========================================================================== Ubuntu Security Notice USN-8388-1 June 04, 2026
linux, linux-aws, linux-aws-5.15, linux-aws-fips, linux-fips, linux-gcp, linux-gcp-5.15, linux-gcp-fips, linux-gke, linux-gkeop, linux-hwe-5.15, linux-ibm, linux-ibm-5.15, linux-intel-iot-realtime, linux-intel-iotg, linux-kvm, linux-nvidia, linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-nvidia-tegra-igx, linux-oracle, linux-raspi, linux-realtime vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 22.04 LTS - Ubuntu 20.04 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-fips: Linux kernel with FIPS - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems- linux-gcp-fips: Linux kernel for Google Cloud Platform (GCP) systems with FIPS
- linux-gke: Linux kernel for Google Container Engine (GKE) systems
- linux-gkeop: Linux kernel for Google Container Engine (GKE) systems
- linux-ibm: Linux kernel for IBM cloud systems
- linux-intel-iot-realtime: Linux kernel for Intel IoT Real-time platforms
- linux-intel-iotg: Linux kernel for Intel IoT platforms
- linux-kvm: Linux kernel for cloud environments
- linux-nvidia: Linux kernel for NVIDIA systems
- linux-nvidia-tegra: Linux kernel for NVIDIA Tegra systems
- linux-nvidia-tegra-igx: Linux kernel for NVIDIA Tegra IGX systems
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi: Linux kernel for Raspberry Pi systems
- linux-realtime: Linux kernel for Real-time systems
- linux-aws-5.15: Linux kernel for Amazon Web Services (AWS) systems
- linux-gcp-5.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe-5.15: Linux hardware enablement (HWE) kernel
- linux-ibm-5.15: Linux kernel for IBM cloud systems
- linux-nvidia-tegra-5.15: Linux kernel for NVIDIA Tegra systems
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,
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)
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:
- RDS protocol;
(CVE-2026-43494)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 22.04 LTS
linux-image-5.15.0-1050-nvidia-tegra-igx 5.15.0-1050.50
linux-image-5.15.0-1050-nvidia-tegra-igx-rt 5.15.0-1050.50
linux-image-5.15.0-1061-nvidia-tegra 5.15.0-1061.61
linux-image-5.15.0-1061-nvidia-tegra-rt 5.15.0-1061.61
linux-image-5.15.0-1092-gkeop 5.15.0-1092.100
linux-image-5.15.0-1101-intel-iot-realtime 5.15.0-1101.103
Available with Ubuntu Pro
linux-image-5.15.0-1101-kvm 5.15.0-1101.106
linux-image-5.15.0-1103-ibm 5.15.0-1103.106
linux-image-5.15.0-1103-raspi 5.15.0-1103.106
linux-image-5.15.0-1104-intel-iotg 5.15.0-1104.110
linux-image-5.15.0-1104-nvidia 5.15.0-1104.105
linux-image-5.15.0-1104-nvidia-lowlatency 5.15.0-1104.105
linux-image-5.15.0-1105-gke 5.15.0-1105.111
linux-image-5.15.0-1106-oracle 5.15.0-1106.112
linux-image-5.15.0-1108-realtime 5.15.0-1108.117
Available with Ubuntu Pro
linux-image-5.15.0-1109-aws 5.15.0-1109.116
linux-image-5.15.0-1109-aws-64k 5.15.0-1109.116
linux-image-5.15.0-1109-aws-fips 5.15.0-1109.116+fips1
Available with Ubuntu Pro
linux-image-5.15.0-1109-gcp 5.15.0-1109.118
linux-image-5.15.0-1109-gcp-fips 5.15.0-1109.118+fips1
Available with Ubuntu Pro
