USN-8569-1: Linux kernel (HWE) vulnerabilities | Ubuntu security notices

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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
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