Ubuntu USN · USN-8280-3

Linux kernel (IoT) vulnerabilities

Published: Tue, 26 May 2026 19:55

CVE-2026-31533CVE-2026-31431CVE-2026-31504CVE-2026-43078CVE-2026-43033CVE-2026-43077

Summary

Several security issues were fixed in the Linux kernel.

Details

It was discovered that the Linux kernel algif_aead module did not properly handle in-place cryptographic operations. This flaw is known as Copy Fail. A local attacker could use this to escalate privileges, or possibly escape a container. (CVE-2026-31431) 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: - Cryptographic API; - Packet sockets; - TLS protocol; (CVE-2026-31504, CVE-2026-31533, CVE-2026-43033, CVE-2026-43077, CVE-2026-43078)

Recommended actions per Ubuntu release

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

Ubuntu focal

linux-iot→5.4.0-1063.66apt_upgrade
Standard apt upgrade. Install 5.4.0-1063.66 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-iot
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-buildinfo-5.4.0-1063-iot→5.4.0-1063.66apt_upgrade
Standard apt upgrade. Install 5.4.0-1063.66 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-buildinfo-5.4.0-1063-iot
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-headers-5.4.0-1063-iot→5.4.0-1063.66kernel_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-5.4.0-1063-iot
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-headers-iot→5.4.0.1063.61kernel_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-iot
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-headers-iot-5.4→5.4.0.1063.61kernel_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-iot-5.4
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-5.4.0-1063-iot→5.4.0-1063.66kernel_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-5.4.0-1063-iot
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-iot→5.4.0.1063.61kernel_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-iot
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-iot-5.4→5.4.0.1063.61kernel_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-iot-5.4
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-unsigned-5.4.0-1063-iot→5.4.0-1063.66kernel_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-5.4.0-1063-iot
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-iot→5.4.0.1063.61apt_upgrade
Standard apt upgrade. Install 5.4.0.1063.61 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-iot
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-iot-5.4→5.4.0.1063.61apt_upgrade
Standard apt upgrade. Install 5.4.0.1063.61 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-iot-5.4
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-iot-headers-5.4.0-1063→5.4.0-1063.66apt_upgrade
Standard apt upgrade. Install 5.4.0-1063.66 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-iot-headers-5.4.0-1063
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-iot-tools-5.4.0-1063→5.4.0-1063.66apt_upgrade
Standard apt upgrade. Install 5.4.0-1063.66 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-iot-tools-5.4.0-1063
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-modules-5.4.0-1063-iot→5.4.0-1063.66kernel_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-5.4.0-1063-iot
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-tools-5.4.0-1063-iot→5.4.0-1063.66apt_upgrade
Standard apt upgrade. Install 5.4.0-1063.66 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-tools-5.4.0-1063-iot
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-tools-iot→5.4.0.1063.61apt_upgrade
Standard apt upgrade. Install 5.4.0.1063.61 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-tools-iot
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-tools-iot-5.4→5.4.0.1063.61apt_upgrade
Standard apt upgrade. Install 5.4.0.1063.61 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-tools-iot-5.4
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Are YOU affected by USN-8280-3?

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