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Ubuntu: USN-6494-1 Moderate: Kernel Denial of Service Issues

ubuntu
Calendar Grey November 21, 2023
Dist Ubuntu Esm H88
Critical vulnerabilities addressed in the Linux kernel for Ubuntu users. Essential guidance provided for implementing updates.
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-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems

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

- linux-oracle: Linux kernel for Oracle Cloud systems

Details:

Yu Hao discovered that the UBI driver in the Linux kernel did not properly

check for MTD with zero erasesize during device attachment. A local

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

crash). (CVE-2023-31085)

Lucas Leong discovered that the netfilter subsystem in the Linux kernel did

not properly validate some attributes passed from userspace. A local

attacker could use this to cause a denial of service (system crash) or

possibly expose sensitive information (kernel memory). (CVE-2023-39189)

Sunjoo Park discovered that the netfilte...

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Topics Covered

security advisory denial of service kernel ubuntu system crash

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-4.15.0-1147-kvm     4.15.0-1147.152
   linux-image-4.15.0-1163-aws     4.15.0-1163.176
   linux-image-4.15.0-220-generic  4.15.0-220.231
   linux-image-4.15.0-220-lowlatency  4.15.0-220.231
   linux-image-aws-lts-18.04       4.15.0.1163.161
   linux-image-generic             4.15.0.220.204
   linux-image-kvm                 4.15.0.1147.138
   linux-image-lowlatency          4.15.0.220.204
   linux-image-virtual             4.15.0.220.204

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   linux-image-4.15.0-1126-oracle  4.15.0-1126.137~16.04.1
   linux-image-4.15.0-1163-aws     4.15.0-1163.176~16.04.1
   linux-image-4.15.0-220-generic  4.15.0-220.231~16.04.1
   linux-image-4.15.0-220-lowlatency  4.15.0-220.231~16.04.1
   linux-image-aws-hwe             4.15.0.1163.146
   linux-image-generic-hwe-16.04   4.15.0.220.4
   linux-image-lowlatency-hwe-16.04  4.15.0.220.4
   linux-image-oem                 4.15.0.220.4
   linux-image-oracle              4.15.0.1126.107
   linux-image-virtual-hwe-16.04   4.15.0.220.4

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-6494-1

CVE-2023-31085, CVE-2023-39189, CVE-2023-39192, CVE-2023-39193,

CVE-2023-39194, CVE-2023-42754, CVE-2023-45862, CVE-2023-45871,

CVE-2023-5717

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6494-1

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Topics Covered

security advisory denial of service kernel ubuntu system crash

Package Information

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