Ubuntu alert USN-8370-1 (linux, linux-aws, linux-gcp, linux-ibm, linux-nvidia, linux-oracle, linux-raspi, linux-realtime)

From:
             
 
Rodrigo Figueiredo Zaiden via ubuntu-security-announce <ubuntu-security-announce@lists.ubuntu.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-8370-1] Linux kernel vulnerabilities
Date:
             
 
Tue, 02 Jun 2026 11:47:38 -0300
Message-ID:
             
 
<da833575-33d1-4d19-b68b-5f3dda1a435b@canonical.com>
Cc:
             
 
Rodrigo Figueiredo Zaiden <rodrigo.zaiden@canonical.com>
==========================================================================
Ubuntu Security Notice USN-8370-1
June 02, 2026

linux, linux-aws, linux-gcp, linux-ibm, linux-nvidia, linux-oracle,
linux-raspi, linux-realtime vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-ibm: Linux kernel for IBM cloud systems
- linux-nvidia: Linux kernel for NVIDIA 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

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)

A security issue was discovered in the Linux kernel.
An attacker could possibly use this to compromise the system.
This update corrects flaws in the following subsystem:
   - RDS protocol;
(CVE-2026-43494)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
   linux-image-7.0.0-1005-gcp      7.0.0-1005.5
   linux-image-7.0.0-1005-gcp-64k  7.0.0-1005.5
   linux-image-7.0.0-1005-oracle   7.0.0-1005.5
   linux-image-7.0.0-1005-oracle-64k  7.0.0-1005.5
   linux-image-7.0.0-1006-aws      7.0.0-1006.6
   linux-image-7.0.0-1006-aws-64k  7.0.0-1006.6
   linux-image-7.0.0-1007-ibm      7.0.0-1007.7
   linux-image-7.0.0-1009-nvidia   7.0.0-1009.9
   linux-image-7.0.0-1009-nvidia-64k  7.0.0-1009.9
   linux-image-7.0.0-1011-raspi    7.0.0-1011.11
   linux-image-7.0.0-1011-raspi-realtime  7.0.0-1011.11
   linux-image-7.0.0-22-generic    7.0.0-22.22
   linux-image-7.0.0-22-generic-64k  7.0.0-22.22
   linux-image-7.0.0-22-realtime   7.0.0-22.22.1
   linux-image-7.0.0-22-realtime-64k  7.0.0-22.22.1
   linux-image-aws                 7.0.0-1006.6
   linux-image-aws-64k             7.0.0-1006.6
   linux-image-aws-64k-7.0         7.0.0-1006.6
   linux-image-aws-7.0             7.0.0-1006.6
   linux-image-gcp                 7.0.0-1005.5
   linux-image-gcp-64k             7.0.0-1005.5
   linux-image-gcp-64k-7.0         7.0.0-1005.5
   linux-image-gcp-7.0             7.0.0-1005.5
   linux-image-generic             7.0.0-22.22
   linux-image-generic-64k         7.0.0-22.22
   linux-image-generic-64k-7.0     7.0.0-22.22
   linux-image-generic-64k-hwe-26.04  7.0.0-22.22
   linux-image-generic-7.0         7.0.0-22.22
   linux-image-generic-hwe-26.04   7.0.0-22.22
   linux-image-ibm                 7.0.0-1007.7
   linux-image-ibm-7.0             7.0.0-1007.7
   linux-image-nvidia              7.0.0-1009.9
   linux-image-nvidia-64k          7.0.0-1009.9
   linux-image-nvidia-64k-7.0      7.0.0-1009.9
   linux-image-nvidia-7.0          7.0.0-1009.9
   linux-image-oracle              7.0.0-1005.5
   linux-image-oracle-64k          7.0.0-1005.5
   linux-image-oracle-64k-7.0      7.0.0-1005.5
   linux-image-oracle-7.0          7.0.0-1005.5
   linux-image-raspi               7.0.0-1011.11
   linux-image-raspi-7.0           7.0.0-1011.11
   linux-image-raspi-realtime      7.0.0-1011.11
   linux-image-raspi-realtime-7.0  7.0.0-1011.11
   linux-image-realtime            7.0.0-22.22.1
   linux-image-realtime-64k        7.0.0-22.22.1
   linux-image-realtime-64k-7.0    7.0.0-22.22.1
   linux-image-realtime-64k-hwe-26.04  7.0.0-22.22.1
   linux-image-realtime-7.0        7.0.0-22.22.1
   linux-image-realtime-hwe-26.04  7.0.0-22.22.1
   linux-image-virtual             7.0.0-22.22
   linux-image-virtual-7.0         7.0.0-22.22
   linux-image-virtual-hwe-26.04   7.0.0-22.22

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-8370-1
   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/7.0.0-22.22
   https://launchpad.net/ubuntu/+source/linux-aws/7.0.0-1006.6
   https://launchpad.net/ubuntu/+source/linux-gcp/7.0.0-1005.5
   https://launchpad.net/ubuntu/+source/linux-ibm/7.0.0-1007.7
   https://launchpad.net/ubuntu/+source/linux-nvidia/7.0.0-1...
   https://launchpad.net/ubuntu/+source/linux-oracle/7.0.0-1...
   https://launchpad.net/ubuntu/+source/linux-raspi/7.0.0-10...
   https://launchpad.net/ubuntu/+source/linux-realtime/7.0.0...



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