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==========================================================================
Ubuntu Security Notice USN-7863-1
November 06, 2025
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:
Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered
that the Linux kernel contained insufficient branch predictor isolation
between a guest and a userspace hypervisor for certain processors. This
flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this
to expose sensitive information from the host OS. (CVE-2025-40300)
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:
- DMA engine subsystem;
- GPU drivers;
- HSI subsystem;
- Ethernet team driver;
- TTY drivers;
- Ext4 file system;
- Timer subsystem;
- DCCP (Datagram Congestion Control Protocol);
- IPv6 networking;
- NET/ROM layer;
- SCTP protocol;
- USB sound devices;
(CVE-2021-47294, CVE-2021-47330, CVE-2023-52574, CVE-2023-52650,
CVE-2024-50006, CVE-2024-50299, CVE-2024-53124, CVE-2024-53150,
CVE-2024-56767, CVE-2025-37838, CVE-2025-38352)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 LTS
linux-image-4.4.0-1150-kvm 4.4.0-1150.161
Available with Ubuntu Pro
linux-image-4.4.0-1187-aws 4.4.0-1187.202
Available with Ubuntu Pro
linux-image-4.4.0-274-generic 4.4.0-274.308
Available with Ubuntu Pro
linux-image-4.4.0-274-lowlatency 4.4.0-274.308
Available with Ubuntu Pro
linux-image-aws 4.4.0.1187.191
Available with Ubuntu Pro
linux-image-generic 4.4.0.274.280
Available with Ubuntu Pro
linux-image-generic-lts-xenial 4.4.0.274.280
Available with Ubuntu Pro
linux-image-kvm 4.4.0.1150.147
Available with Ubuntu Pro
linux-image-lowlatency 4.4.0.274.280
Available with Ubuntu Pro
linux-image-lowlatency-lts-xenial 4.4.0.274.280
Available with Ubuntu Pro
linux-image-virtual 4.4.0.274.280
Available with Ubuntu Pro
linux-image-virtual-lts-xenial 4.4.0.274.280
Available with Ubuntu Pro
Ubuntu 14.04 LTS
linux-image-4.4.0-1149-aws 4.4.0-1149.155
Available with Ubuntu Pro
linux-image-4.4.0-274-generic 4.4.0-274.308~14.04.1
Available with Ubuntu Pro
linux-image-4.4.0-274-lowlatency 4.4.0-274.308~14.04.1
Available with Ubuntu Pro
linux-image-aws 4.4.0.1149.146
Available with Ubuntu Pro
linux-image-generic-lts-xenial 4.4.0.274.308~14.04.1
Available with Ubuntu Pro
linux-image-lowlatency-lts-xenial 4.4.0.274.308~14.04.1
Available with Ubuntu Pro
linux-image-virtual-lts-xenial 4.4.0.274.308~14.04.1
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-7863-1
CVE-2021-47294, CVE-2021-47330, CVE-2023-52574, CVE-2023-52650,
CVE-2024-50006, CVE-2024-50299, CVE-2024-53124, CVE-2024-53150,
CVE-2024-56767, CVE-2025-37838, CVE-2025-38352, CVE-2025-40300
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