USN-7453-1: Linux kernel (Real-time) vulnerabilities

USN-7453-1: Linux kernel (Real-time) vulnerabilities
23 April 2025

Several security issues were fixed in the Linux kernel.

Releases

• Ubuntu 24.04 LTS

Packages

• linux-realtime - Linux kernel for Real-time systems

Details
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;
• SuperH RISC architecture;
• User-Mode Linux (UML);
• x86 architecture;
• Block layer subsystem;
• Cryptographic API;
• Compute Acceleration Framework;
• ACPI drivers;
• Drivers core;
• RAM backed block device driver;
• Compressed RAM block device driver;
• TPM device driver;
• Clock framework and drivers;
• Data acquisition framework and drivers;
• CPU frequency scaling framework;
• Hardware crypto device drivers;
• CXL (Compute Express Link) drivers;
• EDAC drivers;
• ARM SCMI message protocol;
• ARM SCPI message protocol;
• EFI core;
• GPIO subsystem;
• GPU drivers;
• HID subsystem;
• I3C subsystem;
• IIO ADC drivers;
• IIO subsystem;
• InfiniBand drivers;
• IOMMU subsystem;
• LED subsystem;
• Multiple devices driver;
• Media drivers;
• Multifunction device drivers;
• MMC subsystem;
• MTD block device drivers;
• Network drivers;
• Mellanox network drivers;
• STMicroelectronics network drivers;
• NVME drivers;
• PCI subsystem;
• PHY drivers;
• Pin controllers subsystem;
• x86 platform drivers;
• i.MX PM domains;
• Voltage and Current Regulator drivers;
• StarFive reset controller drivers;
• Real Time Clock drivers;
• SCSI subsystem;
• i.MX SoC drivers;
• QCOM SoC drivers;
• Xilinx SoC drivers;
• SPI subsystem;
• Media staging drivers;
• TCM subsystem;
• UFS subsystem;
• DesignWare USB3 driver;
• USB Dual Role (OTG-ready) Controller drivers;
• USB Serial drivers;
• USB Type-C support driver;
• USB Type-C Port Controller Manager driver;
• USB Type-C Connector System Software Interface driver;
• vDPA drivers;
• VFIO drivers;
• Framebuffer layer;
• Xen hypervisor drivers;
• AFS file system;
• BTRFS file system;
• File systems infrastructure;
• EROFS file system;
• F2FS file system;
• JFFS2 file system;
• JFS file system;
• Network file systems library;
• Network file system (NFS) client;
• Network file system (NFS) server daemon;
• NILFS2 file system;
• NTFS3 file system;
• Overlay file system;
• Proc file system;
• Diskquota system;
• SMB network file system;
• UBI file system;
• DRM display driver;
• BPF subsystem;
• StackDepot library;
• Bluetooth subsystem;
• IP tunnels definitions;
• Netfilter;
• Tracing infrastructure;
• User-space API (UAPI);
• Kernel init infrastructure;
• io_uring subsystem;
• IPC subsystem;
• DMA mapping infrastructure;
• Kernel fork() syscall;
• KCSAN framework;
• RCU subsystem;
• Arbitrary resource management;
• Scheduler infrastructure;
• Signal handling mechanism;
• Task handling mechanism;
• Timer subsystem;
• KUnit library;
• Memory management;
• 9P file system network protocol;
• CAN network layer;
• Networking core;
• DCCP (Datagram Congestion Control Protocol);
• Ethtool driver;
• HSR network protocol;
• IEEE802154.4 network protocol;
• IPv4 networking;
• IPv6 networking;
• IUCV driver;
• MAC80211 subsystem;
• Multipath TCP;
• Packet sockets;
• RxRPC session sockets;
• Network traffic control;
• SCTP protocol;
• SMC sockets;
• Sun RPC protocol;
• TIPC protocol;
• VMware vSockets driver;
• Wireless networking;
• eXpress Data Path;
• XFRM subsystem;
• Integrity Measurement Architecture(IMA) framework;
• Key management;
• ALSA framework;
• FireWire sound drivers;
• HD-audio driver;
• MediaTek ASoC drivers;
• QCOM ASoC drivers;
• SoC audio core drivers;
• STMicroelectronics SoC drivers;
• USB sound devices;

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

Ubuntu 24.04

• linux-image-6.8.1-1020-realtime - 6.8.1-1020.21
• linux-image-realtime - 6.8.1-1020.21
• linux-image-realtime-hwe-24.04 - 6.8.1-1020.21
  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.