Ubuntu 20.04: USN-5137-2 Moderate: Kernel Denial of Service Threat

ubuntu

November 11, 2021

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-bluefield: Linux kernel for NVIDIA BlueField platforms

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-gke-5.4: Linux kernel for Google Container Engine (GKE) systems

- linux-oracle-5.4: Linux kernel for Oracle Cloud systems

Details:

It was discovered that the f2fs file system in the Linux kernel did not

properly validate metadata in some situations. An attacker could use this

to construct a malicious f2fs image that, when mounted and operated on,

could cause a denial of service (system crash) or possibly execute

arbitrary code. (CVE-2019-19449)

It was discovered that the Infiniband RDMA userspace connection manager

implementation in the Linux kernel contained a race condition leading to a

use-after-free vulnerability. A local attacker could use this to cause a

denial of service (system crash) or possible execute arbitrary code.

(CVE-2020-36385)

Wolfgang Frisch discovered that t...

Read the Full Advisory

Topics Covered

security advisory denial of service kernel system update ubuntu linux patch linux vulnerabilities

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.4.0-1021-bluefield  5.4.0-1021.24
  linux-image-5.4.0-1057-oracle   5.4.0-1057.61
  linux-image-bluefield           5.4.0.1021.22
  linux-image-oracle-lts-20.04    5.4.0.1057.57

Ubuntu 18.04 LTS:
  linux-image-5.4.0-1055-gke      5.4.0-1055.58~18.04.1
  linux-image-5.4.0-1057-oracle   5.4.0-1057.61~18.04.1
  linux-image-gke-5.4             5.4.0.1055.58~18.04.20
  linux-image-oracle              5.4.0.1057.61~18.04.37

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.