Ubuntu USN · USN-8616-1

Linux kernel (IBM) vulnerabilities

Published: Tue, 28 Jul 2026 06:43

CVE-2026-31682CVE-2026-43500CVE-2026-43494CVE-2026-43383CVE-2026-43503CVE-2026-43037CVE-2026-43117CVE-2026-43011CVE-2026-46135CVE-2026-31685CVE-2026-46043CVE-2026-31649CVE-2026-46119CVE-2026-31607CVE-2026-31402CVE-2026-46243CVE-2026-23455CVE-2026-31659CVE-2026-23272CVE-2026-43414CVE-2026-45988CVE-2026-43038CVE-2026-43407CVE-2026-43284CVE-2026-31418CVE-2026-31637

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) 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; - STMicroelectronics network drivers; - NVME drivers; - SCSI subsystem; - 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; - IPv4 networking; - IPv6 networking; - Netfilter; - RDS protocol; - RxRPC session sockets; - X.25 network layer; (CVE-2026-23272, CVE-2026-23455, CVE-2026-31402, CVE-2026-31418, CVE-2026-31607, CVE-2026-31637, CVE-2026-31649, CVE-2026-31659, CVE-2026-31682, CVE-2026-31685, CVE-2026-43011, CVE-2026-43037, CVE-2026-43038, CVE-2026-43117, CVE-2026-43383, CVE-2026-43407, CVE-2026-43414, CVE-2026-43494, CVE-2026-45988, CVE-2026-46043, CVE-2026-46119, CVE-2026-46135, CVE-2026-46243)

Recommended actions per Ubuntu release

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

Ubuntu bionic

linux-ibm-5.4→5.4.0-1107.112~18.04.1apt_upgrade
Standard apt upgrade. Install 5.4.0-1107.112~18.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-ibm-5.4
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-buildinfo-5.4.0-1107-ibm→5.4.0-1107.112~18.04.1apt_upgrade
Standard apt upgrade. Install 5.4.0-1107.112~18.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-buildinfo-5.4.0-1107-ibm
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-headers-5.4.0-1107-ibm→5.4.0-1107.112~18.04.1kernel_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-5.4.0-1107-ibm
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-headers-ibm→5.4.0.1107.112~18.04.1kernel_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-ibm
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-headers-ibm-5.4→5.4.0.1107.112~18.04.1kernel_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-ibm-5.4
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-headers-ibm-edge→5.4.0.1107.112~18.04.1kernel_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-ibm-edge
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-ibm→5.4.0.1107.112~18.04.1apt_upgrade
Standard apt upgrade. Install 5.4.0.1107.112~18.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-ibm
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-ibm-5.4→5.4.0.1107.112~18.04.1apt_upgrade
Standard apt upgrade. Install 5.4.0.1107.112~18.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-ibm-5.4
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-ibm-5.4-cloud-tools-common→5.4.0-1107.112~18.04.1apt_upgrade
Standard apt upgrade. Install 5.4.0-1107.112~18.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-ibm-5.4-cloud-tools-common
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-ibm-5.4-headers-5.4.0-1107→5.4.0-1107.112~18.04.1apt_upgrade
Standard apt upgrade. Install 5.4.0-1107.112~18.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-ibm-5.4-headers-5.4.0-1107
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-ibm-5.4-source-5.4.0→5.4.0-1107.112~18.04.1apt_upgrade
Standard apt upgrade. Install 5.4.0-1107.112~18.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-ibm-5.4-source-5.4.0
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-ibm-5.4-tools-5.4.0-1107→5.4.0-1107.112~18.04.1apt_upgrade
Standard apt upgrade. Install 5.4.0-1107.112~18.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-ibm-5.4-tools-5.4.0-1107
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-ibm-5.4-tools-common→5.4.0-1107.112~18.04.1apt_upgrade
Standard apt upgrade. Install 5.4.0-1107.112~18.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-ibm-5.4-tools-common
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-ibm-edge→5.4.0.1107.112~18.04.1apt_upgrade
Standard apt upgrade. Install 5.4.0.1107.112~18.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-ibm-edge
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-image-5.4.0-1107-ibm→5.4.0-1107.112~18.04.1kernel_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-5.4.0-1107-ibm
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-ibm→5.4.0.1107.112~18.04.1kernel_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-ibm
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-ibm-5.4→5.4.0.1107.112~18.04.1kernel_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-ibm-5.4
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-ibm-edge→5.4.0.1107.112~18.04.1kernel_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-ibm-edge
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-unsigned-5.4.0-1107-ibm→5.4.0-1107.112~18.04.1kernel_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-5.4.0-1107-ibm
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-modules-5.4.0-1107-ibm→5.4.0-1107.112~18.04.1kernel_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-5.4.0-1107-ibm
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-modules-extra-5.4.0-1107-ibm→5.4.0-1107.112~18.04.1kernel_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-5.4.0-1107-ibm
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-modules-extra-ibm→5.4.0.1107.112~18.04.1kernel_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-ibm
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-modules-extra-ibm-5.4→5.4.0.1107.112~18.04.1kernel_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-ibm-5.4
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-modules-extra-ibm-edge→5.4.0.1107.112~18.04.1kernel_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-ibm-edge
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-tools-5.4.0-1107-ibm→5.4.0-1107.112~18.04.1apt_upgrade
Standard apt upgrade. Install 5.4.0-1107.112~18.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-tools-5.4.0-1107-ibm
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-tools-ibm→5.4.0.1107.112~18.04.1apt_upgrade
Standard apt upgrade. Install 5.4.0.1107.112~18.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-tools-ibm
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-tools-ibm-5.4→5.4.0.1107.112~18.04.1apt_upgrade
Standard apt upgrade. Install 5.4.0.1107.112~18.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-tools-ibm-5.4
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-tools-ibm-edge→5.4.0.1107.112~18.04.1apt_upgrade
Standard apt upgrade. Install 5.4.0.1107.112~18.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-tools-ibm-edge
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu focal

