Advisory Published

USN-5073-1: Linux kernel vulnerabilities

First published: Thu Sep 09 2021(Updated: )

Maxim Levitsky and Paolo Bonzini discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel allowed a guest VM to disable restrictions on VMLOAD/VMSAVE in a nested guest. An attacker in a guest VM could use this to read or write portions of the host's physical memory. (CVE-2021-3656) Maxim Levitsky discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel did not properly prevent a guest VM from enabling AVIC in nested guest VMs. An attacker in a guest VM could use this to write to portions of the host's physical memory. (CVE-2021-3653) Norbert Slusarek discovered that the CAN broadcast manger (bcm) protocol implementation in the Linux kernel did not properly initialize memory in some situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2021-34693) Murray McAllister discovered that the joystick device interface in the Linux kernel did not properly validate data passed via an ioctl(). A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code on systems with a joystick device registered. (CVE-2021-3612) It was discovered that the Virtio console implementation in the Linux kernel did not properly validate input lengths in some situations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2021-38160)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-4.15.0-1027-dell300x<4.15.0-1027.32
4.15.0-1027.32
=18.04
All of
ubuntu/linux-image-4.15.0-1080-oracle<4.15.0-1080.88
4.15.0-1080.88
=18.04
All of
ubuntu/linux-image-4.15.0-1099-kvm<4.15.0-1099.101
4.15.0-1099.101
=18.04
All of
ubuntu/linux-image-4.15.0-1111-aws<4.15.0-1111.118
4.15.0-1111.118
=18.04
All of
ubuntu/linux-image-4.15.0-1112-snapdragon<4.15.0-1112.121
4.15.0-1112.121
=18.04
All of
ubuntu/linux-image-4.15.0-1123-azure<4.15.0-1123.136
4.15.0-1123.136
=18.04
All of
ubuntu/linux-image-4.15.0-156-generic<4.15.0-156.163
4.15.0-156.163
=18.04
All of
ubuntu/linux-image-4.15.0-156-generic-lpae<4.15.0-156.163
4.15.0-156.163
=18.04
All of
ubuntu/linux-image-4.15.0-156-lowlatency<4.15.0-156.163
4.15.0-156.163
=18.04
All of
ubuntu/linux-image-aws-lts-18.04<4.15.0.1111.114
4.15.0.1111.114
=18.04
All of
ubuntu/linux-image-azure-lts-18.04<4.15.0.1123.96
4.15.0.1123.96
=18.04
All of
ubuntu/linux-image-dell300x<4.15.0.1027.29
4.15.0.1027.29
=18.04
All of
ubuntu/linux-image-generic<4.15.0.156.145
4.15.0.156.145
=18.04
All of
ubuntu/linux-image-generic-lpae<4.15.0.156.145
4.15.0.156.145
=18.04
All of
ubuntu/linux-image-kvm<4.15.0.1099.95
4.15.0.1099.95
=18.04
All of
ubuntu/linux-image-lowlatency<4.15.0.156.145
4.15.0.156.145
=18.04
All of
ubuntu/linux-image-oracle-lts-18.04<4.15.0.1080.90
4.15.0.1080.90
=18.04
All of
ubuntu/linux-image-snapdragon<4.15.0.1112.115
4.15.0.1112.115
=18.04
All of
ubuntu/linux-image-virtual<4.15.0.156.145
4.15.0.156.145
=18.04
All of
ubuntu/linux-image-4.15.0-1080-oracle<4.15.0-1080.88~16.04.1
4.15.0-1080.88~16.04.1
=16.04
All of
ubuntu/linux-image-4.15.0-1111-aws<4.15.0-1111.118~16.04.1
4.15.0-1111.118~16.04.1
=16.04
All of
ubuntu/linux-image-4.15.0-1123-azure<4.15.0-1123.136~16.04.1
4.15.0-1123.136~16.04.1
=16.04
All of
ubuntu/linux-image-4.15.0-156-generic<4.15.0-156.163~16.04.1
4.15.0-156.163~16.04.1
=16.04
All of
ubuntu/linux-image-4.15.0-156-lowlatency<4.15.0-156.163~16.04.1
4.15.0-156.163~16.04.1
=16.04
All of
ubuntu/linux-image-aws-hwe<4.15.0.1111.102
4.15.0.1111.102
=16.04
All of
ubuntu/linux-image-azure<4.15.0.1123.114
4.15.0.1123.114
=16.04
All of
ubuntu/linux-image-generic-hwe-16.04<4.15.0.156.149
4.15.0.156.149
=16.04
All of
ubuntu/linux-image-lowlatency-hwe-16.04<4.15.0.156.149
4.15.0.156.149
=16.04
All of
ubuntu/linux-image-oem<4.15.0.156.149
4.15.0.156.149
=16.04
All of
ubuntu/linux-image-oracle<4.15.0.1080.68
4.15.0.1080.68
=16.04
All of
ubuntu/linux-image-virtual-hwe-16.04<4.15.0.156.149
4.15.0.156.149
=16.04
All of
ubuntu/linux-image-4.15.0-1123-azure<4.15.0-1123.136~14.04.1
4.15.0-1123.136~14.04.1
=14.04
All of
ubuntu/linux-image-azure<4.15.0.1123.96
4.15.0.1123.96
=14.04

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