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Ubuntu 5413-1 Critical: Linux Kernel Use-After-Free DoS Issues

ubuntu
Calendar Grey May 11, 2022
Dist Ubuntu Esm H88
The Linux Kernel Security Advisory USN-5414-1 outlines critical vulnerabilities and necessary patches for Ubuntu users, promoting system reliability.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

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

- linux-kvm: Linux kernel for cloud environments

- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

Jeremy Cline discovered a use-after-free in the nouveau graphics driver

of the Linux kernel during device removal. A privileged or physically

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

crash). (CVE-2020-27820)

It was discovered that a race condition existed in the network scheduling

subsystem of the Linux kernel, leading to a use-after-free vulnerability. A

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

or possibly execute arbitrary code. (CVE-2021-39713)

It was discovered that the Parallel NFS (pNFS) implementation in the Linux

kernel did not properly perform bounds checking in some situations. An

attacker could use this to cause...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical system update ubuntu kernel issues use-after-free

Update Instructions

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

Ubuntu 16.04 ESM:
  linux-image-4.4.0-1105-kvm      4.4.0-1105.114
  linux-image-4.4.0-1140-aws      4.4.0-1140.154
  linux-image-4.4.0-224-generic   4.4.0-224.257
  linux-image-4.4.0-224-lowlatency  4.4.0-224.257
  linux-image-aws                 4.4.0.1140.145
  linux-image-generic             4.4.0.224.231
  linux-image-kvm                 4.4.0.1105.103
  linux-image-lowlatency          4.4.0.224.231
  linux-image-virtual             4.4.0.224.231

Ubuntu 14.04 ESM:
  linux-image-4.4.0-224-generic   4.4.0-224.257~14.04.1
  linux-image-4.4.0-224-lowlatency  4.4.0-224.257~14.04.1
  linux-image-generic-lts-xenial  4.4.0.224.195
  linux-image-lowlatency-lts-xenial  4.4.0.224.195
  linux-image-virtual-lts-xenial  4.4.0.224.195

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-5413-1

CVE-2020-27820, CVE-2021-39713, CVE-2021-4157, CVE-2022-26490,

CVE-2022-27223, CVE-2022-28390

Severity
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May 12, 2022

Topics%20covered

Topics Covered

security advisory denial of service critical system update ubuntu kernel issues use-after-free

Package Information

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