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Ubuntu 18.04 LTS USN-6440-1 Critical: Linux Kernel Denial Of Service

ubuntu
Calendar Grey October 20, 2023
Dist Ubuntu Esm H88
Ensure your Ubuntu installations are updated to address vulnerabilities in the kernel, safeguarding against possible service interruptions and enhancing system security.
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-azure-4.15: Linux kernel for Microsoft Azure Cloud systems

- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems

- linux-kvm: Linux kernel for cloud environments

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

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

- linux-oracle: Linux kernel for Oracle Cloud systems

Details:

Seth Jenkins discovered that the Linux kernel did not properly perform

address randomization for a per-cpu memory management structure. A local

attacker could use this to expose sensitive information (kernel memory) or

in conjunction with another kernel vulnerability. (CVE-2023-0597)

It was discovered that the IPv6 implementation in the Linux kernel

contained a high rate of...

Read the Full Advisory

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Topics Covered

security advisory denial of service critical Ubuntu update instructions Linux kernel kernel issues

Update Instructions

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   linux-image-4.15.0-1146-kvm     4.15.0-1146.151
   linux-image-4.15.0-1156-gcp     4.15.0-1156.173
   linux-image-4.15.0-1162-aws     4.15.0-1162.175
   linux-image-4.15.0-1171-azure   4.15.0-1171.186
   linux-image-4.15.0-219-generic  4.15.0-219.230
   linux-image-4.15.0-219-lowlatency  4.15.0-219.230
   linux-image-aws-lts-18.04       4.15.0.1162.160
   linux-image-azure-lts-18.04     4.15.0.1171.139
   linux-image-gcp-lts-18.04       4.15.0.1156.170
   linux-image-generic             4.15.0.219.203
   linux-image-kvm                 4.15.0.1146.137
   linux-image-lowlatency          4.15.0.219.203
   linux-image-virtual             4.15.0.219.203

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   linux-image-4.15.0-1125-oracle  4.15.0-1125.136~16.04.1
   linux-image-4.15.0-1156-gcp     4.15.0-1156.173~16.04.1
   linux-image-4.15.0-1171-azure   4.15.0-1171.186~16.04.1
   linux-image-4.15.0-219-generic  4.15.0-219.230~16.04.1
   linux-image-4.15.0-219-lowlatency  4.15.0-219.230~16.04.1
   linux-image-azure               4.15.0.1171.155
   linux-image-gcp                 4.15.0.1156.146
   linux-image-generic-hwe-16.04   4.15.0.219.3
   linux-image-gke                 4.15.0.1156.146
   linux-image-lowlatency-hwe-16.04  4.15.0.219.3
   linux-image-oem                 4.15.0.219.3
   linux-image-oracle              4.15.0.1125.106
   linux-image-virtual-hwe-16.04   4.15.0.219.3

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-6440-1

CVE-2023-0597, CVE-2023-1206, CVE-2023-31083, CVE-2023-34319,

CVE-2023-3772, CVE-2023-42752, CVE-2023-42753, CVE-2023-42755,

CVE-2023-4622, CVE-2023-4623, CVE-2023-4881, CVE-2023-4921

Severity
critical
Lowest
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Critical

Ubuntu Security Notice USN-6440-1

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu update instructions Linux kernel kernel issues

Package Information

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