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Ubuntu 20.04 LTS USN-6548-2 Critical: Kernel Threat Mitigation Report

ubuntu
Calendar Grey December 12, 2023
Dist Ubuntu Esm H88
Critical flaws detected in the Linux kernel affecting Ubuntu versions 20.04 and 18.04 necessitate immediate updates.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-raspi: Linux kernel for Raspberry Pi systems

- linux-oracle-5.4: Linux kernel for Oracle Cloud systems

- linux-raspi-5.4: Linux kernel for Raspberry Pi systems

Details:

It was discovered that Spectre-BHB mitigations were missing for Ampere

processors. A local attacker could potentially use this to expose sensitive

information. (CVE-2023-3006)

It was discovered that the USB subsystem in the Linux kernel contained a

race condition while handling device descriptors in certain situations,

leading to a out-of-bounds read vulnerability. A local attacker could

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

(CVE-2023-37453)

Lucas Leong discovered that the netfilter subsystem in the Linux kernel did

not properly validate some attributes passed from userspace. A local

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

possibly expose sensitive ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel ubuntu data exposure out-of-bounds

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1100-raspi    5.4.0-1100.112
   linux-image-raspi               5.4.0.1100.130
   linux-image-raspi2              5.4.0.1100.130

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   linux-image-5.4.0-1100-raspi    5.4.0-1100.112~18.04.1
   linux-image-5.4.0-1115-oracle   5.4.0-1115.124~18.04.1
   linux-image-oracle              5.4.0.1115.124~18.04.87
   linux-image-raspi-hwe-18.04     5.4.0.1100.97

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-6548-2

https://ubuntu.com/security/notices/USN-6548-1

CVE-2023-3006, CVE-2023-37453, CVE-2023-39189, CVE-2023-39192,

CVE-2023-39193, CVE-2023-39194, CVE-2023-42754, CVE-2023-5178,

CVE-2023-5717, CVE-2023-6176

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6548-2

Topics%20covered

Topics Covered

security advisory denial of service kernel ubuntu data exposure out-of-bounds

Package Information

https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1100.112

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