Ubuntu 23.10: 6503-1 Critical: Kernel Denial Of Service and Use-After-Free

ubuntu

November 21, 2023

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-laptop: Linux kernel for Lenovo X13s ARM laptops

- linux-lowlatency: Linux low latency kernel

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-raspi: Linux kernel for Raspberry Pi systems

- linux-starfive: Linux kernel for StarFive processors

- linux-oem-6.5: Linux kernel for OEM systems

Details:

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)

Bien Pham discovered that the netfiler subsystem in the Linux kernel

contained a race condition, leading to a use-after-free vulnerability. A

local user could use this to cause a denial of service (system crash) or

possibly execute arbitrary code...

Read the Full Advisory

Topics Covered

security advisory DoS Ubuntu kernel system crash use-after-free

Update Instructions

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

Ubuntu 23.10:
   linux-image-6.5.0-1004-starfive  6.5.0-1004.5
   linux-image-6.5.0-1006-laptop   6.5.0-1006.9
   linux-image-6.5.0-1007-raspi    6.5.0-1007.9
   linux-image-6.5.0-1010-aws      6.5.0-1010.10
   linux-image-6.5.0-1012-oracle   6.5.0-1012.12
   linux-image-6.5.0-13-generic    6.5.0-13.13
   linux-image-6.5.0-13-generic-64k  6.5.0-13.13
   linux-image-6.5.0-13-lowlatency  6.5.0-13.13.1
   linux-image-6.5.0-13-lowlatency-64k  6.5.0-13.13.1
   linux-image-aws                 6.5.0.1010.10
   linux-image-generic             6.5.0.13.15
   linux-image-generic-64k         6.5.0.13.15
   linux-image-generic-lpae        6.5.0.13.15
   linux-image-kvm                 6.5.0.13.15
   linux-image-laptop-23.10        6.5.0.1006.9
   linux-image-lowlatency          6.5.0.13.13.11
   linux-image-lowlatency-64k      6.5.0.13.13.11
   linux-image-oracle              6.5.0.1012.12
   linux-image-raspi               6.5.0.1007.8
   linux-image-raspi-nolpae        6.5.0.1007.8
   linux-image-starfive            6.5.0.1004.6
   linux-image-virtual             6.5.0.13.15

Ubuntu 22.04 LTS:
   linux-image-6.5.0-1008-oem      6.5.0-1008.8
   linux-image-oem-22.04d          6.5.0.1008.10

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.