USN-3732-1: Linux kernel vulnerability

Releases

• Ubuntu 18.04 ESM

Packages

• linux - Linux kernel
• linux-aws - Linux kernel for Amazon Web Services (AWS) systems
• linux-azure - Linux kernel for Microsoft Azure Cloud systems
• linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
• linux-kvm - Linux kernel for cloud environments
• linux-oem - Linux kernel for OEM processors
• linux-raspi2 - Linux kernel for Raspberry Pi 2

Details

Juha-Matti Tilli discovered that the TCP implementation in the Linux kernel
performed algorithmically expensive operations in some situations when
handling incoming packets. A remote attacker could use this to cause a
denial of service.

Update instructions

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

Ubuntu 18.04

• linux-image-4.15.0-1015-gcp - 4.15.0-1015.15
• linux-image-4.15.0-1017-aws - 4.15.0-1017.17
• linux-image-4.15.0-1017-kvm - 4.15.0-1017.17
• linux-image-4.15.0-1018-raspi2 - 4.15.0-1018.19
• linux-image-4.15.0-30-generic - 4.15.0-30.32
• linux-image-4.15.0-30-generic-lpae - 4.15.0-30.32
• linux-image-4.15.0-30-lowlatency - 4.15.0-30.32
• linux-image-4.15.0-30-snapdragon - 4.15.0-30.32

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

• CVE-2018-5390

Related notices

• USN-3742-1
• USN-3742-2
• USN-3763-1
• USN-3741-2
• USN-3741-1
• USN-3732-2