Ubuntu alert USN-8098-4 (linux-hwe-5.4, linux-ibm)

From:
             
 
Giampaolo Fresi Roglia <giampaolo.fresi.roglia@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-8098-4] Linux kernel vulnerabilities
Date:
             
 
Tue, 24 Mar 2026 09:38:57 +0100
Message-ID:
             
 
<ap4oulikalvcym.fsf@canonical.com>
==========================================================================
Ubuntu Security Notice USN-8098-4
March 24, 2026

linux-hwe-5.4, linux-ibm vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

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-2022-49072, CVE-2022-49267,
CVE-2024-49927, CVE-2024-56640, CVE-2025-21780, CVE-2025-40215)

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,



Attachment: signature.asc (type=application/pgp-signature)
-----BEGIN PGP SIGNATURE-----

iQHZBAEBCgBDFiEEBcMY+nwS2CY71sUWc4vdAqvdlsYFAmnCTaElHGdpYW1wYW9s
by5mcmVzaS5yb2dsaWFAY2Fub25pY2FsLmNvbQAKCRBzi90Cq92WxsNZC/4g0eMs
wzQGF6tk3Ps0yGsf+pQ1CHnmv5ZWQyIVTrgXNkYUIFJ/ulvivAZ0AxTA4UvpcOsq
twoTcZ0d87QUsyVjGHvfC5HOk1kcPbB1Dx9mf2q4zf/iP1XD9tyTt2IQR0wX9+GC
mQ46g305KWrA8Rd/ILP3J0VBrR+xq5ePFqe3vEJmWYLxAgsOTcDXXmGbYslwhEGD
87WmRrpOGKuOY1IrkDtZZuphOw/KWBoszCkpi8UrqsF4HYD/SK3cNXEOMpucFKsu
qy6vYV2Fw3/j5bTOO63ch0SbIfqG/RA5yP3V0bRcjRsKqkTf9y8cDMoKkGUjC/zI
tg1cRnTdOCN4UfDNprO8wF1bax/izfCM8BNmvXhfHTIVNgXMi+83jpOLc4EGYLlI
XqqJfyYsMruJz5zlob6PrIsk7ofzgbaIR6lwiSCJtsOVZCrJ/wz+gUY/VVuNv4QB
/OhvhctdJzVEkWtx9pVdPaeMfYONgmg2VA5lEJ1nh9B1C/87RdRBlQ7vkJY=
=toqF
-----END PGP SIGNATURE-----