1. Ubuntu Security Notices
  2. USN-4591-1

USN-4591-1: Linux kernel vulnerabilities

Publication date

19 October 2020

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 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)

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
20.04 focal linux-image-5.4.0-1022-raspi –  5.4.0-1022.25
linux-image-5.4.0-52-generic –  5.4.0-52.57
linux-image-5.4.0-52-generic-lpae –  5.4.0-52.57
linux-image-5.4.0-52-lowlatency –  5.4.0-52.57
linux-image-generic –  5.4.0.52.55
linux-image-generic-hwe-18.04 –  5.4.0.52.55
linux-image-generic-hwe-18.04-edge –  5.4.0.52.55
linux-image-generic-hwe-20.04 –  5.4.0.52.55
linux-image-generic-lpae –  5.4.0.52.55
linux-image-generic-lpae-hwe-18.04 –  5.4.0.52.55
linux-image-generic-lpae-hwe-18.04-edge –  5.4.0.52.55
linux-image-generic-lpae-hwe-20.04 –  5.4.0.52.55
linux-image-lowlatency –  5.4.0.52.55
linux-image-lowlatency-hwe-18.04 –  5.4.0.52.55
linux-image-lowlatency-hwe-18.04-edge –  5.4.0.52.55
linux-image-lowlatency-hwe-20.04 –  5.4.0.52.55
linux-image-oem –  5.4.0.52.55
linux-image-oem-osp1 –  5.4.0.52.55
linux-image-raspi –  5.4.0.1022.57
linux-image-raspi-hwe-18.04 –  5.4.0.1022.57
linux-image-raspi-hwe-18.04-edge –  5.4.0.1022.57
linux-image-raspi2 –  5.4.0.1022.57
linux-image-raspi2-hwe-18.04 –  5.4.0.1022.57
linux-image-raspi2-hwe-18.04-edge –  5.4.0.1022.57
linux-image-virtual –  5.4.0.52.55
linux-image-virtual-hwe-18.04 –  5.4.0.52.55
linux-image-virtual-hwe-18.04-edge –  5.4.0.52.55
linux-image-virtual-hwe-20.04 –  5.4.0.52.55
18.04 bionic linux-image-4.15.0-1090-snapdragon –  4.15.0-1090.99
linux-image-4.15.0-1100-oem –  4.15.0-1100.110
linux-image-4.15.0-122-generic –  4.15.0-122.124
linux-image-4.15.0-122-generic-lpae –  4.15.0-122.124
linux-image-4.15.0-122-lowlatency –  4.15.0-122.124
linux-image-5.4.0-1022-raspi –  5.4.0-1022.25~18.04.1
linux-image-5.4.0-52-generic –  5.4.0-52.57~18.04.1
linux-image-5.4.0-52-generic-lpae –  5.4.0-52.57~18.04.1
linux-image-5.4.0-52-lowlatency –  5.4.0-52.57~18.04.1
linux-image-generic –  4.15.0.122.109
linux-image-generic-hwe-18.04 –  5.4.0.52.57~18.04.46
linux-image-generic-lpae –  4.15.0.122.109
linux-image-generic-lpae-hwe-18.04 –  5.4.0.52.57~18.04.46
linux-image-lowlatency –  4.15.0.122.109
linux-image-lowlatency-hwe-18.04 –  5.4.0.52.57~18.04.46
linux-image-oem –  4.15.0.1100.104
linux-image-raspi-hwe-18.04 –  5.4.0.1022.26
linux-image-snapdragon –  4.15.0.1090.93
linux-image-snapdragon-hwe-18.04 –  5.4.0.52.57~18.04.46
linux-image-virtual –  4.15.0.122.109
linux-image-virtual-hwe-18.04 –  5.4.0.52.57~18.04.46
16.04 xenial linux-image-4.15.0-122-generic –  4.15.0-122.124~16.04.1
linux-image-4.15.0-122-generic-lpae –  4.15.0-122.124~16.04.1
linux-image-4.15.0-122-lowlatency –  4.15.0-122.124~16.04.1
linux-image-generic-hwe-16.04 –  4.15.0.122.122
linux-image-generic-hwe-16.04-edge –  4.15.0.122.122
linux-image-generic-lpae-hwe-16.04 –  4.15.0.122.122
linux-image-generic-lpae-hwe-16.04-edge –  4.15.0.122.122
linux-image-lowlatency-hwe-16.04 –  4.15.0.122.122
linux-image-lowlatency-hwe-16.04-edge –  4.15.0.122.122
linux-image-oem –  4.15.0.122.122
linux-image-virtual-hwe-16.04 –  4.15.0.122.122
linux-image-virtual-hwe-16.04-edge –  4.15.0.122.122

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References

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