Home / mailings [USN-9033-1] Linux kernel vulnerabilities
Posted on 10 November 2026
Ubuntu Security==========================================================================Ubuntu Security Notice USN-9033-1
November 10, 2026
linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-kvm: Linux kernel for cloud environments
- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
Details:
Demi Marie Obenour and Simon Gaiser discovered that several Xen para-
virtualization device frontends did not properly restrict the access rights
of device backends. An attacker could possibly use a malicious Xen backend
to gain access to memory pages of a guest VM or cause a denial of service
in the guest. (CVE-2022-23036, CVE-2022-23037)
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:
- GPU drivers;
- IIO ADC drivers;
- Multiple devices driver;
- Ethernet bonding driver;
- Network drivers;
- PCI subsystem;
- VFIO drivers;
- File systems infrastructure;
- F2FS file system;
- JFS file system;
- Network file system (NFS) server daemon;
- OCFS2 file system;
- Overlay file system;
- Tracing infrastructure;
- IUCV driver;
(CVE-2021-47633, CVE-2022-49058, CVE-2022-49170, CVE-2023-52784,
CVE-2024-53194, CVE-2024-53210, CVE-2024-53214, CVE-2024-56570,
CVE-2024-56616, CVE-2024-56763, CVE-2024-56779, CVE-2024-57904,
CVE-2025-21664, CVE-2025-38604, CVE-2025-39743, CVE-2026-43456,
CVE-2026-74350)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 LTS
linux-image-4.4.0-1163-kvm 4.4.0-1163.174
Available with Ubuntu Pro
linux-image-4.4.0-1200-aws 4.4.0-1200.215
Available with Ubuntu Pro
linux-image-4.4.0-291-generic 4.4.0-291.325
Available with Ubuntu Pro
linux-image-4.4.0-291-lowlatency 4.4.0-291.325
Available with Ubuntu Pro
linux-image-aws 4.4.0.1200.204
Available with Ubuntu Pro
linux-image-generic 4.4.0.291.297
Available with Ubuntu Pro
linux-image-generic-lts-xenial 4.4.0.291.297
Available with Ubuntu Pro
linux-image-kvm 4.4.0.1163.160
Available with Ubuntu Pro
linux-image-lowlatency 4.4.0.291.297
Available with Ubuntu Pro
linux-image-lowlatency-lts-xenial 4.4.0.291.297
Available with Ubuntu Pro
linux-image-virtual 4.4.0.291.297
Available with Ubuntu Pro
linux-image-virtual-lts-xenial 4.4.0.291.297
Available with Ubuntu Pro
Ubuntu 14.04 LTS
linux-image-4.4.0-291-generic 4.4.0-291.325~14.04.1
Available with Ubuntu Pro
linux-image-4.4.0-291-lowlatency 4.4.0-291.325~14.04.1
Available with Ubuntu Pro
linux-image-generic-lts-xenial 4.4.0.291.325~14.04.1
Available with Ubuntu Pro
linux-image-lowlatency-lts-xenial 4.4.0.291.325~14.04.1
Available with Ubuntu Pro
linux-image-virtual-lts-xenial 4.4.0.291.325~14.04.1
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-9033-1
CVE-2021-47633, CVE-2022-23036, CVE-2022-23037, CVE-2022-49058,
CVE-2022-49170, CVE-2023-52784, CVE-2024-53194, CVE-2024-53210,
CVE-2024-53214, CVE-2024-56570, CVE-2024-56616, CVE-2024-56763,
CVE-2024-56779, CVE-2024-57904, CVE-2025-21664, CVE-2025-38604,
CVE-2025-39743, CVE-2026-43456, CVE-2026-74350
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