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Ubuntu 14.04 ESM USN-5484-1 Critical: Kernel Issues and Fixes

ubuntu
Calendar Grey June 16, 2022
Dist Ubuntu Esm H88
Numerous updates addressing various Linux kernel vulnerabilities have been issued, affecting system security and stability; timely installation recommended.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

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)

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 some Intel processors did not completely perform

cleanup actions on multi-core shared buffers. A local attacker could

possibly use this to expose sensitive information. (CVE-2022-21123)

It was discovered that some Intel processors did not completely perform

cleanup actions on microarchitectural fill buffers. A local attacker could

possibly use thi...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel update system integrity ubuntu access restriction secure boot

Update Instructions

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

Ubuntu 14.04 ESM:
  linux-image-3.13.0-190-generic  3.13.0-190.241
  linux-image-3.13.0-190-lowlatency  3.13.0-190.241
  linux-image-generic             3.13.0.190.199
  linux-image-lowlatency          3.13.0.190.199
  linux-image-server              3.13.0.190.199
  linux-image-virtual             3.13.0.190.199

Please note that fully mitigating processor vulnerabilities requires
corresponding processor microcode/firmware updates.

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-5484-1

CVE-2021-39713, CVE-2022-21123, CVE-2022-21125, CVE-2022-21166,

CVE-2022-21499

Severity
critical
Lowest
Low
Medium
High
Critical

June 16, 2022

Topics%20covered

Topics Covered

security advisory denial of service kernel update system integrity ubuntu access restriction secure boot

Package Information

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