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Ubuntu: 4343-1 Moderate: Linux Kernel Crack on s390x System

ubuntu
Calendar Grey April 28, 2020
Dist Ubuntu Esm H88
Computers utilizing s390x architectures may experience failures or execute applications with elevated privileges as a result of a kernel vulnerability revealed by Ubuntu USN-4343-1.
Systems running on s390x architecture could be made to crash or run programs as an administrator under certain conditions.

Summary

Systems running on s390x architecture could be made to crash or run

programs as an administrator under certain conditions.

Software Description:

- linux: Linux kernel

Details:

Al Viro discovered that the Linux kernel for s390x systems did not properly

perform page table upgrades for kernel sections that use secondary address

mode. A local attacker could use this to cause a denial of service (system

crash) or execute arbitrary code.

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu linux kernel s390x architecture

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.4.0-28-generic    5.4.0-28.32
  linux-image-5.4.0-28-generic-lpae  5.4.0-28.32
  linux-image-5.4.0-28-lowlatency  5.4.0-28.32
  linux-image-generic             5.4.0.28.33
  linux-image-generic-lpae        5.4.0.28.33
  linux-image-lowlatency          5.4.0.28.33
  linux-image-oem                 5.4.0.28.33
  linux-image-oem-osp1            5.4.0.28.33
  linux-image-virtual             5.4.0.28.33

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

https://ubuntu.com/security/notices/USN-4343-1

CVE-2020-11884

April 28, 2020

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu linux kernel s390x architecture

Package Information

https://launchpad.net/ubuntu/+source/linux/5.4.0-28.32

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