linux-image-5.15.0-181-fips 5.15.0-181.191+fips1
Available with Ubuntu Pro
linux-image-5.15.0-181-generic 5.15.0-181.191
linux-image-5.15.0-181-generic-64k 5.15.0-181.191
linux-image-5.15.0-181-generic-lpae 5.15.0-181.191
linux-image-aws-5.15 5.15.0.1109.112
linux-image-aws-64k-5.15 5.15.0.1109.112
linux-image-aws-64k-lts-22.04 5.15.0.1109.112
linux-image-aws-fips 5.15.0.1109.105
Available with Ubuntu Pro
linux-image-aws-fips-5.15 5.15.0.1109.105
Available with Ubuntu Pro
linux-image-aws-lts-22.04 5.15.0.1109.112
linux-image-fips 5.15.0.181.106
Available with Ubuntu Pro
linux-image-fips-5.15 5.15.0.181.106
Available with Ubuntu Pro
linux-image-gcp-5.15 5.15.0.1109.105
linux-image-gcp-fips 5.15.0.1109.99
Available with Ubuntu Pro
linux-image-gcp-fips-5.15 5.15.0.1109.99
Available with Ubuntu Pro
linux-image-gcp-lts-22.04 5.15.0.1109.105
linux-image-generic 5.15.0.181.164
linux-image-generic-5.15 5.15.0.181.164
linux-image-generic-64k 5.15.0.181.164
linux-image-generic-64k-5.15 5.15.0.181.164
linux-image-generic-lpae 5.15.0.181.164
linux-image-generic-lpae-5.15 5.15.0.181.164
linux-image-gke 5.15.0.1105.104
linux-image-gke-5.15 5.15.0.1105.104
linux-image-gkeop 5.15.0.1092.91
linux-image-gkeop-5.15 5.15.0.1092.91
linux-image-ibm 5.15.0.1103.99
linux-image-ibm-5.15 5.15.0.1103.99
linux-image-intel-iot-realtime 5.15.0.1101.105
Available with Ubuntu Pro
linux-image-intel-iot-realtime-5.15 5.15.0.1101.105
Available with Ubuntu Pro
linux-image-intel-iotg 5.15.0.1104.103
linux-image-intel-iotg-5.15 5.15.0.1104.103
linux-image-kvm 5.15.0.1101.97
linux-image-kvm-5.15 5.15.0.1101.97
linux-image-nvidia 5.15.0.1104.104
linux-image-nvidia-5.15 5.15.0.1104.104
linux-image-nvidia-lowlatency 5.15.0.1104.104
linux-image-nvidia-lowlatency-5.15 5.15.0.1104.104
linux-image-nvidia-tegra 5.15.0.1061.61
linux-image-nvidia-tegra-5.15 5.15.0.1061.61
linux-image-nvidia-tegra-igx 5.15.0.1050.52
linux-image-nvidia-tegra-igx-5.15 5.15.0.1050.52
linux-image-nvidia-tegra-igx-rt 5.15.0.1050.52
linux-image-nvidia-tegra-igx-rt-5.15 5.15.0.1050.52
linux-image-nvidia-tegra-rt 5.15.0.1061.61
linux-image-nvidia-tegra-rt-5.15 5.15.0.1061.61
linux-image-oem-20.04 5.15.0.181.164
linux-image-oracle-5.15 5.15.0.1106.102
linux-image-oracle-lts-22.04 5.15.0.1106.102
linux-image-raspi 5.15.0.1103.101
linux-image-raspi-5.15 5.15.0.1103.101
linux-image-raspi-nolpae 5.15.0.1103.101
linux-image-realtime 5.15.0.1108.112
Available with Ubuntu Pro
linux-image-realtime-5.15 5.15.0.1108.112
Available with Ubuntu Pro
linux-image-virtual 5.15.0.181.164
linux-image-virtual-5.15 5.15.0.181.164
Ubuntu 20.04 LTS
linux-image-5.15.0-1061-nvidia-tegra 5.15.0-1061.61~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-1061-nvidia-tegra-rt 5.15.0-1061.61~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-1103-ibm 5.15.0-1103.106~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-1109-aws 5.15.0-1109.116~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-1109-gcp 5.15.0-1109.118~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-181-generic 5.15.0-181.191~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-181-generic-64k 5.15.0-181.191~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-181-generic-lpae 5.15.0-181.191~20.04.1
