LSN-0073-1: Kernel Live Patch Security Notice
23 October 2020
Linux kernel vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 LTS
- Ubuntu 20.04 LTS
Summary
Several security issues were fixed in the kernel.
Software Description
- linux - Linux kernel
- linux-aws - Linux kernel for Amazon Web Services (AWS) systems
- linux-azure - Linux kernel for Microsoft Azure Cloud systems
- linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
- linux-oem - Linux kernel for OEM systems
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. (CVE-2020-24490)
Update instructions
The problem can be corrected by updating your kernel livepatch to the following versions:
- Ubuntu 18.04 LTS
- aws - 73.1
- generic - 73.1
- lowlatency - 73.1
- oem - 73.1
- Ubuntu 20.04 LTS
- aws - 73.1
- azure - 73.1
- gcp - 73.1
- generic - 73.1
- lowlatency - 73.1
Support Information
Kernels older than the levels listed below do not receive livepatch updates. If you are running a kernel version earlier than the one listed below, please upgrade your kernel as soon as possible.
- Ubuntu 18.04 LTS
- linux-aws - 4.15.0-1054
- linux-azure - 5.0.0-1025
- linux-gcp - 5.0.0-1025
- linux-oem - 4.15.0-1063
- linux - 4.15.0-69
- Ubuntu 20.04 LTS
- linux-aws - 5.4.0-1009
- linux-azure - 5.4.0-1010
- linux-gcp - 5.4.0-1009
- linux-oem - 5.4.0-26
- linux - 5.4.0-26
- Ubuntu 16.04 LTS
- linux-aws - 4.4.0-1098
- linux-azure - 4.15.0-1063
- linux-hwe - 4.15.0-69
- linux - 4.4.0-168
- Ubuntu 14.04 ESM
- linux-lts-xenial - 4.4.0-168