1. Ubuntu Security Notices
  2. USN-8569-1

USN-8569-1: Linux kernel (HWE) vulnerabilities

Publication date

20 July 2026

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)

It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)

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....

It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)

It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)

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:

  • PSP security protocol;
  • ARM64 architecture;
  • PowerPC architecture;
  • RISC-V architecture;
  • S390 architecture;
  • User-Mode Linux (UML);
  • x86 architecture;
  • Block layer subsystem;
  • Cryptographic API;
  • Intel NPU Driver;
  • DRBD Distributed Replicated Block Device drivers;
  • Rados block device (RBD) driver;
  • Ublk userspace block driver;
  • Compressed RAM block device driver;
  • Bluetooth drivers;
  • Bus devices;
  • Character device driver;
  • TPM device driver;
  • Clock framework and drivers;
  • CPU frequency scaling framework;
  • Hardware crypto device drivers;
  • EDAC drivers;
  • EFI core;
  • FWCTL subsystem;
  • GPU drivers;
  • Greybus drivers;
  • HID subsystem;
  • Microsoft Hyper-V drivers;
  • Hardware monitoring drivers;
  • I2C subsystem;
  • I3C subsystem;
  • IIO subsystem;
  • InfiniBand drivers;
  • Input Device core drivers;
  • IOMMU subsystem;
  • LED subsystem;
  • Mailbox framework;
  • Multiple devices driver;
  • Media drivers;
  • NVIDIA Tegra memory controller driver;
  • IBM Advanced System Management driver;
  • MTD block device drivers;
  • Network drivers;
  • Ethernet bonding driver;
  • Mellanox network drivers;
  • Microsoft Azure Network Adapter (MANA) driver;
  • STMicroelectronics network drivers;
  • MediaTek network drivers;
  • NTB driver;
  • NVME drivers;
  • Device tree and open firmware driver;
  • PCI subsystem;
  • Pin controllers subsystem;
  • Chrome hardware platform drivers;
  • ACPI WMI driver;
  • x86 platform drivers;
  • Generic PM domains;
  • MediaTek PM domains;
  • Power supply drivers;
  • Remote Processor subsystem;
  • MPAM driver;
  • Amlogic Meson reset controller drivers;
  • S/390 drivers;
  • SCSI subsystem;
  • NVIDIA Tegra Control Backbone (CBB) driver;
  • SPI subsystem;
  • Greybus lights staging drivers;
  • Media staging drivers;
  • Realtek RTL8723BS SDIO drivers;
  • SM750 framebuffer staging driver;
  • TCM subsystem;
  • Thermal drivers;
  • TTY drivers;
  • USB Device Class drivers;
  • ULPI bus;
  • USB Gadget drivers;
  • USB Type-C support driver;
  • TI TPS6598x USB Power Delivery controller driver;
  • USB over IP driver;
  • vDPA drivers;
  • VFIO drivers;
  • Framebuffer layer;
  • TSM AMD SEV Guest driver;
  • Xen hypervisor drivers;
  • 9P distributed file system;
  • File systems infrastructure;
  • AFS file system;
  • BTRFS file system;
  • Ceph distributed file system;
  • EROFS file system;
  • Ext4 file system;
  • F2FS file system;
  • FUSE (File system in Userspace);
  • GFS2 file system;
  • HFS+ file system;
  • HugeTLB file system;
  • Journaling layer for block devices (JBD2);
  • Network file system (NFS) server daemon;
  • NILFS2 file system;
  • File system notification infrastructure;
  • NTFS3 file system;
  • OCFS2 file system;
  • Overlay file system;
  • Diskquota system;
  • SMB network file system;
  • Tracing file system;
  • UDF file system;
  • XFS file system;
  • DRM TTM subsystem;
  • Codetag library;
  • Control group (cgroup);
  • Kernel CPU control infrastructure;
  • Memory management;
  • QorIQ DPAA2 FSL-MC bus driver;
  • Freescale ENETC Ethernet drivers;
  • Memory Management;
  • KVM subsystem;
  • padata parallel execution mechanism;
  • PPP protocol drivers and compressors;
  • Bluetooth subsystem;
  • Networking core;
  • Netfilter;
  • Network traffic control;
  • Tracing infrastructure;
  • User-space API (UAPI);
  • io_uring subsystem;
  • IPC subsystem;
  • Audit subsystem;
  • BPF subsystem;
  • Kernel exit() syscall;
  • Kernel fork() syscall;
  • Kernel futex primitives;
  • Locking primitives;
  • Padata parallel execution mechanism;
  • Scheduler infrastructure;
  • Timer subsystem;
  • Cryptographic library;
  • Scatterlist API;
  • Heterogeneous memory management;
  • KASAN memory debugging framework;
  • 802.1Q VLAN protocol;
  • B.A.T.M.A.N. meshing protocol;
  • Ethernet bridge;
  • CAIF protocol;
  • CAN network layer;
  • Ceph Core library;
  • Distributed Switch Architecture;
  • IPv4 networking;
  • IPv6 networking;
  • MAC80211 subsystem;
  • Multipath TCP;
  • NFC subsystem;
  • Open vSwitch;
  • Packet sockets;
  • Phonet protocol;
  • Qualcomm IPC Router (QRTR);
  • RDS protocol;
  • RxRPC session sockets;
  • SCTP protocol;
  • SMC sockets;
  • Stream parser;
  • TIPC protocol;
  • TLS protocol;
  • Unix domain sockets;
  • VMware vSockets driver;
  • XFRM subsystem;
  • Integrity Measurement Architecture(IMA) framework;
  • Landlock security;
  • SELinux security module;
  • ALSA framework;
  • Generic PCM loopback sound driver;
  • FireWire sound drivers;
  • HD-audio driver;
  • Creative Sound Blaster X-Fi driver;
  • QCOM ASoC drivers;
  • SOF drivers;
  • STI ASoC drivers;
  • USB sound devices;
  • Objtool

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
24.04 LTS noble linux-image-7.0.0-28-generic –  7.0.0-28.28~24.04.1
linux-image-7.0.0-28-generic-64k –  7.0.0-28.28~24.04.1
linux-image-generic-64k-7.0 –  7.0.0-28.28~24.04.1
linux-image-generic-64k-hwe-24.04 –  7.0.0-28.28~24.04.1
linux-image-generic-7.0 –  7.0.0-28.28~24.04.1
linux-image-generic-hwe-24.04 –  7.0.0-28.28~24.04.1
linux-image-virtual-7.0 –  7.0.0-28.28~24.04.1
linux-image-virtual-hwe-24.04 –  7.0.0-28.28~24.04.1

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References

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