========================================================================== Ubuntu Security Notice USN-8371-1 June 02, 2026
linux, linux-aws, linux-azure, linux-azure-6.17, linux-hwe-6.17,
linux-nvidia-6.17, linux-oem-6.17, linux-oracle, linux-oracle-6.17,
linux-raspi, linux-realtime, linux-realtime-6.17 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 25.10
- Ubuntu 24.04 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-azure: Linux kernel for Microsoft Azure Cloud 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-azure-6.17: Linux kernel for Microsoft Azure cloud systems
- linux-hwe-6.17: Linux hardware enablement (HWE) kernel
- linux-nvidia-6.17: Linux kernel for NVIDIA systems
- linux-oem-6.17: Linux kernel for OEM systems
- linux-oracle-6.17: Linux kernel for Oracle Cloud systems
- linux-realtime-6.17: 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, 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:
- 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 25.10
linux-image-6.17.0-1014-realtime 6.17.0-1014.16
linux-image-6.17.0-1016-oracle 6.17.0-1016.16
linux-image-6.17.0-1016-oracle-64k 6.17.0-1016.16
linux-image-6.17.0-1017-aws 6.17.0-1017.17
linux-image-6.17.0-1017-aws-64k 6.17.0-1017.17
linux-image-6.17.0-1017-azure 6.17.0-1017.17
linux-image-6.17.0-1018-raspi 6.17.0-1018.18
linux-image-6.17.0-35-generic 6.17.0-35.35
linux-image-6.17.0-35-generic-64k 6.17.0-35.35
linux-image-aws 6.17.0-1017.17
linux-image-aws-6.17 6.17.0-1017.17
linux-image-aws-64k 6.17.0-1017.17
linux-image-aws-64k-6.17 6.17.0-1017.17
linux-image-azure 6.17.0-1017.17
linux-image-azure-6.17 6.17.0-1017.17
linux-image-generic 6.17.0-35.35
linux-image-generic-6.17 6.17.0-35.35
linux-image-generic-64k 6.17.0-35.35
linux-image-generic-64k-6.17 6.17.0-35.35
linux-image-oracle 6.17.0-1016.16
linux-image-oracle-6.17 6.17.0-1016.16
linux-image-oracle-64k 6.17.0-1016.16
linux-image-oracle-64k-6.17 6.17.0-1016.16
linux-image-raspi 6.17.0-1018.18
linux-image-raspi-6.17 6.17.0-1018.18
linux-image-realtime 6.17.0-1014.16
linux-image-realtime-6.17 6.17.0-1014.16
linux-image-virtual 6.17.0-35.35
linux-image-virtual-6.17 6.17.0-35.35
Ubuntu 24.04 LTS
linux-image-6.17.0-1014-realtime 6.17.0-1014.16~24.04.1
Available with Ubuntu Pro
linux-image-6.17.0-1016-oracle 6.17.0-1016.16~24.04.1
linux-image-6.17.0-1016-oracle-64k 6.17.0-1016.16~24.04.1
linux-image-6.17.0-1017-azure 6.17.0-1017.17~24.04.1
linux-image-6.17.0-1021-nvidia 6.17.0-1021.21
linux-image-6.17.0-1021-nvidia-64k 6.17.0-1021.21
linux-image-6.17.0-1024-oem 6.17.0-1024.24
linux-image-6.17.0-35-generic 6.17.0-35.35~24.04.1
linux-image-6.17.0-35-generic-64k 6.17.0-35.35~24.04.1
linux-image-azure 6.17.0-1017.17~24.04.1
linux-image-azure-6.17 6.17.0-1017.17~24.04.1
linux-image-generic-6.17 6.17.0-35.35~24.04.1
linux-image-generic-64k-6.17 6.17.0-35.35~24.04.1
linux-image-generic-64k-hwe-24.04 6.17.0-35.35~24.04.1
linux-image-generic-hwe-24.04 6.17.0-35.35~24.04.1
linux-image-nvidia-6.17 6.17.0-1021.21
linux-image-nvidia-64k-6.17 6.17.0-1021.21
linux-image-nvidia-64k-hwe-24.04 6.17.0-1021.21
linux-image-nvidia-hwe-24.04 6.17.0-1021.21
linux-image-oem-24.04 6.17.0-1024.24
linux-image-oem-24.04a 6.17.0-1024.24
linux-image-oem-24.04b 6.17.0-1024.24
linux-image-oem-24.04c 6.17.0-1024.24
linux-image-oem-24.04d 6.17.0-1024.24
linux-image-oem-6.17 6.17.0-1024.24
linux-image-oracle 6.17.0-1016.16~24.04.1
linux-image-oracle-6.17 6.17.0-1016.16~24.04.1
linux-image-oracle-64k 6.17.0-1016.16~24.04.1
linux-image-oracle-64k-6.17 6.17.0-1016.16~24.04.1
linux-image-realtime-6.17 6.17.0-1014.16~24.04.1
Available with Ubuntu Pro
linux-image-realtime-hwe-24.04 6.17.0-1014.16~24.04.1
Available with Ubuntu Pro
linux-image-virtual-6.17 6.17.0-35.35~24.04.1
linux-image-virtual-hwe-24.04 6.17.0-35.35~24.04.1
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-8371-1
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-2026-47332, CVE-2026-47333,
CVE-2026-47334, CVE-2026-47337
Package Information:
https://launchpad.net/ubuntu/+source/linux/6.17.0-35.35
https://launchpad.net/ubuntu/+source/linux-aws/6.17.0-1017.17
https://launchpad.net/ubuntu/+source/linux-azure/6.17.0-1017.17
https://launchpad.net/ubuntu/+source/linux-oracle/6.17.0-1016.16
https://launchpad.net/ubuntu/+source/linux-raspi/6.17.0-1018.18
https://launchpad.net/ubuntu/+source/linux-realtime/6.17.0-1014.16
https://launchpad.net/ubuntu/+source/linux-azure-6.17/6.17.0-1017.17~24.04.1
https://launchpad.net/ubuntu/+source/linux-hwe-6.17/6.17.0-35.35~24.04.1
https://launchpad.net/ubuntu/+source/linux-nvidia-6.17/6.17.0-1021.21
https://launchpad.net/ubuntu/+source/linux-oem-6.17/6.17.0-1024.24
https://launchpad.net/ubuntu/+source/linux-oracle-6.17/6.17.0-1016.16~24.04.1
https://launchpad.net/ubuntu/+source/linux-realtime-6.17/6.17.0-1014.16~24.04.1
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