Ubuntu 18.04 LTS: 5260-2 High: Kernel Memory Leak Vulnerability

ubuntu

March 30, 2022

The system could be made to crash or run programs as an administrator.

Summary

The system could be made to crash or run programs as an administrator.

Software Description:

- linux: Linux kernel

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

- linux-azure-4.15: Linux kernel for Microsoft Azure Cloud systems

- linux-dell300x: Linux kernel for Dell 300x platforms

- linux-kvm: Linux kernel for cloud environments

- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

It was discovered that the IPsec implementation in the Linux

kernel did not properly allocate enough memory when performing ESP

transformations, leading to a heap-based buffer overflow. A local

attacker could use this to cause a denial of service (system crash)

or possibly execute arbitrary code.

Topics Covered

security advisory denial of service heap overflow ubuntu linux kernel

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1040-dell300x  4.15.0-1040.45
  linux-image-4.15.0-1112-kvm     4.15.0-1112.115
  linux-image-4.15.0-1125-snapdragon  4.15.0-1125.134
  linux-image-4.15.0-1126-aws     4.15.0-1126.135
  linux-image-4.15.0-1136-azure   4.15.0-1136.149
  linux-image-4.15.0-175-generic  4.15.0-175.184
  linux-image-4.15.0-175-generic-lpae  4.15.0-175.184
  linux-image-4.15.0-175-lowlatency  4.15.0-175.184
  linux-image-aws-lts-18.04       4.15.0.1126.129
  linux-image-azure-lts-18.04     4.15.0.1136.109
  linux-image-dell300x            4.15.0.1040.42
  linux-image-generic             4.15.0.175.164
  linux-image-generic-lpae        4.15.0.175.164
  linux-image-kvm                 4.15.0.1112.108
  linux-image-lowlatency          4.15.0.175.164
  linux-image-snapdragon          4.15.0.1125.128
  linux-image-virtual             4.15.0.175.164

Ubuntu 16.04 ESM:
  linux-image-4.15.0-175-generic  4.15.0-175.184~16.04.1
  linux-image-4.15.0-175-lowlatency  4.15.0-175.184~16.04.1
  linux-image-generic-hwe-16.04   4.15.0.175.167
  linux-image-lowlatency-hwe-16.04  4.15.0.175.167
  linux-image-oem                 4.15.0.175.167
  linux-image-virtual-hwe-16.04   4.15.0.175.167

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.