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Ubuntu 16.04 LTS: USN-7797-1 Linux Kernel Critical Flaws Detected

ubuntu
Calendar Grey October 2, 2025
Dist Ubuntu Esm H88
Ubuntu 16.04 LTS security patch addresses several kernel issues to prevent system compromise. Update instructions provided.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

- linux-kvm: Linux kernel for cloud environments

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:

- Virtio block driver;

- Media drivers;

- Network drivers;

- Framebuffer layer;

- BTRFS file system;

- Ext4 file system;

- Network file system (NFS) server daemon;

- Packet sockets;

- VMware vSockets driver;

(CVE-2025-38618, CVE-2024-35849, CVE-2025-37785, CVE-2024-49924,

CVE-2025-38617, CVE-2024-27078, CVE-2021-47149, CVE-2021-47319,

CVE-2025-21796, CVE-2021-47589)

Topics%20covered

Topics Covered

security advisory kernel update critical Ubuntu system compromise Linux kernel

Update Instructions

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

Ubuntu 16.04 LTS
  linux-image-4.4.0-1149-kvm      4.4.0-1149.160
                                  Available with Ubuntu Pro
  linux-image-4.4.0-273-generic   4.4.0-273.307
                                  Available with Ubuntu Pro
  linux-image-4.4.0-273-lowlatency  4.4.0-273.307
                                  Available with Ubuntu Pro
  linux-image-generic             4.4.0.273.279
                                  Available with Ubuntu Pro
  linux-image-generic-lts-xenial  4.4.0.273.279
                                  Available with Ubuntu Pro
  linux-image-kvm                 4.4.0.1149.146
                                  Available with Ubuntu Pro
  linux-image-lowlatency          4.4.0.273.279
                                  Available with Ubuntu Pro
  linux-image-lowlatency-lts-xenial  4.4.0.273.279
                                  Available with Ubuntu Pro
  linux-image-virtual             4.4.0.273.279
                                  Available with Ubuntu Pro
  linux-image-virtual-lts-xenial  4.4.0.273.279
                                  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-7797-1

CVE-2021-47149, CVE-2021-47319, CVE-2021-47589, CVE-2024-27078,

CVE-2024-35849, CVE-2024-49924, CVE-2025-21796, CVE-2025-37785,

CVE-2025-38617, CVE-2025-38618

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7797-1

Topics%20covered

Topics Covered

security advisory kernel update critical Ubuntu system compromise Linux kernel

Package Information

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