Ubuntu 23.04: USN-6338-2 Critical Denial Of Service Issues

ubuntu

September 8, 2023

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

- linux-ibm: Linux kernel for IBM cloud systems

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-starfive: Linux kernel for StarFive processors

- linux-gcp-6.2: Linux kernel for Google Cloud Platform (GCP) systems

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

mounted and operated on, could cause a denial of service (system crash).

(CVE-2023-2898)

It was discovered that the DVB Core driver in the Linu...

Read the Full Advisory

Topics Covered

security advisory Ubuntu kernel Denial of Service memory exhaustion system 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-6.2.0-1004-starfive  6.2.0-1004.5
  linux-image-6.2.0-1009-ibm      6.2.0-1009.9
  linux-image-6.2.0-1011-oracle   6.2.0-1011.11
  linux-image-6.2.0-1013-gcp      6.2.0-1013.13
  linux-image-gcp                 6.2.0.1013.13
  linux-image-ibm                 6.2.0.1009.9
  linux-image-oracle              6.2.0.1011.11
  linux-image-starfive            6.2.0.1004.7

Ubuntu 22.04 LTS:
  linux-image-6.2.0-1013-gcp      6.2.0-1013.13~22.04.1
  linux-image-gcp                 6.2.0.1013.13~22.04.1

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.