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Ubuntu 16.04 LTS USN-6532-1: critical issues in kernel resolved

ubuntu
Calendar Grey December 5, 2023
Dist Ubuntu Esm H88
Several flaws addressed in the Ubuntu Linux kernel; issues concerning operational reliability and information exposure resolved.
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:

Tavis Ormandy discovered that some AMD processors did not properly handle

speculative execution of certain vector register instructions. A local

attacker could use this to expose sensitive information. (CVE-2023-20593)

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)...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel information exposure ubuntu crash

Update Instructions

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

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   linux-image-4.4.0-1126-kvm      4.4.0-1126.136
   linux-image-4.4.0-1163-aws      4.4.0-1163.178
   linux-image-4.4.0-248-generic   4.4.0-248.282
   linux-image-4.4.0-248-lowlatency  4.4.0-248.282
   linux-image-aws                 4.4.0.1163.167
   linux-image-generic             4.4.0.248.254
   linux-image-generic-lts-xenial  4.4.0.248.254
   linux-image-kvm                 4.4.0.1126.123
   linux-image-lowlatency          4.4.0.248.254
   linux-image-lowlatency-lts-xenial  4.4.0.248.254
   linux-image-virtual             4.4.0.248.254
   linux-image-virtual-lts-xenial  4.4.0.248.254

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   linux-image-4.4.0-1125-aws      4.4.0-1125.131
   linux-image-4.4.0-248-generic   4.4.0-248.282~14.04.1
   linux-image-4.4.0-248-lowlatency  4.4.0-248.282~14.04.1
   linux-image-aws                 4.4.0.1125.122
   linux-image-generic-lts-xenial  4.4.0.248.215
   linux-image-lowlatency-lts-xenial  4.4.0.248.215
   linux-image-virtual-lts-xenial  4.4.0.248.215

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-6532-1

CVE-2023-20593, 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
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6532-1

Topics%20covered

Topics Covered

security advisory denial of service kernel information exposure ubuntu crash

Package Information

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