Advisory Published

USN-4917-1: Linux kernel vulnerabilities

First published: Thu Apr 15 2021(Updated: )

It was discovered that the overlayfs implementation in the Linux kernel did not properly validate the application of file system capabilities with respect to user namespaces. A local attacker could use this to gain elevated privileges. (CVE-2021-3493) Vincent Dehors discovered that the shiftfs file system in the Ubuntu Linux kernel did not properly handle faults in copy_from_user() when passing through ioctls to an underlying file system. A local attacker could use this to cause a denial of service (memory exhaustion) or execute arbitrary code. (CVE-2021-3492) Piotr Krysiuk discovered that the BPF JIT compiler for x86 in the Linux kernel did not properly validate computation of branch displacements in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-29154)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-5.8.0-1021-raspi<5.8.0-1021.24
5.8.0-1021.24
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-5.8.0-1021-raspi-nolpae<5.8.0-1021.24
5.8.0-1021.24
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-5.8.0-1024-kvm<5.8.0-1024.26
5.8.0-1024.26
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-5.8.0-1026-oracle<5.8.0-1026.27
5.8.0-1026.27
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-5.8.0-1028-gcp<5.8.0-1028.29
5.8.0-1028.29
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-5.8.0-1029-azure<5.8.0-1029.31
5.8.0-1029.31
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-5.8.0-1030-aws<5.8.0-1030.32
5.8.0-1030.32
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-5.8.0-50-generic<5.8.0-50.56
5.8.0-50.56
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-5.8.0-50-generic-64k<5.8.0-50.56
5.8.0-50.56
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-5.8.0-50-generic-lpae<5.8.0-50.56
5.8.0-50.56
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-5.8.0-50-lowlatency<5.8.0-50.56
5.8.0-50.56
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-aws<5.8.0.1030.32
5.8.0.1030.32
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-azure<5.8.0.1029.29
5.8.0.1029.29
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-gcp<5.8.0.1028.28
5.8.0.1028.28
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-generic<5.8.0.50.55
5.8.0.50.55
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-generic-64k<5.8.0.50.55
5.8.0.50.55
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-generic-lpae<5.8.0.50.55
5.8.0.50.55
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-gke<5.8.0.1028.28
5.8.0.1028.28
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-kvm<5.8.0.1024.26
5.8.0.1024.26
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-lowlatency<5.8.0.50.55
5.8.0.50.55
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-oem-20.04<5.8.0.50.55
5.8.0.50.55
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-oracle<5.8.0.1026.25
5.8.0.1026.25
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-raspi<5.8.0.1021.24
5.8.0.1021.24
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-raspi-nolpae<5.8.0.1021.24
5.8.0.1021.24
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-virtual<5.8.0.50.55
5.8.0.50.55
Ubuntu Ubuntu=20.10
All of
ubuntu/linux-image-5.10.0-1022-oem<5.10.0-1022.23
5.10.0-1022.23
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-5.4.0-1014-gkeop<5.4.0-1014.15
5.4.0-1014.15
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-5.4.0-1034-raspi<5.4.0-1034.37
5.4.0-1034.37
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-5.4.0-1038-kvm<5.4.0-1038.39
5.4.0-1038.39
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-5.4.0-1042-gcp<5.4.0-1042.45
5.4.0-1042.45
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-5.4.0-1043-oracle<5.4.0-1043.46
5.4.0-1043.46
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-5.4.0-1045-aws<5.4.0-1045.47
5.4.0-1045.47
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-5.4.0-1046-azure<5.4.0-1046.48
5.4.0-1046.48
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-5.4.0-72-generic<5.4.0-72.80
5.4.0-72.80
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-5.4.0-72-generic-lpae<5.4.0-72.80
5.4.0-72.80
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-5.4.0-72-lowlatency<5.4.0-72.80
5.4.0-72.80
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-5.8.0-50-generic<5.8.0-50.56~20.04.1
5.8.0-50.56~20.04.1
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-5.8.0-50-generic-64k<5.8.0-50.56~20.04.1
5.8.0-50.56~20.04.1
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-5.8.0-50-generic-lpae<5.8.0-50.56~20.04.1
5.8.0-50.56~20.04.1
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-5.8.0-50-lowlatency<5.8.0-50.56~20.04.1
5.8.0-50.56~20.04.1
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-aws<5.4.0.1045.46
5.4.0.1045.46
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-azure<5.4.0.1046.44
5.4.0.1046.44
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-gcp<5.4.0.1042.51
5.4.0.1042.51
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-generic<5.4.0.72.75
