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Ubuntu 20.04 HWE Kernel Critical Security Flaws USN-8188-1

ubuntu
Calendar Grey April 17, 2026
Dist Ubuntu Esm H88
Several security issues fixed in Ubuntu's hardware enablement kernel, critical risks require immediate updates for the system.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-hwe-5.15: Linux hardware enablement (HWE) kernel

Details:

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:

- ARM64 architecture;

- Block layer subsystem;

- Cryptographic API;

- Drivers core;

- Bluetooth drivers;

- DMA engine subsystem;

- GPU drivers;

- HID subsystem;

- Intel Trace Hub HW tracing drivers;

- IIO ADC drivers;

- IRQ chip drivers;

- Modular ISDN driver;

- LED subsystem;

- UACCE accelerator framework;

- Ethernet bonding driver;

- Network drivers;

- STMicroelectronics network drivers;

- Ethernet team driver;

- NVME drivers;

- PHY drivers;

- SLIMbus drivers;

- W1 Dallas's 1-wire bus driver;

- Xen hypervisor drivers;

- BTRFS file system;

- Ext4 file system;

- Network file system (NFS) client;

- Network fi...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory critical Ubuntu kernel attack linux hwe

Update Instructions

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

Ubuntu 20.04 LTS
  linux-image-5.15.0-176-generic  5.15.0-176.186~20.04.1
                                  Available with Ubuntu Pro
  linux-image-5.15.0-176-generic-64k  5.15.0-176.186~20.04.1
                                  Available with Ubuntu Pro
  linux-image-5.15.0-176-generic-lpae  5.15.0-176.186~20.04.1
                                  Available with Ubuntu Pro
  linux-image-generic-5.15        5.15.0.176.186~20.04.1
                                  Available with Ubuntu Pro
  linux-image-generic-64k-5.15    5.15.0.176.186~20.04.1
                                  Available with Ubuntu Pro
  linux-image-generic-64k-hwe-20.04  5.15.0.176.186~20.04.1
                                  Available with Ubuntu Pro
  linux-image-generic-hwe-20.04   5.15.0.176.186~20.04.1
                                  Available with Ubuntu Pro
  linux-image-generic-lpae-5.15   5.15.0.176.186~20.04.1
                                  Available with Ubuntu Pro
  linux-image-generic-lpae-hwe-20.04  5.15.0.176.186~20.04.1
                                  Available with Ubuntu Pro
  linux-image-oem-20.04           5.15.0.176.186~20.04.1
                                  Available with Ubuntu Pro
  linux-image-oem-20.04b          5.15.0.176.186~20.04.1
                                  Available with Ubuntu Pro
  linux-image-oem-20.04c          5.15.0.176.186~20.04.1
                                  Available with Ubuntu Pro
  linux-image-oem-20.04d          5.15.0.176.186~20.04.1
                                  Available with Ubuntu Pro
  linux-image-virtual-5.15        5.15.0.176.186~20.04.1
                                  Available with Ubuntu Pro
  linux-image-virtual-hwe-20.04   5.15.0.176.186~20.04.1
                                  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-8188-1

CVE-2023-53421, CVE-2023-53520, CVE-2023-53662, CVE-2023-54207,

CVE-2025-37849, CVE-2025-38057, CVE-2025-38125, CVE-2025-38232,

CVE-2025-38408, CVE-2025-38591, CVE-2025-40149, CVE-2025-40164,

CVE-2025-68211, CVE-2025-68340, CVE-2025-68365, CVE-2025-68725,

CVE-2025-68817, CVE-2025-71162, CVE-2025-71163, CVE-2025-71185,

CVE-2025-71186, CVE-2025-71188, CVE-2025-71190, CVE-2025-71191,

CVE-2025-71194, CVE-2025-71196, CVE-2025-71197, CVE-2025-71199,

CVE-2026-22997, CVE-2026-22998, CVE-2026-22999, CVE-2026-23001,

CVE-2026-23003, CVE-2026-23011, CVE-2026-23026, CVE-2026-23033,

CVE-2026-23037, CVE-2026-23038, CVE-2026-23049, CVE-2026-23056,

CVE-2026-23058, CVE-2026-23060, CVE-2026-23061, CVE-2026-23063,

CVE-2026-23064, CVE-2026-23071, CVE-2026-23073, CVE-2026-23074,

CVE-2026-23075, CVE-2026-23076, CVE-2026-23078, CVE-2026-23080,

CVE-2026-23083, CVE-2026-23084, CVE-2026-23085, CVE-2026-23087,

CVE-2026-23089, CVE-2026-23090, CVE-2026-23091, CVE-2026-23093,

CVE-2026-23095, CVE-2026-23096, CVE-2026-23097, CVE-2026-23098,

CVE-2026-23099, CVE-2026-23101, CVE-2026-23103, CVE-2026-23105,

CVE-2026-23108, CVE-2026-23111, CVE-2026-23119, CVE-2026-23120,

CVE-2026-23121, CVE-2026-23124, CVE-2026-23125, CVE-2026-23128,

CVE-2026-23133, CVE-2026-23145, CVE-2026-23146, CVE-2026-23150,

CVE-2026-23164, CVE-2026-23167, CVE-2026-23170, CVE-2026-23209

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8188-1

Topics%20covered

Topics Covered

security advisory critical Ubuntu kernel attack linux hwe

Package Information

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