1. Ubuntu Security Notices
  2. USN-7186-2

USN-7186-2: Linux kernel vulnerabilities

Publication date

9 January 2025

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

Andy Nguyen discovered that the Bluetooth L2CAP implementation in the Linux
kernel contained a type-confusion error. A physically proximate remote
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2020-12351)

Andy Nguyen discovered that the Bluetooth A2MP implementation in the Linux
kernel did not properly initialize memory in some situations. A physically
proximate remote attacker could use this to expose sensitive information
(kernel memory). (CVE-2020-12352)

Andy Nguyen discovered that the Bluetooth HCI event packet parser in the
Linux kernel did not properly handle event advertisements of certain sizes,
leading to a heap-based buffer overflow. A physically proximate remote
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (

Andy Nguyen discovered that the Bluetooth L2CAP implementation in the Linux
kernel contained a type-confusion error. A physically proximate remote
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2020-12351)

Andy Nguyen discovered that the Bluetooth A2MP implementation in the Linux
kernel did not properly initialize memory in some situations. A physically
proximate remote attacker could use this to expose sensitive information
(kernel memory). (CVE-2020-12352)

Andy Nguyen discovered that the Bluetooth HCI event packet parser in the
Linux kernel did not properly handle event advertisements of certain sizes,
leading to a heap-based buffer overflow. A physically proximate remote
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2020-24490)

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;
  • RISC-V architecture;
  • S390 architecture;
  • x86 architecture;
  • Block layer subsystem;
  • ACPI drivers;
  • Drivers core;
  • ATA over ethernet (AOE) driver;
  • TPM device driver;
  • Clock framework and drivers;
  • Buffer Sharing and Synchronization framework;
  • EFI core;
  • GPIO subsystem;
  • GPU drivers;
  • HID subsystem;
  • I2C subsystem;
  • InfiniBand drivers;
  • Input Device core drivers;
  • Mailbox framework;
  • Media drivers;
  • Ethernet bonding driver;
  • Network drivers;
  • Mellanox network drivers;
  • Microsoft Azure Network Adapter (MANA) driver;
  • STMicroelectronics network drivers;
  • NTB driver;
  • Virtio pmem driver;
  • PCI subsystem;
  • x86 platform drivers;
  • S/390 drivers;
  • SCSI subsystem;
  • SPI subsystem;
  • Thermal drivers;
  • USB Device Class drivers;
  • USB Type-C Port Controller Manager driver;
  • VFIO drivers;
  • Virtio Host (VHOST) subsystem;
  • Framebuffer layer;
  • 9P distributed file system;
  • BTRFS file system;
  • Ceph distributed file system;
  • File systems infrastructure;
  • Ext4 file system;
  • F2FS file system;
  • GFS2 file system;
  • JFS file system;
  • Network file system (NFS) client;
  • Network file system (NFS) server daemon;
  • NILFS2 file system;
  • SMB network file system;
  • Network file system (NFS) superblock;
  • Bluetooth subsystem;
  • Network traffic control;
  • Network sockets;
  • TCP network protocol;
  • BPF subsystem;
  • Perf events;
  • Kernel thread helper (kthread);
  • Padata parallel execution mechanism;
  • Arbitrary resource management;
  • Static call mechanism;
  • Tracing infrastructure;
  • Memory management;
  • Amateur Radio drivers;
  • Ethernet bridge;
  • CAN network layer;
  • Networking core;
  • IPv4 networking;
  • IPv6 networking;
  • MAC80211 subsystem;
  • Multipath TCP;
  • Netfilter;
  • Netlink;
  • SCTP protocol;
  • TIPC protocol;
  • VMware vSockets driver;
  • SELinux security module;
  • Simplified Mandatory Access Control Kernel framework;
  • AudioScience HPI driver;
  • Amlogic Meson SoC drivers;
  • USB sound devices

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 jammy linux-image-5.15.0-1078-azure –  5.15.0-1078.87
linux-image-azure-lts-22.04 –  5.15.0.1078.76
20.04 focal linux-image-5.15.0-1071-intel-iotg –  5.15.0-1071.77~20.04.1
linux-image-intel –  5.15.0.1071.77~20.04.1
linux-image-intel-iotg –  5.15.0.1071.77~20.04.1

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References

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