5.4.0.72.75
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-generic-64k-hwe-20.04<5.8.0.50.56~20.04.34
5.8.0.50.56~20.04.34
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-generic-hwe-20.04<5.8.0.50.56~20.04.34
5.8.0.50.56~20.04.34
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-generic-lpae<5.4.0.72.75
5.4.0.72.75
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-generic-lpae-hwe-20.04<5.8.0.50.56~20.04.34
5.8.0.50.56~20.04.34
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-gkeop<5.4.0.1014.17
5.4.0.1014.17
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-gkeop-5.4<5.4.0.1014.17
5.4.0.1014.17
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-kvm<5.4.0.1038.36
5.4.0.1038.36
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-lowlatency<5.4.0.72.75
5.4.0.72.75
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-lowlatency-hwe-20.04<5.8.0.50.56~20.04.34
5.8.0.50.56~20.04.34
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-oem<5.4.0.72.75
5.4.0.72.75
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-oem-20.04b<5.10.0.1022.23
5.10.0.1022.23
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-oem-osp1<5.4.0.72.75
5.4.0.72.75
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-oracle<5.4.0.1043.40
5.4.0.1043.40
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-raspi<5.4.0.1034.69
5.4.0.1034.69
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-raspi2<5.4.0.1034.69
5.4.0.1034.69
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-virtual<5.4.0.72.75
5.4.0.72.75
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-virtual-hwe-20.04<5.8.0.50.56~20.04.34
5.8.0.50.56~20.04.34
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-5.3.0-1039-raspi2<5.3.0-1039.41
5.3.0-1039.41
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-5.3.0-1042-gke<5.3.0-1042.45
5.3.0-1042.45
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-5.3.0-73-generic<5.3.0-73.69
5.3.0-73.69
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-5.3.0-73-lowlatency<5.3.0-73.69
5.3.0-73.69
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-5.4.0-1014-gkeop<5.4.0-1014.15~18.04.1
5.4.0-1014.15~18.04.1
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-5.4.0-1034-raspi<5.4.0-1034.37~18.04.1
5.4.0-1034.37~18.04.1
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-5.4.0-1042-gcp<5.4.0-1042.45~18.04.1
5.4.0-1042.45~18.04.1
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-5.4.0-1042-gke<5.4.0-1042.44~18.04.1
5.4.0-1042.44~18.04.1
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-5.4.0-1043-oracle<5.4.0-1043.46~18.04.1
5.4.0-1043.46~18.04.1
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-5.4.0-1045-aws<5.4.0-1045.47~18.04.1
5.4.0-1045.47~18.04.1
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-5.4.0-1046-azure<5.4.0-1046.48~18.04.1
5.4.0-1046.48~18.04.1
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-5.4.0-72-generic<5.4.0-72.80~18.04.1
5.4.0-72.80~18.04.1
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-5.4.0-72-generic-lpae<5.4.0-72.80~18.04.1
5.4.0-72.80~18.04.1
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-5.4.0-72-lowlatency<5.4.0-72.80~18.04.1
5.4.0-72.80~18.04.1
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-aws<5.4.0.1045.27
5.4.0.1045.27
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-azure<5.4.0.1046.25
5.4.0.1046.25
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-gcp<5.4.0.1042.29
5.4.0.1042.29
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-generic-hwe-18.04<5.4.0.72.80~18.04.65
5.4.0.72.80~18.04.65
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-generic-lpae-hwe-18.04<5.4.0.72.80~18.04.65
5.4.0.72.80~18.04.65
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-gke-5.3<5.3.0.1042.25
5.3.0.1042.25
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-gke-5.4<5.4.0.1042.44~18.04.8
5.4.0.1042.44~18.04.8
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-gkeop-5.3<5.3.0.73.130
5.3.0.73.130
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-gkeop-5.4<5.4.0.1014.15~18.04.15
5.4.0.1014.15~18.04.15
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-lowlatency-hwe-18.04<5.4.0.72.80~18.04.65
5.4.0.72.80~18.04.65
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-oem<5.4.0.72.80~18.04.65
5.4.0.72.80~18.04.65
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-oem-osp1<5.4.0.72.80~18.04.65
5.4.0.72.80~18.04.65
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-oracle<5.4.0.1043.46~18.04.25
5.4.0.1043.46~18.04.25
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-raspi-hwe-18.04<5.4.0.1034.36
5.4.0.1034.36
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-raspi2-hwe-18.04<5.3.0.1039.28
5.3.0.1039.28
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-snapdragon-hwe-18.04<5.4.0.72.80~18.04.65
5.4.0.72.80~18.04.65
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-virtual-hwe-18.04<5.4.0.72.80~18.04.65
5.4.0.72.80~18.04.65
Ubuntu Ubuntu=18.04

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