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Ubuntu 20.04 LTS USN-6726-2 Critical: Kernel DoS Issues Fixed

ubuntu
Calendar Grey April 16, 2024
Dist Ubuntu Esm H88
Ubuntu 20.04 LTS has been updated with critical kernel patches addressing various vulnerabilities, bolstering overall system security.
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:

Pratyush Yadav discovered that the Xen network backend implementation in

the Linux kernel did not properly handle zero length data request, leading

to a null pointer dereference vulnerability. An attacker in a guest VM

could possibly use this to cause a denial of service (host domain crash).

(CVE-2023-46838)

It was discovered that the IPv6 implementation of the Linux kernel did not

properly manage route cache memory usage. A remote attacker could use this

to cause a denial of service (memory exhaustion). (CVE-2023-52340)

It was discovered that the device mapper driver in the Linux kernel did not

properly validate target size during certain memory allocations. A local

attacker could use this to cause a denial of service (system crash).

(CVE-2023-52429, CVE-2024-23851)

Dan Carpenter discovered that the netfilter subsystem in t...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory kernel update critical DoS ubuntu system crash linux-iot

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1034-iot      5.4.0-1034.35

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-6726-2

https://ubuntu.com/security/notices/USN-6726-1

CVE-2023-46838, CVE-2023-52340, CVE-2023-52429, CVE-2023-52436,

CVE-2023-52438, CVE-2023-52439, CVE-2023-52443, CVE-2023-52444,

CVE-2023-52445, CVE-2023-52448, CVE-2023-52449, CVE-2023-52451,

CVE-2023-52454, CVE-2023-52457, CVE-2023-52464, CVE-2023-52469,

CVE-2023-52470, CVE-2023-52609, CVE-2023-52612, CVE-2024-0607,

CVE-2024-23851, CVE-2024-26597, CVE-2024-26633

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6726-2

Topics%20covered

Topics Covered

security advisory kernel update critical DoS ubuntu system crash linux-iot

Package Information

https://launchpad.net/ubuntu/+source/linux-iot/5.4.0-1034.35

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