1. Ubuntu Security Notices
  2. USN-8609-1

USN-8609-1: Linux kernel (Azure CVM) vulnerabilities

Publication date

24 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 some AMD Zen 5 processors supporting RDSEED
instruction did not properly handle entropy, potentially resulting in the
consumption of insufficiently random values. A local attacker could
possibly use this issue to influence the values returned by the RDSEED
instruction causing loss of confidentiality and integrity. (

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 some AMD Zen 5 processors supporting RDSEED
instruction did not properly handle entropy, potentially resulting in the
consumption of insufficiently random values. A local attacker could
possibly use this issue to influence the values returned by the RDSEED
instruction causing loss of confidentiality and integrity. (CVE-2025-62626)

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;
  • MIPS architecture;
  • PowerPC architecture;
  • RISC-V architecture;
  • S390 architecture;
  • x86 architecture;
  • Block layer subsystem;
  • Cryptographic API;
  • Compute Acceleration Framework;
  • ACPI drivers;
  • Serial ATA and Parallel ATA drivers;
  • ATM drivers;
  • Drivers core;
  • Power management core;
  • DRBD Distributed Replicated Block Device drivers;
  • Rados block device (RBD) driver;
  • RNBD block device driver;
  • Ublk userspace block driver;
  • Compressed RAM block device driver;
  • Bluetooth drivers;
  • Bus devices;
  • Character device driver;
  • TPM device driver;
  • Clock framework and drivers;
  • Clocksource drivers;
  • Data acquisition framework and drivers;
  • Counter interface drivers;
  • CPU frequency scaling framework;
  • CPU idle management framework;
  • Hardware crypto device drivers;
  • CXL (Compute Express Link) drivers;
  • DMA engine subsystem;
  • EDAC drivers;
  • EFI core;
  • GPIO subsystem;
  • GPU drivers;
  • Greybus drivers;
  • HID subsystem;
  • Hardware monitoring drivers;
  • I2C subsystem;
  • IIO subsystem;
  • IIO ADC drivers;
  • InfiniBand drivers;
  • Input Device (Miscellaneous) drivers;
  • IOMMU subsystem;
  • IRQ chip drivers;
  • LED subsystem;
  • Mailbox framework;
  • Multiple devices driver;
  • Media drivers;
  • MediaTek SMI driver;
  • NVIDIA Tegra memory controller driver;
  • Multifunction device drivers;
  • Broadcom VK accelerator driver;
  • Fastrpc Driver;
  • IBM Advanced System Management driver;
  • MMC subsystem;
  • MOST (Media Oriented Systems Transport) drivers;
  • MTD block device drivers;
  • Network drivers;
  • Ethernet bonding driver;
  • Mellanox network drivers;
  • Microsoft Azure Network Adapter (MANA) driver;
  • STMicroelectronics network drivers;
  • Ethernet team driver;
  • MediaTek network drivers;
  • Near Field Communication (NFC) drivers;
  • NTB driver;
  • NVDIMM (Non-Volatile Memory Device) drivers;
  • NVME drivers;
  • Device tree and open firmware driver;
  • PCI subsystem;
  • Performance monitor drivers;
  • Pin controllers subsystem;
  • x86 platform drivers;
  • Broadcom BCM2835 power domain driver;
  • Generic PM domains;
  • i.MX PM domains;
  • Power supply drivers;
  • RapidIO drivers;
  • RAS (Reliability, Availability, Serviceability) subsystem;
  • Remote Processor subsystem;
  • RPMSG subsystem;
  • S/390 drivers;
  • SCSI subsystem;
  • SLIMbus drivers;
  • Freescale SoC drivers;
  • MediaTek SoC drivers;
  • Microchip PolarFire SoC system controller driver;
  • Texas Instruments SoC drivers;
  • SPI subsystem;
  • Greybus lights staging drivers;
  • Media staging drivers;
  • Realtek RTL8723BS SDIO drivers;
  • SM750 framebuffer staging driver;
  • TCM subsystem;
  • Thermal drivers;
  • TTY drivers;
  • UFS subsystem;
  • Cadence USB3 driver;
  • ChipIdea USB driver;
  • USB Device Class drivers;
  • ULPI bus;
