Ubuntu 22.04 LTS: USN-6386-3 Critical: Kernel Memory Leak Threat

ubuntu

October 3, 2023

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-intel-iotg: Linux kernel for Intel IoT platforms

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-intel-iotg-5.15: Linux kernel for Intel IoT platforms

- linux-oracle-5.15: Linux kernel for Oracle Cloud systems

Details:

Jana Hofmann, Emanuele Vannacci, Cedric Fournet, Boris Kopf, and Oleksii

Oleksenko discovered that some AMD processors could leak stale data from

division operations in certain situations. A local attacker could possibly

use this to expose sensitive information. (CVE-2023-20588)

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 execute arbitrary code. (CVE-2023-40283)

It was discovered that some network classifier implementations in the Linux

kernel co...

Read the Full Advisory

Topics Covered

security advisory denial of service critical memory leak ubuntu linux kernel

Update Instructions

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

Ubuntu 22.04 LTS:
   linux-image-5.15.0-1040-intel-iotg  5.15.0-1040.46
   linux-image-5.15.0-1044-oracle  5.15.0-1044.50
   linux-image-intel-iotg          5.15.0.1040.40
   linux-image-oracle              5.15.0.1044.39
   linux-image-oracle-lts-22.04    5.15.0.1044.39

Ubuntu 20.04 LTS:
   linux-image-5.15.0-1040-intel-iotg  5.15.0-1040.46~20.04.1
   linux-image-5.15.0-1044-oracle  5.15.0-1044.50~20.04.1
   linux-image-intel               5.15.0.1040.46~20.04.31
   linux-image-intel-iotg          5.15.0.1040.46~20.04.31
   linux-image-oracle              5.15.0.1044.50~20.04.1

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.