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Ubuntu 23.10 USN-6454-1 Critical: Kernel Issues Leading To DoS

ubuntu
Calendar Grey October 26, 2023
Dist Ubuntu Esm H88
Ubuntu's Linux kernel revamped to address vulnerabilities affecting local efficiency and presenting denial of service threats.
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-lowlatency: Linux low latency kernel

Details:

Kyle Zeng discovered that the netfilter subsystem in the Linux kernel

contained a race condition in IP set operations in certain situations. A

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

(CVE-2023-42756)

Alex Birnberg discovered that the netfilter subsystem in the Linux kernel

did not properly validate register length, leading to an out-of- bounds

write vulnerability. A local attacker could possibly use this to cause a

denial of service (system crash). (CVE-2023-4881)

It was discovered that the Quick Fair Queueing scheduler implementation in

the Linux kernel did not properly handle network packets in certain

conditions, 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. ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu kernel service disruption

Update Instructions

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

Ubuntu 23.10:
   linux-image-6.5.0-10-generic    6.5.0-10.10
   linux-image-6.5.0-10-generic-64k  6.5.0-10.10
   linux-image-6.5.0-10-lowlatency  6.5.0-10.10.1
   linux-image-6.5.0-10-lowlatency-64k  6.5.0-10.10.1
   linux-image-generic             6.5.0.10.12
   linux-image-generic-64k         6.5.0.10.12
   linux-image-generic-lpae        6.5.0.10.12
   linux-image-kvm                 6.5.0.10.12
   linux-image-lowlatency          6.5.0.10.10.10
   linux-image-lowlatency-64k      6.5.0.10.10.10
   linux-image-virtual             6.5.0.10.12

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-6454-1

CVE-2023-42756, CVE-2023-4881, CVE-2023-4921, CVE-2023-5197

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6454-1

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu kernel service disruption

Package Information

https://launchpad.net/ubuntu/+source/linux/6.5.0-10.10
https://launchpad.net/ubuntu/+source/linux-lowlatency/6.5.0-10.10.1

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