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Ubuntu 16.04 LTS USN-6646-1 Critical: Kernel Denial of Service Risk

ubuntu
Calendar Grey February 20, 2024
Dist Ubuntu Esm H88
A variety of significant vulnerabilities have been patched in the Linux kernel impacting Ubuntu environments, necessitating prompt 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-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

It was discovered that a race condition existed in the ATM (Asynchronous

Transfer Mode) subsystem of the Linux kernel, leading to 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-2023-51780)

It was discovered that a race condition existed in the Rose X.25 protocol

implementation in the Linux kernel, leading to 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-2023-51782)

It was discovered that the netfilter connection tracker for netlink in the

Linux kernel did not p...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu kernel linux kernel

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-4.4.0-1129-kvm      4.4.0-1129.139
   linux-image-4.4.0-1166-aws      4.4.0-1166.181
   linux-image-4.4.0-251-generic   4.4.0-251.285
   linux-image-4.4.0-251-lowlatency  4.4.0-251.285
   linux-image-aws                 4.4.0.1166.170
   linux-image-generic             4.4.0.251.257
   linux-image-generic-lts-xenial  4.4.0.251.257
   linux-image-kvm                 4.4.0.1129.126
   linux-image-lowlatency          4.4.0.251.257
   linux-image-lowlatency-lts-xenial  4.4.0.251.257
   linux-image-virtual             4.4.0.251.257
   linux-image-virtual-lts-xenial  4.4.0.251.257

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   linux-image-4.4.0-1128-aws      4.4.0-1128.134
   linux-image-4.4.0-251-generic   4.4.0-251.285~14.04.1
   linux-image-4.4.0-251-lowlatency  4.4.0-251.285~14.04.1
   linux-image-aws                 4.4.0.1128.125

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-6646-1

CVE-2023-51780, CVE-2023-51782, CVE-2023-7192

Severity
critical
Lowest
Low
Medium
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Critical

Ubuntu Security Notice USN-6646-1

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu kernel linux kernel

Package Information

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