CWE
416
Advisory Published

USN-5094-1: Linux kernel vulnerabilities

First published: Wed Sep 29 2021(Updated: )

It was discovered that the KVM hypervisor implementation in the Linux kernel did not properly perform reference counting in some situations, leading to a use-after-free vulnerability. An attacker who could start and control a VM could possibly use this to expose sensitive information or execute arbitrary code. (CVE-2021-22543) It was discovered that the tracing subsystem in the Linux kernel did not properly keep track of per-cpu ring buffer state. A privileged attacker could use this to cause a denial of service. (CVE-2021-3679) Alois Wohlschlager discovered that the overlay file system in the Linux kernel did not restrict private clones in some situations. An attacker could use this to expose sensitive information. (CVE-2021-3732) Alexey Kardashevskiy discovered that the KVM implementation for PowerPC systems in the Linux kernel did not properly validate RTAS arguments in some situations. An attacker in a guest vm could use this to cause a denial of service (host OS crash) or possibly execute arbitrary code. (CVE-2021-37576) It was discovered that the MAX-3421 host USB device driver in the Linux kernel did not properly handle device removal events. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2021-38204) It was discovered that the Xilinx 10/100 Ethernet Lite device driver in the Linux kernel could report pointer addresses in some situations. An attacker could use this information to ease the exploitation of another vulnerability. (CVE-2021-38205)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-4.15.0-1028-dell300x<4.15.0-1028.33
4.15.0-1028.33
=18.04
All of
ubuntu/linux-image-4.15.0-1081-oracle<4.15.0-1081.89
4.15.0-1081.89
=18.04
All of
ubuntu/linux-image-4.15.0-1100-kvm<4.15.0-1100.102
4.15.0-1100.102
=18.04
All of
ubuntu/linux-image-4.15.0-1109-gcp<4.15.0-1109.123
4.15.0-1109.123
=18.04
All of
ubuntu/linux-image-4.15.0-1112-aws<4.15.0-1112.119
4.15.0-1112.119
=18.04
All of
ubuntu/linux-image-4.15.0-1113-snapdragon<4.15.0-1113.122
4.15.0-1113.122
=18.04
All of
ubuntu/linux-image-4.15.0-1124-azure<4.15.0-1124.137
4.15.0-1124.137
=18.04
All of
ubuntu/linux-image-4.15.0-159-generic<4.15.0-159.167
4.15.0-159.167
=18.04
All of
ubuntu/linux-image-4.15.0-159-generic-lpae<4.15.0-159.167
4.15.0-159.167
=18.04
All of
ubuntu/linux-image-4.15.0-159-lowlatency<4.15.0-159.167
4.15.0-159.167
=18.04
All of
ubuntu/linux-image-aws-lts-18.04<4.15.0.1112.115
4.15.0.1112.115
=18.04
All of
ubuntu/linux-image-azure-lts-18.04<4.15.0.1124.97
4.15.0.1124.97
=18.04
All of
ubuntu/linux-image-dell300x<4.15.0.1028.30
4.15.0.1028.30
=18.04
All of
ubuntu/linux-image-gcp-lts-18.04<4.15.0.1109.128
4.15.0.1109.128
=18.04
All of
ubuntu/linux-image-generic<4.15.0.159.148
4.15.0.159.148
=18.04
All of
ubuntu/linux-image-generic-lpae<4.15.0.159.148
4.15.0.159.148
=18.04
All of
ubuntu/linux-image-kvm<4.15.0.1100.96
4.15.0.1100.96
=18.04
All of
ubuntu/linux-image-lowlatency<4.15.0.159.148
4.15.0.159.148
=18.04
All of
ubuntu/linux-image-oracle-lts-18.04<4.15.0.1081.91
4.15.0.1081.91
=18.04
All of
ubuntu/linux-image-snapdragon<4.15.0.1113.116
4.15.0.1113.116
=18.04
All of
ubuntu/linux-image-virtual<4.15.0.159.148
4.15.0.159.148
=18.04
All of
ubuntu/linux-image-4.15.0-1081-oracle<4.15.0-1081.89~16.04.1
4.15.0-1081.89~16.04.1
=16.04
All of
ubuntu/linux-image-4.15.0-1109-gcp<4.15.0-1109.123~16.04.1
4.15.0-1109.123~16.04.1
=16.04
All of
ubuntu/linux-image-4.15.0-1112-aws<4.15.0-1112.119~16.04.1
4.15.0-1112.119~16.04.1
=16.04
All of
ubuntu/linux-image-4.15.0-1124-azure<4.15.0-1124.137~16.04.1
4.15.0-1124.137~16.04.1
=16.04
All of
ubuntu/linux-image-4.15.0-159-generic<4.15.0-159.167~16.04.1
4.15.0-159.167~16.04.1
=16.04
All of
ubuntu/linux-image-4.15.0-159-lowlatency<4.15.0-159.167~16.04.1
4.15.0-159.167~16.04.1
=16.04
All of
ubuntu/linux-image-aws-hwe<4.15.0.1112.103
4.15.0.1112.103
=16.04
All of
ubuntu/linux-image-azure<4.15.0.1124.115
4.15.0.1124.115
=16.04
All of
ubuntu/linux-image-gcp<4.15.0.1109.110
4.15.0.1109.110
=16.04
All of
ubuntu/linux-image-generic-hwe-16.04<4.15.0.159.152
4.15.0.159.152
=16.04
All of
ubuntu/linux-image-gke<4.15.0.1109.110
4.15.0.1109.110
=16.04
All of
ubuntu/linux-image-lowlatency-hwe-16.04<4.15.0.159.152
4.15.0.159.152
=16.04
All of
ubuntu/linux-image-oem<4.15.0.159.152
4.15.0.159.152
=16.04
All of
ubuntu/linux-image-oracle<4.15.0.1081.69
4.15.0.1081.69
=16.04
All of
ubuntu/linux-image-virtual-hwe-16.04<4.15.0.159.152
4.15.0.159.152
=16.04
All of
ubuntu/linux-image-4.15.0-1124-azure<4.15.0-1124.137~14.04.1
4.15.0-1124.137~14.04.1
=14.04
All of
ubuntu/linux-image-azure<4.15.0.1124.97
4.15.0.1124.97
=14.04

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