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Ubuntu 20.04 5.4 Kernel Important Privilege Escalation USN-8098-4

ubuntu
Calendar Grey March 24, 2026
Dist Ubuntu Esm H88
Multiple security issues resolved in the Linux kernel for Ubuntu, impacting system integrity and privileges.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-ibm: Linux kernel for IBM cloud systems

- linux-hwe-5.4: Linux hardware enablement (HWE) kernel

Details:

Qualys discovered that several vulnerabilities existed in the AppArmor

Linux kernel Security Module (LSM). An unprivileged local attacker could

use these issues to load, replace, and remove arbitrary AppArmor profiles

causing denial of service, exposure of sensitive information (kernel

memory), local privilege escalation, or possibly escape a container.

(LP: #2143853)

Several security issues were discovered in the Linux kernel.

An attacker could possibly use these to compromise the system.

This update corrects flaws in the following subsystems:

- x86 architecture;

- GPIO subsystem;

- GPU drivers;

- MMC subsystem;

- BTRFS file system;

- XFRM subsystem;

- IPv4 networking;

- IPv6 networking;

- MAC80211 subsystem;

- SMC sockets;

(CVE-2021-47599, CVE-2022-48875, CVE-2022-490...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service local privilege escalation Ubuntu important Linux kernel

Update Instructions

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

Ubuntu 20.04 LTS
  linux-image-5.4.0-1102-ibm      5.4.0-1102.107
                                  Available with Ubuntu Pro
  linux-image-ibm-5.4             5.4.0.1102.131
                                  Available with Ubuntu Pro
  linux-image-ibm-lts-20.04       5.4.0.1102.131
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  linux-image-5.4.0-227-generic   5.4.0-227.247~18.04.1
                                  Available with Ubuntu Pro
  linux-image-5.4.0-227-lowlatency  5.4.0-227.247~18.04.1
                                  Available with Ubuntu Pro
  linux-image-generic-5.4         5.4.0.227.247~18.04.1
                                  Available with Ubuntu Pro
  linux-image-generic-hwe-18.04   5.4.0.227.247~18.04.1
                                  Available with Ubuntu Pro
  linux-image-lowlatency-5.4      5.4.0.227.247~18.04.1
                                  Available with Ubuntu Pro
  linux-image-lowlatency-hwe-18.04  5.4.0.227.247~18.04.1
                                  Available with Ubuntu Pro
  linux-image-oem                 5.4.0.227.247~18.04.1
                                  Available with Ubuntu Pro
  linux-image-oem-osp1            5.4.0.227.247~18.04.1
                                  Available with Ubuntu Pro
  linux-image-snapdragon-5.4      5.4.0.227.247~18.04.1
                                  Available with Ubuntu Pro
  linux-image-snapdragon-hwe-18.04  5.4.0.227.247~18.04.1
                                  Available with Ubuntu Pro
  linux-image-virtual-5.4         5.4.0.227.247~18.04.1
                                  Available with Ubuntu Pro
  linux-image-virtual-hwe-18.04   5.4.0.227.247~18.04.1
                                  Available with Ubuntu Pro

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-8098-4

https://ubuntu.com/security/notices/USN-8098-3

https://ubuntu.com/security/notices/USN-8098-2

https://ubuntu.com/security/notices/USN-8098-1

https://launchpad.net/bugs/2143853

CVE-2021-47599, CVE-2022-48875, CVE-2022-49072, CVE-2022-49267,

CVE-2024-49927, CVE-2024-56640, CVE-2025-21780, CVE-2025-40215,

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8098-4

Topics%20covered

Topics Covered

security advisory denial of service local privilege escalation Ubuntu important Linux kernel

Package Information

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