 –  5.0.0-1030.34
linux-image-5.0.0-37-generic –  5.0.0-37.40~18.04.1
linux-image-5.0.0-37-generic-lpae –  5.0.0-37.40~18.04.1
linux-image-5.0.0-37-lowlatency –  5.0.0-37.40~18.04.1
linux-image-aws-edge –  5.0.0.1022.36
linux-image-gcp –  5.0.0.1026.30
linux-image-generic-hwe-18.04 –  5.0.0.37.95
linux-image-generic-lpae-hwe-18.04 –  5.0.0.37.95
linux-image-gke-5.0 –  5.0.0.1026.15
linux-image-lowlatency-hwe-18.04 –  5.0.0.37.95
linux-image-oem-osp1 –  5.0.0.1030.34
linux-image-oracle-edge –  5.0.0.1008.7
linux-image-snapdragon-hwe-18.04 –  5.0.0.37.95
linux-image-virtual-hwe-18.04 –  5.0.0.37.95

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References

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