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Ubuntu 22.04 LTS: USN-6343-1 Critical: Kernel Denial Of Service Threats

ubuntu
Calendar Grey September 6, 2023
Dist Ubuntu Esm H88
Safeguard your Ubuntu 22.04 LTS system by applying critical kernel updates that target various security flaws.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-oem-6.1: Linux kernel for OEM systems

Details:

It was discovered that the IPv6 implementation in the Linux kernel

contained a high rate of hash collisions in connection lookup table. A

remote attacker could use this to cause a denial of service (excessive CPU

consumption). (CVE-2023-1206)

Ross Lagerwall discovered that the Xen netback backend driver in the Linux

kernel did not properly handle certain unusual packets from a

paravirtualized network frontend, leading to a buffer overflow. An attacker

in a guest VM could use this to cause a denial of service (host system

crash) or possibly execute arbitrary code. (CVE-2023-34319)

It was discovered that the bluetooth subsystem in the Linux kernel did not

properly handle L2CAP socket release, leading to a use-after-free

vulnerability. A local attacker could use this to cause a denial of service

(system crash) or possibly execu...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow Ubuntu kernel exFAT

Update Instructions

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

Ubuntu 22.04 LTS:
   linux-image-6.1.0-1021-oem      6.1.0-1021.21
   linux-image-oem-22.04c          6.1.0.1021.21

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-6343-1

CVE-2023-1206, CVE-2023-34319, CVE-2023-40283, CVE-2023-4128,

CVE-2023-4155, CVE-2023-4194, CVE-2023-4273

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6343-1

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow Ubuntu kernel exFAT

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-6.1/6.1.0-1021.21

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