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Ubuntu 20.04 LTS USN-6040-1 Moderate: Kernel Issues Fixes

ubuntu
Calendar Grey April 25, 2023
Dist Ubuntu Esm H88
Examine the vital security alert USN-6040-1 which outlines kernel flaws and necessary patches for Ubuntu. Ensure your systems remain secure!
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-hwe-5.15: Linux hardware enablement (HWE) kernel

Details:

It was discovered that the Traffic-Control Index (TCINDEX) implementation

in the Linux kernel contained 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-2023-1281)

It was discovered that the OverlayFS implementation in the Linux kernel did

not properly handle copy up operation in some conditions. A local attacker

could possibly use this to gain elevated privileges. (CVE-2023-0386)

Haowei Yan discovered that a race condition existed in the Layer 2

Tunneling Protocol (L2TP) implementation in the Linux kernel. A local

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

crash). (CVE-2022-4129)

It was discovered that the network queuing discipline implementation in the

Linux kernel contained a null po...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel update code execution memory leak ubuntu elevated privileges

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.15.0-70-generic   5.15.0-70.77~20.04.1
   linux-image-5.15.0-70-generic-64k  5.15.0-70.77~20.04.1
   linux-image-5.15.0-70-generic-lpae  5.15.0-70.77~20.04.1
   linux-image-generic-64k-hwe-20.04  5.15.0.70.77~20.04.31
   linux-image-generic-hwe-20.04   5.15.0.70.77~20.04.31
   linux-image-generic-lpae-hwe-20.04  5.15.0.70.77~20.04.31
   linux-image-oem-20.04           5.15.0.70.77~20.04.31
   linux-image-oem-20.04b          5.15.0.70.77~20.04.31
   linux-image-oem-20.04c          5.15.0.70.77~20.04.31
   linux-image-oem-20.04d          5.15.0.70.77~20.04.31
   linux-image-virtual-hwe-20.04   5.15.0.70.77~20.04.31

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-6040-1

CVE-2022-4129, CVE-2022-47929, CVE-2022-4842, CVE-2023-0386,

CVE-2023-0394, CVE-2023-1073, CVE-2023-1074, CVE-2023-1281,

CVE-2023-1652, CVE-2023-26545

Severity
important
Lowest
Low
Medium
High
Critical

April 25, 2023

Topics%20covered

Topics Covered

security advisory denial of service kernel update code execution memory leak ubuntu elevated privileges

Package Information

https://launchpad.net/ubuntu/+source/linux-hwe-5.15/5.15.0-70.77~20.04.1

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