========================================================================== Ubuntu Security Notice USN-8373-1 June 02, 2026
linux, linux-aws, linux-aws-6.8, linux-aws-fips, linux-azure, linux-fips, linux-gcp, linux-gcp-6.8, linux-gcp-fips, linux-gke, linux-gkeop, linux-hwe-6.8, linux-ibm, linux-ibm-6.8, linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency, linux-nvidia-tegra, linux-oracle, linux-oracle-6.8, linux-raspi, linux-raspi-realtime, linux-realtime, linux-realtime-6.8 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 24.04 LTS - Ubuntu 22.04 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-azure: Linux kernel for Microsoft Azure Cloud systems - 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-nvidia: Linux kernel for NVIDIA systems
- linux-nvidia-lowlatency: Linux low latency kernel for NVIDIA systems
- linux-nvidia-tegra: Linux kernel for NVIDIA Tegra systems
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi: Linux kernel for Raspberry Pi systems
- linux-raspi-realtime: Linux kernel for Raspberry Pi Real-time systems
- linux-realtime: Linux kernel for Real-time systems
- linux-aws-6.8: Linux kernel for Amazon Web Services (AWS) systems
- linux-gcp-6.8: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe-6.8: Linux hardware enablement (HWE) kernel
- linux-ibm-6.8: Linux kernel for IBM cloud systems
- linux-nvidia-6.8: Linux kernel for NVIDIA systems
- linux-oracle-6.8: Linux kernel for Oracle Cloud systems
- linux-realtime-6.8: Linux kernel for Real-time 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, 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 contained a use-
after-free (UAF) bug. A local attacker could use this to cause memory
corruption and, theoretically, arbitrary code execution. (CVE-2026-47331)
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 discovered that Ubuntu Linux kernel 6.8 contained a NULL
pointer dereference when handling AppArmor notifications. A local attacker
could use this to cause a kernel panic. (CVE-2026-47335)
Tristan Madani discovered that Ubuntu Linux kernel 6.8 used an
uninitialized variable when handling AppArmor AF_INET/AF_INET6 socket
mediation. A local attacker could use this to influence processing of fine-
grained network socket mediation. (CVE-2026-47336)
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:
- RDS protocol;
- RxRPC session sockets;
(CVE-2026-31676, CVE-2026-43494)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 24.04 LTS
linux-image-6.8.0-1026-nvidia-tegra 6.8.0-1026.26
linux-image-6.8.0-1026-nvidia-tegra-rt 6.8.0-1026.26
linux-image-6.8.0-1042-gkeop 6.8.0-1042.45
linux-image-6.8.0-1054-oracle 6.8.0-1054.55
linux-image-6.8.0-1054-oracle-64k 6.8.0-1054.55
linux-image-6.8.0-1055-gke 6.8.0-1055.61
linux-image-6.8.0-1055-gke-64k 6.8.0-1055.61
linux-image-6.8.0-1055-nvidia 6.8.0-1055.58
linux-image-6.8.0-1055-nvidia-64k 6.8.0-1055.58
linux-image-6.8.0-1055-nvidia-lowlatency 6.8.0-1055.58.1
linux-image-6.8.0-1055-nvidia-lowlatency-64k 6.8.0-1055.58.1
linux-image-6.8.0-1057-aws 6.8.0-1057.60
linux-image-6.8.0-1057-aws-64k 6.8.0-1057.60
linux-image-6.8.0-1057-aws-fips 6.8.0-1057.60+fips1
Available with Ubuntu Pro
linux-image-6.8.0-1057-ibm 6.8.0-1057.58
linux-image-6.8.0-1057-raspi 6.8.0-1057.61
linux-image-6.8.0-1058-azure 6.8.0-1058.64
linux-image-6.8.0-1060-gcp 6.8.0-1060.63
linux-image-6.8.0-1060-gcp-64k 6.8.0-1060.63
linux-image-6.8.0-1060-gcp-fips 6.8.0-1060.63+fips1
Available with Ubuntu Pro
linux-image-6.8.0-124-fips 6.8.0-124.124+fips1
