Advisory Published

USN-4591-1: Linux kernel vulnerabilities

First published: Mon Oct 19 2020(Updated: )

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)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-5.4.0-1022-raspi<5.4.0-1022.25
5.4.0-1022.25
Ubuntu=20.04
All of
ubuntu/linux-image-5.4.0-52-generic<5.4.0-52.57
5.4.0-52.57
Ubuntu=20.04
All of
ubuntu/linux-image-5.4.0-52-generic-lpae<5.4.0-52.57
5.4.0-52.57
Ubuntu=20.04
All of
ubuntu/linux-image-5.4.0-52-lowlatency<5.4.0-52.57
5.4.0-52.57
Ubuntu=20.04
All of
ubuntu/linux-image-generic<5.4.0.52.55
5.4.0.52.55
Ubuntu=20.04
All of
ubuntu/linux-image-generic-hwe-18.04<5.4.0.52.55
5.4.0.52.55
Ubuntu=20.04
All of
ubuntu/linux-image-generic-hwe-18.04-edge<5.4.0.52.55
5.4.0.52.55
Ubuntu=20.04
All of
ubuntu/linux-image-generic-hwe-20.04<5.4.0.52.55
5.4.0.52.55
Ubuntu=20.04
All of
ubuntu/linux-image-generic-lpae<5.4.0.52.55
5.4.0.52.55
Ubuntu=20.04
All of
ubuntu/linux-image-generic-lpae-hwe-18.04<5.4.0.52.55
5.4.0.52.55
Ubuntu=20.04
All of
ubuntu/linux-image-generic-lpae-hwe-18.04-edge<5.4.0.52.55
5.4.0.52.55
Ubuntu=20.04
All of
ubuntu/linux-image-generic-lpae-hwe-20.04<5.4.0.52.55
5.4.0.52.55
Ubuntu=20.04
All of
ubuntu/linux-image-lowlatency<5.4.0.52.55
5.4.0.52.55
Ubuntu=20.04
All of
ubuntu/linux-image-lowlatency-hwe-18.04<5.4.0.52.55
5.4.0.52.55
Ubuntu=20.04
All of
ubuntu/linux-image-lowlatency-hwe-18.04-edge<5.4.0.52.55
5.4.0.52.55
Ubuntu=20.04
All of
ubuntu/linux-image-lowlatency-hwe-20.04<5.4.0.52.55
5.4.0.52.55
Ubuntu=20.04
All of
ubuntu/linux-image-oem<5.4.0.52.55
5.4.0.52.55
Ubuntu=20.04
All of
ubuntu/linux-image-oem-osp1<5.4.0.52.55
5.4.0.52.55
Ubuntu=20.04
All of
ubuntu/linux-image-raspi<5.4.0.1022.57
5.4.0.1022.57
Ubuntu=20.04
All of
ubuntu/linux-image-raspi-hwe-18.04<5.4.0.1022.57
5.4.0.1022.57
Ubuntu=20.04
All of
ubuntu/linux-image-raspi-hwe-18.04-edge<5.4.0.1022.57
5.4.0.1022.57
Ubuntu=20.04
All of
ubuntu/linux-image-raspi2<5.4.0.1022.57
5.4.0.1022.57
Ubuntu=20.04
All of
ubuntu/linux-image-raspi2-hwe-18.04<5.4.0.1022.57
5.4.0.1022.57
Ubuntu=20.04
All of
ubuntu/linux-image-raspi2-hwe-18.04-edge<5.4.0.1022.57
5.4.0.1022.57
Ubuntu=20.04
All of
ubuntu/linux-image-virtual<5.4.0.52.55
5.4.0.52.55
Ubuntu=20.04
All of
ubuntu/linux-image-virtual-hwe-18.04<5.4.0.52.55
5.4.0.52.55
Ubuntu=20.04
All of
ubuntu/linux-image-virtual-hwe-18.04-edge<5.4.0.52.55
5.4.0.52.55
Ubuntu=20.04
All of
ubuntu/linux-image-virtual-hwe-20.04<5.4.0.52.55
5.4.0.52.55
Ubuntu=20.04
All of
ubuntu/linux-image-4.15.0-1090-snapdragon<4.15.0-1090.99
4.15.0-1090.99
Ubuntu=18.04
All of
ubuntu/linux-image-4.15.0-1100-oem<4.15.0-1100.110
4.15.0-1100.110
Ubuntu=18.04
All of
ubuntu/linux-image-4.15.0-122-generic<4.15.0-122.124
4.15.0-122.124
Ubuntu=18.04
All of
ubuntu/linux-image-4.15.0-122-generic-lpae<4.15.0-122.124
4.15.0-122.124
Ubuntu=18.04
All of
ubuntu/linux-image-4.15.0-122-lowlatency<4.15.0-122.124
4.15.0-122.124
Ubuntu=18.04
All of
ubuntu/linux-image-5.4.0-1022-raspi<5.4.0-1022.25~18.04.1
5.4.0-1022.25~18.04.1
Ubuntu=18.04
All of
ubuntu/linux-image-5.4.0-52-generic<5.4.0-52.57~18.04.1
5.4.0-52.57~18.04.1
Ubuntu=18.04
All of
ubuntu/linux-image-5.4.0-52-generic-lpae<5.4.0-52.57~18.04.1