Available with Ubuntu Pro
linux-image-aws 5.15.0.1109.116~20.04.1
Available with Ubuntu Pro
linux-image-aws-5.15 5.15.0.1109.116~20.04.1
Available with Ubuntu Pro
linux-image-gcp 5.15.0.1109.118~20.04.1
Available with Ubuntu Pro
linux-image-gcp-5.15 5.15.0.1109.118~20.04.1
Available with Ubuntu Pro
linux-image-generic-5.15 5.15.0.181.191~20.04.1
Available with Ubuntu Pro
linux-image-generic-64k-5.15 5.15.0.181.191~20.04.1
Available with Ubuntu Pro
linux-image-generic-64k-hwe-20.04 5.15.0.181.191~20.04.1
Available with Ubuntu Pro
linux-image-generic-hwe-20.04 5.15.0.181.191~20.04.1
Available with Ubuntu Pro
linux-image-generic-lpae-5.15 5.15.0.181.191~20.04.1
Available with Ubuntu Pro
linux-image-generic-lpae-hwe-20.04 5.15.0.181.191~20.04.1
Available with Ubuntu Pro
linux-image-ibm 5.15.0.1103.106~20.04.1
Available with Ubuntu Pro
linux-image-ibm-5.15 5.15.0.1103.106~20.04.1
Available with Ubuntu Pro
linux-image-nvidia-tegra 5.15.0.1061.61~20.04.1
Available with Ubuntu Pro
linux-image-nvidia-tegra-5.15 5.15.0.1061.61~20.04.1
Available with Ubuntu Pro
linux-image-nvidia-tegra-rt 5.15.0.1061.61~20.04.1
Available with Ubuntu Pro
linux-image-nvidia-tegra-rt-5.15 5.15.0.1061.61~20.04.1
Available with Ubuntu Pro
linux-image-oem-20.04 5.15.0.181.191~20.04.1
Available with Ubuntu Pro
linux-image-oem-20.04b 5.15.0.181.191~20.04.1
Available with Ubuntu Pro
linux-image-oem-20.04c 5.15.0.181.191~20.04.1
Available with Ubuntu Pro
linux-image-oem-20.04d 5.15.0.181.191~20.04.1
Available with Ubuntu Pro
linux-image-virtual-5.15 5.15.0.181.191~20.04.1
Available with Ubuntu Pro
linux-image-virtual-hwe-20.04 5.15.0.181.191~20.04.1
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-8388-1
CVE-2026-43284, CVE-2026-43494, CVE-2026-43500, CVE-2026-43503,
CVE-2026-46300, CVE-2026-46333
Package Information:
https://launchpad.net/ubuntu/+source/linux/5.15.0-181.191
https://launchpad.net/ubuntu/+source/linux-aws/5.15.0-1109.116
https://launchpad.net/ubuntu/+source/linux-aws-fips/5.15.0-1109.116+fips1
https://launchpad.net/ubuntu/+source/linux-fips/5.15.0-181.191+fips1
https://launchpad.net/ubuntu/+source/linux-gcp/5.15.0-1109.118
https://launchpad.net/ubuntu/+source/linux-gcp-fips/5.15.0-1109.118+fips1
https://launchpad.net/ubuntu/+source/linux-gke/5.15.0-1105.111
https://launchpad.net/ubuntu/+source/linux-gkeop/5.15.0-1092.100
https://launchpad.net/ubuntu/+source/linux-ibm/5.15.0-1103.106
https://launchpad.net/ubuntu/+source/linux-intel-iot-realtime/5.15.0-1101.103
https://launchpad.net/ubuntu/+source/linux-intel-iotg/5.15.0-1104.110 https://launchpad.net/ubuntu/+source/linux-kvm/5.15.0-1101.106 https://launchpad.net/ubuntu/+source/linux-nvidia/5.15.0-1104.105 https://launchpad.net/ubuntu/+source/linux-nvidia-tegra/5.15.0-1061.61 https://launchpad.net/ubuntu/+source/linux-nvidia-tegra-igx/5.15.0-1050.50 https://launchpad.net/ubuntu/+source/linux-oracle/5.15.0-1106.112 https://launchpad.net/ubuntu/+source/linux-raspi/5.15.0-1103.106 https://launchpad.net/ubuntu/+source/linux-realtime/5.15.0-1108.117
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