Available with Ubuntu Pro
linux-image-6.8.0-124-generic 6.8.0-124.124
linux-image-6.8.0-124-generic-64k 6.8.0-124.124
linux-image-6.8.0-2046-raspi-realtime 6.8.0-2046.47
Available with Ubuntu Pro
linux-image-6.8.1-1052-realtime 6.8.1-1052.53
Available with Ubuntu Pro
linux-image-aws-6.8 6.8.0-1057.60
linux-image-aws-64k-6.8 6.8.0-1057.60
linux-image-aws-64k-lts-24.04 6.8.0-1057.60
linux-image-aws-fips 6.8.0-1057.60+fips1
Available with Ubuntu Pro
linux-image-aws-fips-6.8 6.8.0-1057.60+fips1
Available with Ubuntu Pro
linux-image-aws-lts-24.04 6.8.0-1057.60
linux-image-azure-6.8 6.8.0-1058.64
linux-image-azure-lts-24.04 6.8.0-1058.64
linux-image-fips 6.8.0-124.124+fips1
Available with Ubuntu Pro
linux-image-fips-6.8 6.8.0-124.124+fips1
Available with Ubuntu Pro
linux-image-gcp-6.8 6.8.0-1060.63
linux-image-gcp-64k-6.8 6.8.0-1060.63
linux-image-gcp-64k-lts-24.04 6.8.0-1060.63
linux-image-gcp-fips 6.8.0-1060.63+fips1
Available with Ubuntu Pro
linux-image-gcp-fips-6.8 6.8.0-1060.63+fips1
Available with Ubuntu Pro
linux-image-gcp-lts-24.04 6.8.0-1060.63
linux-image-generic 6.8.0-124.124
linux-image-generic-6.8 6.8.0-124.124
linux-image-generic-64k 6.8.0-124.124
linux-image-generic-64k-6.8 6.8.0-124.124
linux-image-generic-lpae 6.8.0-124.124
linux-image-gke 6.8.0-1055.61
linux-image-gke-6.8 6.8.0-1055.61
linux-image-gke-64k 6.8.0-1055.61
linux-image-gke-64k-6.8 6.8.0-1055.61
linux-image-gkeop 6.8.0-1042.45
linux-image-gkeop-6.8 6.8.0-1042.45
linux-image-ibm 6.8.0-1057.58
linux-image-ibm-6.8 6.8.0-1057.58
linux-image-ibm-classic 6.8.0-1057.58
linux-image-ibm-lts-24.04 6.8.0-1057.58
linux-image-intel-iot-realtime 6.8.1-1052.53
Available with Ubuntu Pro
linux-image-intel-iotg 6.8.0-124.124
linux-image-kvm 6.8.0-124.124
linux-image-nvidia 6.8.0-1055.58
linux-image-nvidia-6.8 6.8.0-1055.58
linux-image-nvidia-64k 6.8.0-1055.58
linux-image-nvidia-64k-6.8 6.8.0-1055.58
linux-image-nvidia-lowlatency 6.8.0-1055.58.1
linux-image-nvidia-lowlatency-6.8 6.8.0-1055.58.1
linux-image-nvidia-lowlatency-64k 6.8.0-1055.58.1
linux-image-nvidia-lowlatency-64k-6.8 6.8.0-1055.58.1
linux-image-nvidia-tegra 6.8.0-1026.26
linux-image-nvidia-tegra-6.8 6.8.0-1026.26
linux-image-nvidia-tegra-rt 6.8.0-1026.26
linux-image-nvidia-tegra-rt-6.8 6.8.0-1026.26
linux-image-oracle-6.8 6.8.0-1054.55
linux-image-oracle-64k-6.8 6.8.0-1054.55
linux-image-oracle-64k-lts-24.04 6.8.0-1054.55
linux-image-oracle-lts-24.04 6.8.0-1054.55
linux-image-raspi 6.8.0-1057.61
linux-image-raspi-6.8 6.8.0-1057.61
linux-image-raspi-realtime 6.8.0-2046.47
Available with Ubuntu Pro
linux-image-raspi-realtime-6.8 6.8.0-2046.47
Available with Ubuntu Pro
linux-image-realtime 6.8.1-1052.53
Available with Ubuntu Pro
linux-image-realtime-6.8.1 6.8.1-1052.53
Available with Ubuntu Pro
linux-image-virtual 6.8.0-124.124
linux-image-virtual-6.8 6.8.0-124.124
Ubuntu 22.04 LTS
linux-image-6.8.0-1054-oracle 6.8.0-1054.55~22.04.1
linux-image-6.8.0-1054-oracle-64k 6.8.0-1054.55~22.04.1
linux-image-6.8.0-1055-nvidia 6.8.0-1055.58~22.04.1
linux-image-6.8.0-1055-nvidia-64k 6.8.0-1055.58~22.04.1
linux-image-6.8.0-1057-aws 6.8.0-1057.60~22.04.1
linux-image-6.8.0-1057-aws-64k 6.8.0-1057.60~22.04.1
linux-image-6.8.0-1057-ibm 6.8.0-1057.58~22.04.1
linux-image-6.8.0-1060-gcp 6.8.0-1060.63~22.04.1
linux-image-6.8.0-1060-gcp-64k 6.8.0-1060.63~22.04.1
linux-image-6.8.0-124-generic 6.8.0-124.124~22.04.1
linux-image-6.8.0-124-generic-64k 6.8.0-124.124~22.04.1
linux-image-6.8.1-1052-realtime 6.8.1-1052.53~22.04.1
Available with Ubuntu Pro
linux-image-aws 6.8.0-1057.60~22.04.1