5.4.0-52.57~18.04.1
Ubuntu=18.04
All of
ubuntu/linux-image-5.4.0-52-lowlatency<5.4.0-52.57~18.04.1
5.4.0-52.57~18.04.1
Ubuntu=18.04
All of
ubuntu/linux-image-generic<4.15.0.122.109
4.15.0.122.109
Ubuntu=18.04
All of
ubuntu/linux-image-generic-hwe-18.04<5.4.0.52.57~18.04.46
5.4.0.52.57~18.04.46
Ubuntu=18.04
All of
ubuntu/linux-image-generic-lpae<4.15.0.122.109
4.15.0.122.109
Ubuntu=18.04
All of
ubuntu/linux-image-generic-lpae-hwe-18.04<5.4.0.52.57~18.04.46
5.4.0.52.57~18.04.46
Ubuntu=18.04
All of
ubuntu/linux-image-lowlatency<4.15.0.122.109
4.15.0.122.109
Ubuntu=18.04
All of
ubuntu/linux-image-lowlatency-hwe-18.04<5.4.0.52.57~18.04.46
5.4.0.52.57~18.04.46
Ubuntu=18.04
All of
ubuntu/linux-image-oem<4.15.0.1100.104
4.15.0.1100.104
Ubuntu=18.04
All of
ubuntu/linux-image-raspi-hwe-18.04<5.4.0.1022.26
5.4.0.1022.26
Ubuntu=18.04
All of
ubuntu/linux-image-snapdragon<4.15.0.1090.93
4.15.0.1090.93
Ubuntu=18.04
All of
ubuntu/linux-image-snapdragon-hwe-18.04<5.4.0.52.57~18.04.46
5.4.0.52.57~18.04.46
Ubuntu=18.04
All of
ubuntu/linux-image-virtual<4.15.0.122.109
4.15.0.122.109
Ubuntu=18.04
All of
ubuntu/linux-image-virtual-hwe-18.04<5.4.0.52.57~18.04.46
5.4.0.52.57~18.04.46
Ubuntu=18.04
All of
ubuntu/linux-image-4.15.0-122-generic<4.15.0-122.124~16.04.1
4.15.0-122.124~16.04.1
Ubuntu=16.04
All of
ubuntu/linux-image-4.15.0-122-generic-lpae<4.15.0-122.124~16.04.1
4.15.0-122.124~16.04.1
Ubuntu=16.04
All of
ubuntu/linux-image-4.15.0-122-lowlatency<4.15.0-122.124~16.04.1
4.15.0-122.124~16.04.1
Ubuntu=16.04
All of
ubuntu/linux-image-generic-hwe-16.04<4.15.0.122.122
4.15.0.122.122
Ubuntu=16.04
All of
ubuntu/linux-image-generic-hwe-16.04-edge<4.15.0.122.122
4.15.0.122.122
Ubuntu=16.04
All of
ubuntu/linux-image-generic-lpae-hwe-16.04<4.15.0.122.122
4.15.0.122.122
Ubuntu=16.04
All of
ubuntu/linux-image-generic-lpae-hwe-16.04-edge<4.15.0.122.122
4.15.0.122.122
Ubuntu=16.04
All of
ubuntu/linux-image-lowlatency-hwe-16.04<4.15.0.122.122
4.15.0.122.122
Ubuntu=16.04
All of
ubuntu/linux-image-lowlatency-hwe-16.04-edge<4.15.0.122.122
4.15.0.122.122
Ubuntu=16.04
All of
ubuntu/linux-image-oem<4.15.0.122.122
4.15.0.122.122
Ubuntu=16.04
All of
ubuntu/linux-image-virtual-hwe-16.04<4.15.0.122.122
4.15.0.122.122
Ubuntu=16.04
All of
ubuntu/linux-image-virtual-hwe-16.04-edge<4.15.0.122.122
4.15.0.122.122
Ubuntu=16.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-4591-1?

    The severity of USN-4591-1 is high due to the potential for a denial of service or arbitrary code execution.

  • How do I fix USN-4591-1?

    To fix USN-4591-1, you should update to the recommended Linux kernel versions listed in the advisory.

  • What vulnerabilities are addressed by USN-4591-1?

    USN-4591-1 addresses type-confusion errors in the Bluetooth L2CAP implementation leading to potential exploits.

  • Who discovered the vulnerability in USN-4591-1?

    The vulnerability affecting USN-4591-1 was discovered by researcher Andy Nguyen.

  • Which systems are affected by USN-4591-1?

    USN-4591-1 affects specific versions of Ubuntu Linux 20.04 and 18.04 using certain Linux kernel packages.

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