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Ubuntu 22.04 LTS Security Advisory USN-5471-1: Kernel Threats and Risks

ubuntu
Calendar Grey June 8, 2022
Dist Ubuntu Esm H88
A series of security patches have been implemented in the Ubuntu 22.04 LTS Linux kernel, resolving various threats related to denial of service and possible unauthorized access concerns.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-oem-5.17: Linux kernel for OEM systems

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)

It was discovered that the IP implementation in the Linux kernel did not

provide sufficient randomization when calculating port offsets. An attacker

could possibly use this to expose sensitive information. (CVE-2022-1012)

Duoming Zhou discovered race conditions in the AX.25 amateur radio protocol

implementati...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service access control ubuntu linux kernel kernel threats oem systems

Update Instructions

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

Ubuntu 22.04 LTS:
  linux-image-5.17.0-1011-oem     5.17.0-1011.12
  linux-image-oem-22.04           5.17.0.1011.10
  linux-image-oem-22.04a          5.17.0.1011.10

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-5471-1

CVE-2022-1012, CVE-2022-1205, CVE-2022-1734, CVE-2022-1836,

CVE-2022-1966, CVE-2022-1972, CVE-2022-21499, CVE-2022-29968

Severity
critical
Lowest
Low
Medium
High
Critical

June 08, 2022

Topics%20covered

Topics Covered

security advisory denial of service access control ubuntu linux kernel kernel threats oem systems

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-5.17/5.17.0-1011.12

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