Ubuntu 23.04 USN-6338-1 Critical: Kernel Crashes Resolved

ubuntu

September 5, 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-kvm: Linux kernel for cloud environments

- linux-lowlatency: Linux low latency kernel

- linux-raspi: Linux kernel for Raspberry Pi systems

- linux-aws-6.2: Linux kernel for Amazon Web Services (AWS) systems

- linux-hwe-6.2: Linux hardware enablement (HWE) kernel

- linux-lowlatency-hwe-6.2: Linux low latency kernel

Details:

Zi Fan Tan discovered that the binder IPC implementation in the Linux

kernel contained 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-2023-21255)

It was discovered that a race condition existed in the f2fs file system in

the Linux kernel, leading to a null pointer dereference vulnerability. An

attacker could use this to construct a malicious f2fs image that, when

moun...

Read the Full Advisory

Topics Covered

security advisory DoS Ubuntu memory exhaustion kernel crash use-after-free

Update Instructions

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

Ubuntu 23.04:
   linux-image-6.2.0-1011-aws      6.2.0-1011.11
   linux-image-6.2.0-1012-kvm      6.2.0-1012.12
   linux-image-6.2.0-1012-lowlatency  6.2.0-1012.12
   linux-image-6.2.0-1012-lowlatency-64k  6.2.0-1012.12
   linux-image-6.2.0-1012-raspi    6.2.0-1012.14
   linux-image-6.2.0-32-generic    6.2.0-32.32
   linux-image-6.2.0-32-generic-64k  6.2.0-32.32
   linux-image-6.2.0-32-generic-lpae  6.2.0-32.32
   linux-image-aws                 6.2.0.1011.12
   linux-image-generic             6.2.0.32.32
   linux-image-generic-64k         6.2.0.32.32
   linux-image-generic-lpae        6.2.0.32.32
   linux-image-kvm                 6.2.0.1012.12
   linux-image-lowlatency          6.2.0.1012.12
   linux-image-lowlatency-64k      6.2.0.1012.12
   linux-image-raspi               6.2.0.1012.15
   linux-image-raspi-nolpae        6.2.0.1012.15
   linux-image-virtual             6.2.0.32.32

Ubuntu 22.04 LTS:
   linux-image-6.2.0-1011-aws      6.2.0-1011.11~22.04.1
   linux-image-6.2.0-1012-lowlatency  6.2.0-1012.12~22.04.1
   linux-image-6.2.0-1012-lowlatency-64k  6.2.0-1012.12~22.04.1
   linux-image-6.2.0-32-generic    6.2.0-32.32~22.04.1
   linux-image-6.2.0-32-generic-64k  6.2.0-32.32~22.04.1
   linux-image-6.2.0-32-generic-lpae  6.2.0-32.32~22.04.1
   linux-image-aws                 6.2.0.1011.11~22.04.1
   linux-image-generic-64k-hwe-22.04  6.2.0.32.32~22.04.9
   linux-image-generic-hwe-22.04   6.2.0.32.32~22.04.9
   linux-image-generic-lpae-hwe-22.04  6.2.0.32.32~22.04.9
   linux-image-lowlatency-64k-hwe-22.04  6.2.0.1012.12~22.04.9
   linux-image-lowlatency-hwe-22.04  6.2.0.1012.12~22.04.9
   linux-image-virtual-hwe-22.04   6.2.0.32.32~22.04.9

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.