1. Ubuntu Security Notices
  2. USN-6952-2

USN-6952-2: Linux kernel (Azure) vulnerabilities

Publication date

13 August 2024

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux-azure - Linux kernel for Microsoft Azure Cloud systems

Details

Benedict Schlüter, Supraja Sridhara, Andrin Bertschi, and Shweta Shinde
discovered that an untrusted hypervisor could inject malicious #VC
interrupts and compromise the security guarantees of AMD SEV-SNP. This flaw
is known as WeSee. A local attacker in control of the hypervisor could use
this to expose sensitive information or possibly execute arbitrary code in
the trusted execution environment. (CVE-2024-25742)

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:

  • ARM32 architecture;
  • ARM64 architecture;
  • M68K architecture;
  • OpenRISC architecture;
  • PowerPC architecture;
  • RISC-V architecture;
  • x86 architecture;
  • Block layer subsystem;
  • Accessibility subsystem;
  • Bluetooth drivers;
  • Clock...

Benedict Schlüter, Supraja Sridhara, Andrin Bertschi, and Shweta Shinde
discovered that an untrusted hypervisor could inject malicious #VC
interrupts and compromise the security guarantees of AMD SEV-SNP. This flaw
is known as WeSee. A local attacker in control of the hypervisor could use
this to expose sensitive information or possibly execute arbitrary code in
the trusted execution environment. (CVE-2024-25742)

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:

  • ARM32 architecture;
  • ARM64 architecture;
  • M68K architecture;
  • OpenRISC architecture;
  • PowerPC architecture;
  • RISC-V architecture;
  • x86 architecture;
  • Block layer subsystem;
  • Accessibility subsystem;
  • Bluetooth drivers;
  • Clock framework and drivers;
  • CPU frequency scaling framework;
  • Hardware crypto device drivers;
  • DMA engine subsystem;
  • DPLL subsystem;
  • FireWire subsystem;
  • EFI core;
  • Qualcomm firmware drivers;
  • GPIO subsystem;
  • GPU drivers;
  • HID subsystem;
  • Microsoft Hyper-V drivers;
  • I2C subsystem;
  • InfiniBand drivers;
  • IOMMU subsystem;
  • IRQ chip drivers;
  • Macintosh device drivers;
  • Multiple devices driver;
  • Media drivers;
  • EEPROM drivers;
  • MMC subsystem;
  • Network drivers;
  • STMicroelectronics network drivers;
  • Device tree and open firmware driver;
  • HiSilicon SoC PMU drivers;
  • PHY drivers;
  • Pin controllers subsystem;
  • Remote Processor subsystem;
  • S/390 drivers;
  • SCSI drivers;
  • SPI subsystem;
  • Media staging drivers;
  • Thermal drivers;
  • TTY drivers;
  • Userspace I/O drivers;
  • USB subsystem;
  • DesignWare USB3 driver;
  • ACRN Hypervisor Service Module driver;
  • Virtio drivers;
  • 9P distributed file system;
  • BTRFS file system;
  • eCrypt file system;
  • EROFS file system;
  • File systems infrastructure;
  • GFS2 file system;
  • JFFS2 file system;
  • Network file systems library;
  • Network file system client;
  • Network file system server daemon;
  • NILFS2 file system;
  • Proc file system;
  • SMB network file system;
  • Tracing file system;
  • Mellanox drivers;
  • Memory management;
  • Socket messages infrastructure;
  • Slab allocator;
  • Tracing infrastructure;
  • User-space API (UAPI);
  • Core kernel;
  • BPF subsystem;
  • DMA mapping infrastructure;
  • RCU subsystem;
  • Dynamic debug library;
  • KUnit library;
  • Maple Tree data structure library;
  • Heterogeneous memory management;
  • Amateur Radio drivers;
  • Bluetooth subsystem;
  • Ethernet bridge;
  • Networking core;
  • IPv4 networking;
  • IPv6 networking;
  • Multipath TCP;
  • Netfilter;
  • NET/ROM layer;
  • NFC subsystem;
  • NSH protocol;
  • Open vSwitch;
  • Phonet protocol;
  • SMC sockets;
  • TIPC protocol;
  • Unix domain sockets;
  • Wireless networking;
  • Key management;
  • ALSA framework;
  • HD-audio driver;
  • Kirkwood ASoC drivers;
  • MediaTek ASoC drivers

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-6.8.0-1012-azure –  6.8.0-1012.14
linux-image-6.8.0-1012-azure-fde –  6.8.0-1012.14
linux-image-azure –  6.8.0-1012.14
linux-image-azure-fde –  6.8.0-1012.14

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References

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