  • USB core drivers;
  • DesignWare USB2 driver;
  • DesignWare USB3 driver;
  • USB Gadget drivers;
  • USB Host Controller drivers;
  • Mustek MDC800 USB digital camera driver;
  • USB YUREX driver;
  • Renesas USBHS Controller drivers;
  • USB Type-C Connector System Software Interface driver;
  • USB over IP driver;
  • vDPA drivers;
  • VFIO drivers;
  • Virtio Host (VHOST) subsystem;
  • Framebuffer layer;
  • TSM TDX Guest driver;
  • Xen hypervisor drivers;
  • File systems infrastructure;
  • BTRFS file system;
  • Ceph distributed file system;
  • EROFS file system;
  • Ext4 file system;
  • F2FS file system;
  • FAT file system;
  • FUSE (File system in Userspace);
  • GFS2 file system;
  • HFS+ file system;
  • Journaling layer for block devices (JBD2);
  • JFS file system;
  • Network file systems library;
  • Network file system (NFS) server daemon;
  • NILFS2 file system;
  • File system notification infrastructure;
  • NTFS3 file system;
  • OCFS2 file system;
  • Proc file system;
  • Pstore file system;
  • Diskquota system;
  • SMB network file system;
  • SquashFS file system;
  • Tracing file system;
  • UDF file system;
  • XFS file system;
  • Audit subsystem;
  • Kernel CPU control infrastructure;
  • QorIQ DPAA2 FSL-MC bus driver;
  • Memory Management;
  • Integrity Measurement Architecture(IMA) framework;
  • KVM subsystem;
  • Memory management;
  • Networking core;
  • padata parallel execution mechanism;
  • PPP protocol drivers and compressors;
  • Linux Security Modules (LSM) Framework;
  • Tracing infrastructure;
  • Network traffic control;
  • Distributed Switch Architecture;
  • IPv4 networking;
  • IPv6 networking;
  • IP tunnels definitions;
  • MAC80211 subsystem;
  • Netfilter;
  • User-space API (UAPI);
  • io_uring subsystem;
  • BPF subsystem;
  • Control group (cgroup);
  • Perf events;
  • Kernel exit() syscall;
  • Kernel fork() syscall;
  • Kernel futex primitives;
  • Kernel kexec() syscall;
  • KProbes tracing;
  • Locking primitives;
  • Kernel module support;
  • Padata parallel execution mechanism;
  • RCU subsystem;
  • Scheduler infrastructure;
  • Cryptographic library;
  • Scatterlist API;
  • Heterogeneous memory management;
  • KASAN memory debugging framework;
  • 9P file system network protocol;
  • Asynchronous Transfer Mode (ATM) subsystem;
  • B.A.T.M.A.N. meshing protocol;
  • Bluetooth subsystem;
  • Ethernet bridge;
  • CAIF protocol;
  • CAN network layer;
  • Ceph Core library;
  • KCM (Kernel Connection Multiplexor) sockets driver;
  • XFRM subsystem;
  • L2TP protocol;
  • Management Component Transport Protocol (MCTP);
  • Multipath TCP;
  • NCSI (Network Controller Sideband Interface) driver;
  • NFC subsystem;
  • Open vSwitch;
  • Packet sockets;
  • Qualcomm IPC Router (QRTR);
  • RDS protocol;
  • RF switch subsystem;
  • Rose network layer;
  • RxRPC session sockets;
  • SCTP protocol;
  • SMC sockets;
  • Stream parser;
  • Sun RPC protocol;
  • TIPC protocol;
  • TLS protocol;
  • Unix domain sockets;
  • VMware vSockets driver;
  • Wireless networking;
  • X.25 network layer;
  • eXpress Data Path;
  • AppArmor security module;
  • Landlock security;
  • Simplified Mandatory Access Control Kernel framework;
  • ALSA framework;
  • Generic PCM loopback sound driver;
  • FireWire sound drivers;
  • HD-audio driver;
  • Creative Sound Blaster X-Fi driver;
  • AMD SoC Alsa drivers;
  • QCOM ASoC drivers;
  • Renesas ASoC drivers;
  • Samsung ASoC drivers;
  • SoC audio core 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
22.04 LTS jammy linux-image-6.8.0-1062-azure-fde –  6.8.0-1062.69~22.04.1
linux-image-azure-fde –  6.8.0-1062.69~22.04.1
linux-image-azure-fde-6.8 –  6.8.0-1062.69~22.04.1

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References

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