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Ubuntu 16.04 ESM USN-5465-1 Moderate Linux Kernel Issues

ubuntu
Calendar Grey June 8, 2022
Dist Ubuntu Esm H88
Multiple vulnerabilities in the Linux kernel addressed in recent Ubuntu updates, necessitating prompt installations for security and optimal functionality.
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:

It was discovered that the Linux kernel did not properly restrict access to

the kernel debugger when booted in secure boot environments. A privileged

attacker could use this to bypass UEFI Secure Boot restrictions.

(CVE-2022-21499)

Aaron Adams discovered that the netfilter subsystem in the Linux kernel did

not properly handle the removal of stateful expressions in some situations,

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

to cause a denial of service (system crash) or execute arbitrary code.

(CVE-2022-1966)

Jann Horn discovered that the Linux kernel did not properly enforce seccomp

restrictions in some situations. A local attacker could use this to byp...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory moderate threat kernel issue ubuntu Linux update

Update Instructions

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

Ubuntu 16.04 ESM:
  linux-image-4.4.0-1108-kvm      4.4.0-1108.118
  linux-image-4.4.0-1143-aws      4.4.0-1143.158
  linux-image-4.4.0-227-generic   4.4.0-227.261
  linux-image-4.4.0-227-lowlatency  4.4.0-227.261
  linux-image-aws                 4.4.0.1143.147
  linux-image-generic             4.4.0.227.233
  linux-image-kvm                 4.4.0.1108.105
  linux-image-lowlatency          4.4.0.227.233
  linux-image-virtual             4.4.0.227.233

Ubuntu 14.04 ESM:
  linux-image-4.4.0-1107-aws      4.4.0-1107.113
  linux-image-4.4.0-227-generic   4.4.0-227.261~14.04.1
  linux-image-4.4.0-227-lowlatency  4.4.0-227.261~14.04.1
  linux-image-aws                 4.4.0.1107.104
  linux-image-generic-lts-xenial  4.4.0.227.197
  linux-image-lowlatency-lts-xenial  4.4.0.227.197
  linux-image-virtual-lts-xenial  4.4.0.227.197

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-5465-1

CVE-2022-1966, CVE-2022-21499, CVE-2022-30594

June 08, 2022

Topics%20covered

Topics Covered

security advisory moderate threat kernel issue ubuntu Linux update

Package Information

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