linux-image-aws-6.8 6.8.0-1057.60~22.04.1
linux-image-aws-64k 6.8.0-1057.60~22.04.1
linux-image-aws-64k-6.8 6.8.0-1057.60~22.04.1
linux-image-gcp 6.8.0-1060.63~22.04.1
linux-image-gcp-6.8 6.8.0-1060.63~22.04.1
linux-image-gcp-64k 6.8.0-1060.63~22.04.1
linux-image-gcp-64k-6.8 6.8.0-1060.63~22.04.1
linux-image-generic-6.8 6.8.0-124.124~22.04.1
linux-image-generic-64k-6.8 6.8.0-124.124~22.04.1
linux-image-generic-64k-hwe-22.04 6.8.0-124.124~22.04.1
linux-image-generic-hwe-22.04 6.8.0-124.124~22.04.1
linux-image-ibm-6.8 6.8.0-1057.58~22.04.1
linux-image-nvidia-6.8 6.8.0-1055.58~22.04.1
linux-image-nvidia-64k-6.8 6.8.0-1055.58~22.04.1
linux-image-nvidia-64k-hwe-22.04 6.8.0-1055.58~22.04.1
linux-image-nvidia-hwe-22.04 6.8.0-1055.58~22.04.1
linux-image-oem-22.04 6.8.0-124.124~22.04.1
linux-image-oem-22.04a 6.8.0-124.124~22.04.1
linux-image-oem-22.04b 6.8.0-124.124~22.04.1
linux-image-oem-22.04c 6.8.0-124.124~22.04.1
linux-image-oem-22.04d 6.8.0-124.124~22.04.1
linux-image-oracle 6.8.0-1054.55~22.04.1
linux-image-oracle-6.8 6.8.0-1054.55~22.04.1
linux-image-oracle-64k 6.8.0-1054.55~22.04.1
linux-image-oracle-64k-6.8 6.8.0-1054.55~22.04.1
linux-image-realtime-6.8.1 6.8.1-1052.53~22.04.1
Available with Ubuntu Pro
linux-image-realtime-hwe-22.04 6.8.1-1052.53~22.04.1
Available with Ubuntu Pro
linux-image-virtual-6.8 6.8.0-124.124~22.04.1
linux-image-virtual-hwe-22.04 6.8.0-124.124~22.04.1
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-8373-1
CVE-2026-31676, CVE-2026-43284, CVE-2026-43494, CVE-2026-43500,
CVE-2026-43503, CVE-2026-45998, CVE-2026-46000, CVE-2026-46300,
CVE-2026-46333, CVE-2026-47326, CVE-2026-47327, CVE-2026-47328,
CVE-2026-47329, CVE-2026-47330, CVE-2026-47331, CVE-2026-47332,
CVE-2026-47333, CVE-2026-47334, CVE-2026-47335, CVE-2026-47336,
CVE-2026-47337
Package Information:
https://launchpad.net/ubuntu/+source/linux/6.8.0-124.124
https://launchpad.net/ubuntu/+source/linux-aws/6.8.0-1057.60
https://launchpad.net/ubuntu/+source/linux-aws-fips/6.8.0-1057.60+fips1
https://launchpad.net/ubuntu/+source/linux-azure/6.8.0-1058.64
https://launchpad.net/ubuntu/+source/linux-fips/6.8.0-124.124+fips1
https://launchpad.net/ubuntu/+source/linux-gcp/6.8.0-1060.63
https://launchpad.net/ubuntu/+source/linux-gcp-fips/6.8.0-1060.63+fips1
https://launchpad.net/ubuntu/+source/linux-gke/6.8.0-1055.61
https://launchpad.net/ubuntu/+source/linux-gkeop/6.8.0-1042.45
https://launchpad.net/ubuntu/+source/linux-ibm/6.8.0-1057.58
https://launchpad.net/ubuntu/+source/linux-nvidia/6.8.0-1055.58
https://launchpad.net/ubuntu/+source/linux-nvidia-lowlatency/6.8.0-1055.58.1
https://launchpad.net/ubuntu/+source/linux-nvidia-tegra/6.8.0-1026.26
https://launchpad.net/ubuntu/+source/linux-oracle/6.8.0-1054.55
https://launchpad.net/ubuntu/+source/linux-raspi/6.8.0-1057.61
https://launchpad.net/ubuntu/+source/linux-raspi-realtime/6.8.0-2046.47
https://launchpad.net/ubuntu/+source/linux-realtime/6.8.1-1052.53
https://launchpad.net/ubuntu/+source/linux-aws-6.8/6.8.0-1057.60~22.04.1
https://launchpad.net/ubuntu/+source/linux-gcp-6.8/6.8.0-1060.63~22.04.1
https://launchpad.net/ubuntu/+source/linux-hwe-6.8/6.8.0-124.124~22.04.1
https://launchpad.net/ubuntu/+source/linux-ibm-6.8/6.8.0-1057.58~22.04.1
https://launchpad.net/ubuntu/+source/linux-nvidia-6.8/6.8.0-1055.58~22.04.1
https://launchpad.net/ubuntu/+source/linux-oracle-6.8/6.8.0-1054.55~22.04.1
https://launchpad.net/ubuntu/+source/linux-realtime-6.8/6.8.1-1052.53~22.04.1
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