Ubuntu USN · USN-8530-2

Linux kernel (HWE) vulnerabilities

Published: Thu, 13 Aug 2026 21:10

CVE-2026-23272CVE-2026-43037CVE-2026-31685CVE-2026-46119CVE-2026-43284CVE-2021-47202CVE-2026-43407CVE-2026-46243CVE-2026-31402CVE-2026-43038CVE-2026-23455CVE-2026-45988CVE-2026-31682CVE-2026-31607CVE-2026-43383CVE-2026-31659CVE-2024-56643CVE-2026-46043CVE-2026-43011CVE-2026-31637CVE-2026-43414CVE-2026-43503

Summary

Several security issues were fixed in the Linux kernel.

Details

It was discovered that the Linux kernel did not properly handle shared page fragments during socket buffer operations, collectively known as Dirty Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the RxRPC networking subsystem when processing paged fragments. A local attacker could use this to escalate privileges, or possibly escape a container. (CVE-2026-43284) It was discovered that a logic flaw existed in the XFRM ESP-in-TCP subsystem in the Linux kernel when handling socket buffer fragments. This flaw is known as Fragnesia. A local attacker could use this to escalate privileges, or possibly escape a container. (CVE-2026-43503) 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: - InfiniBand drivers; - SCSI subsystem; - Thermal drivers; - USB over IP driver; - Network file system (NFS) server daemon; - SMB network file system; - Tracing infrastructure; - B.A.T.M.A.N. meshing protocol; - Ethernet bridge; - Ceph Core library; - DCCP (Datagram Congestion Control Protocol); - IPv4 networking; - IPv6 networking; - Netfilter; - RxRPC session sockets; - X.25 network layer; (CVE-2021-47202, CVE-2024-56643, CVE-2026-23272, CVE-2026-23455, CVE-2026-31402, CVE-2026-31607, CVE-2026-31637, CVE-2026-31659, CVE-2026-31682, CVE-2026-31685, CVE-2026-43011, CVE-2026-43037, CVE-2026-43038, CVE-2026-43383, CVE-2026-43407, CVE-2026-43414, CVE-2026-45988, CVE-2026-46043, CVE-2026-46119, CVE-2026-46243)

Recommended actions per Ubuntu release

StackPatch playbook auto-generated per release codename and per affected package.

Ubuntu xenial

linux-aws-hwe→4.15.0-1194.207~16.04.1apt_upgrade
Standard apt upgrade. Install 4.15.0-1194.207~16.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-aws-hwe
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-aws-edge→4.15.0.1195.208~16.04.1apt_upgrade
Standard apt upgrade. Install 4.15.0.1195.208~16.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-aws-edge
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-aws-headers-4.15.0-1194→4.15.0-1194.207~16.04.1apt_upgrade
Standard apt upgrade. Install 4.15.0-1194.207~16.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-aws-headers-4.15.0-1194
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-aws-hwe→4.15.0.1195.208~16.04.1apt_upgrade
Standard apt upgrade. Install 4.15.0.1195.208~16.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-aws-hwe
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-aws-hwe-cloud-tools-4.15.0-1194→4.15.0-1194.207~16.04.1apt_upgrade
Standard apt upgrade. Install 4.15.0-1194.207~16.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-aws-hwe-cloud-tools-4.15.0-1194
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-aws-hwe-tools-4.15.0-1194→4.15.0-1194.207~16.04.1apt_upgrade
Standard apt upgrade. Install 4.15.0-1194.207~16.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-aws-hwe-tools-4.15.0-1194
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-buildinfo-4.15.0-1194-aws→4.15.0-1194.207~16.04.1apt_upgrade
Standard apt upgrade. Install 4.15.0-1194.207~16.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-buildinfo-4.15.0-1194-aws
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-cloud-tools-4.15.0-1194-aws→4.15.0-1194.207~16.04.1apt_upgrade
Standard apt upgrade. Install 4.15.0-1194.207~16.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-cloud-tools-4.15.0-1194-aws
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-headers-4.15.0-1194-aws→4.15.0-1194.207~16.04.1kernel_reboot
Kernel package — apt-upgrade then REBOOT to load the patched kernel.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-headers-4.15.0-1194-aws
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-headers-aws-hwe→4.15.0.1195.208~16.04.1kernel_reboot
Kernel package — apt-upgrade then REBOOT to load the patched kernel.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-headers-aws-hwe
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-4.15.0-1195-aws→4.15.0-1195.208~16.04.1kernel_reboot
Kernel package — apt-upgrade then REBOOT to load the patched kernel.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-image-4.15.0-1195-aws
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-aws-hwe→4.15.0.1195.208~16.04.1kernel_reboot
Kernel package — apt-upgrade then REBOOT to load the patched kernel.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-image-aws-hwe
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-unsigned-4.15.0-1194-aws→4.15.0-1194.207~16.04.1kernel_reboot
Kernel package — apt-upgrade then REBOOT to load the patched kernel.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-image-unsigned-4.15.0-1194-aws
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-modules-4.15.0-1194-aws→4.15.0-1194.207~16.04.1kernel_reboot
Kernel package — apt-upgrade then REBOOT to load the patched kernel.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-modules-4.15.0-1194-aws
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-modules-extra-4.15.0-1194-aws→4.15.0-1194.207~16.04.1kernel_reboot
Kernel package — apt-upgrade then REBOOT to load the patched kernel.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-modules-extra-4.15.0-1194-aws
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-modules-extra-aws-hwe→4.15.0.1195.208~16.04.1kernel_reboot
Kernel package — apt-upgrade then REBOOT to load the patched kernel.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-modules-extra-aws-hwe
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-tools-4.15.0-1194-aws→4.15.0-1194.207~16.04.1apt_upgrade
Standard apt upgrade. Install 4.15.0-1194.207~16.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-tools-4.15.0-1194-aws
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-tools-aws-hwe→4.15.0.1195.208~16.04.1apt_upgrade
Standard apt upgrade. Install 4.15.0.1195.208~16.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-tools-aws-hwe
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Are YOU affected by USN-8530-2?

5-second check on your actual server. Reads /etc/os-release, uname -r, and dpkg-query; matches against the live USN + Debian Security Tracker feeds; tells you whether USN-8530-2 (and any other live CVE) applies. Anonymous, no signup.

curl https://mindsparkstack.com/scan.sh | bash

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