Ubuntu USN · USN-8461-1

Linux kernel (Azure) vulnerabilities

Published: Mon, 22 Jun 2026 22:51

CVE-2026-43284CVE-2026-46000CVE-2026-46333CVE-2026-47328CVE-2026-46300CVE-2026-46323CVE-2026-47329CVE-2026-43503CVE-2026-43500CVE-2026-47330CVE-2026-47337CVE-2026-47334CVE-2026-43494CVE-2026-47326CVE-2026-47332CVE-2026-47327CVE-2026-47333CVE-2026-45998

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, CVE-2026-43500, CVE-2026-45998, CVE-2026-46000) 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, CVE-2026-46300) Qualys discovered that a race condition existed in the ptrace subsystem of the Linux kernel when privileged processes are exiting. An unprivileged local attacker could use this issue to expose sensitive information. (CVE-2026-46333) Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contain a memory leak when handling AppArmor notifications. A local attacker could use this to cause resource exhaustion. (CVE-2026-47326) Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contain a NULL pointer dereference when handling AppArmor notifications. A local attacker could use this to cause a kernel oops. (CVE-2026-47327) Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained an invalid free when handling AppArmor notifications. A local attacker could use this to corrupt kernel memory. (CVE-2026-47328) Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained insufficient validation of AppArmor notification responses. A local attacker could use this to allow crafted responses to be processed. (CVE-2026-47329) Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 used an uninitialized variable when handling AppArmor notifications. A local attacker could use this to cause incorrect caching of data. (CVE-2026-47330) Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained an out-of-bounds (OOB) read when handling AppArmor notifications. A local attacker could use this to cause information disclosure of kernel memory. (CVE-2026-47332) Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained a out-of-bounds (OOB) read when handling AppArmor notifications. A local attacker could use this to cause kernel memory corruption and, theoretically, influence processing of AppArmor policies. (CVE-2026-47333) Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained incorrect holding of locks when handling AppArmor notifications. A local attacker could use this to cause a kernel panic or deadlock. (CVE-2026-47334) Tristan Madani and Trevor Lawrence have each independently discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained a NULL pointer dereference when handling AppArmor network socket mediation. A local attacker could use this to cause a kernel oops. (CVE-2026-47337) 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: - Networking core; - RDS protocol; (CVE-2026-43494, CVE-2026-46323)

Recommended actions per Ubuntu release

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

Ubuntu resolute

linux-azure→7.0.0-1007.7apt_upgrade
Standard apt upgrade. Install 7.0.0-1007.7 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-azure
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-azure→7.0.0-1007.7apt_upgrade
Standard apt upgrade. Install 7.0.0-1007.7 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-azure
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-azure-7.0→7.0.0-1007.7apt_upgrade
Standard apt upgrade. Install 7.0.0-1007.7 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-azure-7.0
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-azure-cloud-tools-7.0.0-1007→7.0.0-1007.7apt_upgrade
Standard apt upgrade. Install 7.0.0-1007.7 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-azure-cloud-tools-7.0.0-1007
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-azure-headers-7.0.0-1007→7.0.0-1007.7apt_upgrade
Standard apt upgrade. Install 7.0.0-1007.7 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-azure-headers-7.0.0-1007
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-azure-tools-7.0.0-1007→7.0.0-1007.7apt_upgrade
Standard apt upgrade. Install 7.0.0-1007.7 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-azure-tools-7.0.0-1007
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-buildinfo-7.0.0-1007-azure→7.0.0-1007.7apt_upgrade
Standard apt upgrade. Install 7.0.0-1007.7 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-buildinfo-7.0.0-1007-azure
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-cloud-tools-7.0.0-1007-azure→7.0.0-1007.7apt_upgrade
Standard apt upgrade. Install 7.0.0-1007.7 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-cloud-tools-7.0.0-1007-azure
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-cloud-tools-azure→7.0.0-1007.7apt_upgrade
Standard apt upgrade. Install 7.0.0-1007.7 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-cloud-tools-azure
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-cloud-tools-azure-7.0→7.0.0-1007.7apt_upgrade
Standard apt upgrade. Install 7.0.0-1007.7 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-cloud-tools-azure-7.0
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-headers-7.0.0-1007-azure→7.0.0-1007.7kernel_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-7.0.0-1007-azure
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-headers-azure→7.0.0-1007.7kernel_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-azure
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-headers-azure-7.0→7.0.0-1007.7kernel_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-azure-7.0
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-7.0.0-1007-azure→7.0.0-1007.7kernel_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-7.0.0-1007-azure
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-azure→7.0.0-1007.7kernel_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-azure
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-azure-7.0→7.0.0-1007.7kernel_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-azure-7.0
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-uc-7.0.0-1007-azure→7.0.0-1007.7kernel_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-uc-7.0.0-1007-azure
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-unsigned-7.0.0-1007-azure→7.0.0-1007.7kernel_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-7.0.0-1007-azure
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-modules-7.0.0-1007-azure→7.0.0-1007.7kernel_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-7.0.0-1007-azure
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-tools-7.0.0-1007-azure→7.0.0-1007.7apt_upgrade
Standard apt upgrade. Install 7.0.0-1007.7 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-tools-7.0.0-1007-azure
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-tools-azure→7.0.0-1007.7apt_upgrade
Standard apt upgrade. Install 7.0.0-1007.7 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-tools-azure
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-tools-azure-7.0→7.0.0-1007.7apt_upgrade
Standard apt upgrade. Install 7.0.0-1007.7 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-tools-azure-7.0
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

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