1. Ubuntu Security Notices
  2. USN-8489-1

USN-8489-1: Linux kernel (OEM) vulnerabilities

Publication date

1 July 2026

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

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,

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:

  • ARM64 architecture;
  • x86 architecture;
  • Block layer subsystem;
  • Cryptographic API;
  • Rados block device (RBD) driver;
  • Compressed RAM block device driver;
  • Character device driver;
  • TPM device driver;
  • Hardware crypto device drivers;
  • EDAC drivers;
  • GPU drivers;
  • Greybus drivers;
  • Hardware monitoring drivers;
  • IIO subsystem;
  • InfiniBand drivers;
  • Input Device core drivers;
  • LED subsystem;
  • Multiple devices driver;
  • Media drivers;
  • IBM Advanced System Management driver;
  • MTD block device drivers;
  • Network drivers;
  • Microsoft Azure Network Adapter (MANA) driver;
  • NVME drivers;
  • Device tree and open firmware driver;
  • PCI subsystem;
  • Remote Processor subsystem;
  • SCSI subsystem;
  • SPI subsystem;
  • Thermal drivers;
  • VFIO drivers;
  • Framebuffer layer;
  • 9P distributed file system;
  • AFS file system;
  • Ceph distributed file system;
  • EROFS file system;
  • File systems infrastructure;
  • Ext4 file system;
  • Journaling layer for block devices (JBD2);
  • File system notification infrastructure;
  • NTFS3 file system;
  • OCFS2 file system;
  • Overlay file system;
  • SMB network file system;
  • UDF file system;
  • XFS file system;
  • Codetag library;
  • Memory management;
  • Tracing infrastructure;
  • io_uring subsystem;
  • Locking primitives;
  • Scatterlist API;
  • Heterogeneous memory management;
  • Bluetooth subsystem;
  • Ethernet bridge;
  • CAIF protocol;
  • Ceph Core library;
  • Networking core;
  • IPv4 networking;
  • IPv6 networking;
  • Multipath TCP;
  • Netfilter;
  • Qualcomm IPC Router (QRTR);
  • RDS protocol;
  • RxRPC session sockets;
  • SMC sockets;
  • Stream parser;
  • Landlock security;
  • SELinux security module;
  • ALSA framework;
  • Generic PCM loopback sound driver;
  • Creative Sound Blaster X-Fi driver;
  • USB sound devices

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
26.04 LTS resolute linux-image-7.0.0-1008-oem –  7.0.0-1008.8
linux-image-oem-26.04 –  7.0.0-1008.8
linux-image-oem-26.04a –  7.0.0-1008.8
linux-image-oem-7.0 –  7.0.0-1008.8

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References

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