linux-ibm→5.4.0-1107.112apt_upgrade
Standard apt upgrade. Install 5.4.0-1107.112 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-ibm
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-buildinfo-5.4.0-1107-ibm→5.4.0-1107.112apt_upgrade
Standard apt upgrade. Install 5.4.0-1107.112 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-buildinfo-5.4.0-1107-ibm
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-headers-5.4.0-1107-ibm→5.4.0-1107.112kernel_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-5.4.0-1107-ibm
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-headers-ibm-5.4→5.4.0.1107.136kernel_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-ibm-5.4
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-headers-ibm-lts-20.04→5.4.0.1107.136kernel_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-ibm-lts-20.04
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-ibm-5.4→5.4.0.1107.136apt_upgrade
Standard apt upgrade. Install 5.4.0.1107.136 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-ibm-5.4
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-ibm-cloud-tools-common→5.4.0-1107.112apt_upgrade
Standard apt upgrade. Install 5.4.0-1107.112 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-ibm-cloud-tools-common
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-ibm-headers-5.4.0-1107→5.4.0-1107.112apt_upgrade
Standard apt upgrade. Install 5.4.0-1107.112 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-ibm-headers-5.4.0-1107
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-ibm-lts-20.04→5.4.0.1107.136apt_upgrade
Standard apt upgrade. Install 5.4.0.1107.136 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-ibm-lts-20.04
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-ibm-source-5.4.0→5.4.0-1107.112apt_upgrade
Standard apt upgrade. Install 5.4.0-1107.112 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-ibm-source-5.4.0
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-ibm-tools-5.4.0-1107→5.4.0-1107.112apt_upgrade
Standard apt upgrade. Install 5.4.0-1107.112 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-ibm-tools-5.4.0-1107
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-ibm-tools-common→5.4.0-1107.112apt_upgrade
Standard apt upgrade. Install 5.4.0-1107.112 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-ibm-tools-common
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-image-5.4.0-1107-ibm→5.4.0-1107.112kernel_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-5.4.0-1107-ibm
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-ibm-5.4→5.4.0.1107.136kernel_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-ibm-5.4
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-ibm-lts-20.04→5.4.0.1107.136kernel_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-ibm-lts-20.04
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-image-unsigned-5.4.0-1107-ibm→5.4.0-1107.112kernel_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-5.4.0-1107-ibm
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-modules-5.4.0-1107-ibm→5.4.0-1107.112kernel_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-5.4.0-1107-ibm
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-modules-extra-5.4.0-1107-ibm→5.4.0-1107.112kernel_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-5.4.0-1107-ibm
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-modules-extra-ibm-5.4→5.4.0.1107.136kernel_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-ibm-5.4
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-modules-extra-ibm-lts-20.04→5.4.0.1107.136kernel_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-ibm-lts-20.04
sudo reboot
```
Reboot is required. ~30-60s downtime; containers self-restart.
linux-tools-5.4.0-1107-ibm→5.4.0-1107.112apt_upgrade
Standard apt upgrade. Install 5.4.0-1107.112 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-tools-5.4.0-1107-ibm
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-tools-ibm-5.4→5.4.0.1107.136apt_upgrade
Standard apt upgrade. Install 5.4.0.1107.136 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-tools-ibm-5.4
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
linux-tools-ibm-lts-20.04→5.4.0.1107.136apt_upgrade
Standard apt upgrade. Install 5.4.0.1107.136 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y linux-tools-ibm-lts-20.04
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Are YOU affected by USN-8616-1?

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-8616-1 (and any other live CVE) applies. Anonymous, no signup.

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

Form-based quickscan Read the bash source first

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