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Ubuntu 18.04 LTS USN-6396-1 Critical: Kernel Denial Of Service Risks

ubuntu
Calendar Grey September 26, 2023
Dist Ubuntu Esm H88
An advisory detailing security updates for the Ubuntu Linux kernel has been released, highlighting vulnerabilities and urging users to take necessary actions swiftly
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-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems

- 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:

It was discovered that some AMD x86-64 processors with SMT enabled could

speculatively execute instructions using a return address from a sibling

thread. A local attacker could possibly use this to expose sensitive

information. (CVE-2022-27672)

Daniel Moghimi discovered that some Intel(R) Processors did not properly

clear microarchitectural state afte...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical issue ubuntu kernel updates local attacks

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-4.15.0-1155-gcp     4.15.0-1155.172
   linux-image-4.15.0-1161-aws     4.15.0-1161.174
   linux-image-4.15.0-1170-azure   4.15.0-1170.185
   linux-image-4.15.0-218-generic  4.15.0-218.229
   linux-image-4.15.0-218-lowlatency  4.15.0-218.229
   linux-image-aws-lts-18.04       4.15.0.1161.159
   linux-image-azure-lts-18.04     4.15.0.1170.138
   linux-image-gcp-lts-18.04       4.15.0.1155.169
   linux-image-generic             4.15.0.218.202
   linux-image-lowlatency          4.15.0.218.202
   linux-image-virtual             4.15.0.218.202

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   linux-image-4.15.0-1124-oracle  4.15.0-1124.135~16.04.1
   linux-image-4.15.0-1155-gcp     4.15.0-1155.172~16.04.1
   linux-image-4.15.0-1161-aws     4.15.0-1161.174~16.04.1
   linux-image-4.15.0-1170-azure   4.15.0-1170.185~16.04.1
   linux-image-4.15.0-218-generic  4.15.0-218.229~16.04.1
   linux-image-4.15.0-218-lowlatency  4.15.0-218.229~16.04.1
   linux-image-aws-hwe             4.15.0.1161.144
   linux-image-azure               4.15.0.1170.154
   linux-image-gcp                 4.15.0.1155.145
   linux-image-generic-hwe-16.04   4.15.0.218.2
   linux-image-gke                 4.15.0.1155.145
   linux-image-lowlatency-hwe-16.04  4.15.0.218.2
   linux-image-oem                 4.15.0.218.2
   linux-image-oracle              4.15.0.1124.105
   linux-image-virtual-hwe-16.04   4.15.0.218.2

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

CVE-2022-27672, CVE-2022-40982, CVE-2023-3212, CVE-2023-3863,

CVE-2023-40283, CVE-2023-4128

Severity
critical
Lowest
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Critical

Ubuntu Security Notice USN-6396-1

Topics%20covered

Topics Covered

security advisory denial of service critical issue ubuntu kernel updates local attacks

Package Information

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