========================================================================== Ubuntu Security Notice USN-8633-1 August 12, 2026
linux, linux-aws, linux-aws-fips, linux-azure-4.15, linux-azure-fips, linux-fips, linux-gcp-4.15, linux-gcp-fips, linux-kvm vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 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-aws-fips: Linux kernel for Amazon Web Services (AWS) systems with FIPS - linux-azure-4.15: Linux kernel for Microsoft Azure Cloud systems - linux-azure-fips: Linux kernel for Microsoft Azure Cloud systems with FIPS - linux-fips: Linux kernel with FIPS - linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems- linux-gcp-fips: Linux kernel for Google Cloud Platform (GCP) systems with FIPS
- linux-kvm: Linux kernel for cloud environments
Details:
Siebe Devroe, Héloïse Gollier, and Mathy Vanhoef discovered that the WiFi
implementation in the Linux kernel did not properly handle aggregated
frames in mesh networks, due to an incorrect fix for CVE-2020-24588. A
physically proximate attacker could use this issue to inject packets.
(CVE-2025-27558)
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;
- Cryptographic API;
- GPU drivers;
- InfiniBand drivers;
- Media drivers;
- NVIDIA Tegra memory controller driver;
- Network drivers;
- STMicroelectronics network drivers;
- NVME drivers;
- Ext4 file system;
- IPv4 networking;
- Network traffic control;
- TCP network protocol;
- Locking primitives;
- B.A.T.M.A.N. meshing protocol;
- Ceph Core library;
- IPv6 networking;
- Multipath TCP;
- Netfilter;
- SCTP protocol;
- SMC sockets;
(CVE-2021-47354, CVE-2021-47378, CVE-2024-38612, CVE-2026-31405,
CVE-2026-31414, CVE-2026-31448, CVE-2026-31649, CVE-2026-31657,
CVE-2026-31668, CVE-2026-43198, CVE-2026-43493, CVE-2026-43499,
CVE-2026-46266, CVE-2026-46331, CVE-2026-52924, CVE-2026-52931,
CVE-2026-52955, CVE-2026-52982, CVE-2026-52986, CVE-2026-53002,
CVE-2026-53006, CVE-2026-53045, CVE-2026-53088, CVE-2026-53176,
CVE-2026-53225, CVE-2026-53228, CVE-2026-53359)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS
linux-image-4.15.0-1150-fips 4.15.0-1150.162
Available with Ubuntu Pro
linux-image-4.15.0-1177-kvm 4.15.0-1177.182
Available with Ubuntu Pro
linux-image-4.15.0-1188-gcp 4.15.0-1188.205
Available with Ubuntu Pro
linux-image-4.15.0-1195-aws 4.15.0-1195.208
Available with Ubuntu Pro
linux-image-4.15.0-1205-azure 4.15.0-1205.220
Available with Ubuntu Pro
linux-image-4.15.0-2096-gcp-fips 4.15.0-2096.102
Available with Ubuntu Pro
linux-image-4.15.0-2113-azure-fips 4.15.0-2113.119
Available with Ubuntu Pro
linux-image-4.15.0-2133-aws-fips 4.15.0-2133.139
Available with Ubuntu Pro
linux-image-4.15.0-254-generic 4.15.0-254.266
Available with Ubuntu Pro
linux-image-4.15.0-254-lowlatency 4.15.0-254.266
Available with Ubuntu Pro
linux-image-aws-4.15 4.15.0.1195.193
Available with Ubuntu Pro
linux-image-aws-fips 4.15.0.2133.127
Available with Ubuntu Pro
linux-image-aws-fips-4.15 4.15.0.2133.127
Available with Ubuntu Pro
linux-image-aws-lts-18.04 4.15.0.1195.193
Available with Ubuntu Pro
linux-image-azure-4.15 4.15.0.1205.173
Available with Ubuntu Pro
linux-image-azure-fips 4.15.0.2113.109
Available with Ubuntu Pro
linux-image-azure-fips-4.15 4.15.0.2113.109
Available with Ubuntu Pro
linux-image-azure-lts-18.04 4.15.0.1205.173
Available with Ubuntu Pro
linux-image-fips 4.15.0.1150.147
Available with Ubuntu Pro
linux-image-gcp-4.15 4.15.0.1188.201
Available with Ubuntu Pro
linux-image-gcp-fips 4.15.0.2096.94
Available with Ubuntu Pro
linux-image-gcp-fips-4.15 4.15.0.2096.94
Available with Ubuntu Pro
linux-image-gcp-lts-18.04 4.15.0.1188.201
Available with Ubuntu Pro
linux-image-generic 4.15.0.254.238
Available with Ubuntu Pro
linux-image-kvm 4.15.0.1177.168
Available with Ubuntu Pro
linux-image-lowlatency 4.15.0.254.238
Available with Ubuntu Pro
linux-image-virtual 4.15.0.254.238
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-8633-1
CVE-2021-47354, CVE-2021-47378, CVE-2024-38612, CVE-2025-27558,
CVE-2026-31405, CVE-2026-31414, CVE-2026-31448, CVE-2026-31649,
CVE-2026-31657, CVE-2026-31668, CVE-2026-43198, CVE-2026-43493,
CVE-2026-43499, CVE-2026-46266, CVE-2026-46331, CVE-2026-52924,
CVE-2026-52931, CVE-2026-52955, CVE-2026-52982, CVE-2026-52986,
CVE-2026-53002, CVE-2026-53006, CVE-2026-53045, CVE-2026-53088,
CVE-2026-53176, CVE-2026-53225, CVE-2026-53228, CVE-2026-53359
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