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Ubuntu 16.04 ESM: USN-6045-1 Critical: Kernel Denial of Service

ubuntu
Calendar Grey April 26, 2023
Dist Ubuntu Esm H88
Important updates for Ubuntu's Linux kernel were released to patch urgent security vulnerabilities on April 26, 2023. Make sure to update your systems promptly.
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 Traffic-Control Index (TCINDEX) implementation

in the Linux kernel did not properly perform filter deactivation in some

situations. A local attacker could possibly use this to gain elevated

privileges. Please note that with the fix for this CVE, kernel support for

the TCINDEX classifier has been removed. (CVE-2023-1829)

Gwnaun Jung discovered that the SFB packet scheduling 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-2022-3586)

Zheng Wang and Zhuorao Yang discovered that the RealTek RTL8712...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical update instructions ubuntu linux kernel

Update Instructions

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

Ubuntu 16.04 ESM:
   linux-image-4.4.0-1119-kvm      4.4.0-1119.129
   linux-image-4.4.0-1156-aws      4.4.0-1156.171
   linux-image-4.4.0-240-generic   4.4.0-240.274
   linux-image-4.4.0-240-lowlatency  4.4.0-240.274
   linux-image-aws                 4.4.0.1156.160
   linux-image-generic             4.4.0.240.246
   linux-image-generic-lts-xenial  4.4.0.240.246
   linux-image-kvm                 4.4.0.1119.116
   linux-image-lowlatency          4.4.0.240.246
   linux-image-lowlatency-lts-xenial  4.4.0.240.246
   linux-image-virtual             4.4.0.240.246
   linux-image-virtual-lts-xenial  4.4.0.240.246

Ubuntu 14.04 ESM:
   linux-image-4.4.0-1118-aws      4.4.0-1118.124
   linux-image-4.4.0-240-generic   4.4.0-240.274~14.04.1
   linux-image-4.4.0-240-lowlatency  4.4.0-240.274~14.04.1
   linux-image-aws                 4.4.0.1118.115
   linux-image-generic-lts-xenial  4.4.0.240.208
   linux-image-lowlatency-lts-xenial  4.4.0.240.208
   linux-image-virtual-lts-xenial  4.4.0.240.208

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-6045-1

CVE-2022-3586, CVE-2022-4095, CVE-2023-1390, CVE-2023-1670,

CVE-2023-1829

Severity
critical
Lowest
Low
Medium
High
Critical

April 26, 2023

Topics%20covered

Topics Covered

security advisory denial of service critical update instructions ubuntu linux kernel

Package Information

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