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Ubuntu 20.04 LTS: USN-6462-2 Critical: Kernel IoT Crash Risks Repaired

ubuntu
Calendar Grey November 10, 2023
Dist Ubuntu Esm H88
Key kernel vulnerabilities tackled in Ubuntu 20.04 LTS, enhancing defenses against local exploitation and enhancing system stability.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-iot: Linux kernel for IoT platforms

Details:

Seth Jenkins discovered that the Linux kernel did not properly perform

address randomization for a per-cpu memory management structure. A local

attacker could use this to expose sensitive information (kernel memory) or

in conjunction with another kernel vulnerability. (CVE-2023-0597)

Yu Hao and Weiteng Chen discovered that the Bluetooth HCI UART driver in

the Linux kernel contained a race condition, leading to a null pointer

dereference vulnerability. A local attacker could use this to cause a

denial of service (system crash). (CVE-2023-31083)

Lin Ma discovered that the Netlink Transformation (XFRM) subsystem in the

Linux kernel contained a null pointer dereference vulnerability in some

situations. A local privileged attacker could use this to cause a denial of

service (system crash). (CVE-2023-3772)

It was discovered that t...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu kernel issue system crash IoT

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1025-iot      5.4.0-1025.26

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-6462-2

https://ubuntu.com/security/notices/USN-6462-1

CVE-2023-0597, CVE-2023-31083, CVE-2023-3772, CVE-2023-4132

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6462-2

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu kernel issue system crash IoT

Package Information

https://launchpad.net/ubuntu/+source/linux-iot/5.4.0-1025.26

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