USN-4907-1: Linux kernel vulnerabilities

Releases

• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• linux - Linux kernel
• linux-aws - Linux kernel for Amazon Web Services (AWS) systems
• linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
• linux-azure - Linux kernel for Microsoft Azure Cloud systems
• linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems
• linux-dell300x - Linux kernel for Dell 300x platforms
• linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
• linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
• linux-kvm - Linux kernel for cloud environments
• linux-oracle - Linux kernel for Oracle Cloud systems
• linux-raspi2 - Linux kernel for Raspberry Pi (V8) systems
• linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors

Details

Wen Xu discovered that the xfs file system implementation in the Linux
kernel did not properly validate the number of extents in an inode. An
attacker could use this to construct a malicious xfs image that, when
mounted, could cause a denial of service (system crash). (CVE-2018-13095)

It was discovered that the priority inheritance futex implementation in the
Linux kernel contained a race condition, leading to a use-after-free
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2021-3347)

It was discovered that the network block device (nbd) driver in the Linux
kernel contained a use-after-free vulnerability during device setup. A
local attacker with access to the nbd device could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2021-3348)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.04

• linux-image-4.15.0-1016-dell300x - 4.15.0-1016.20
• linux-image-4.15.0-1069-oracle - 4.15.0-1069.77
• linux-image-4.15.0-1083-raspi2 - 4.15.0-1083.88
• linux-image-4.15.0-1089-kvm - 4.15.0-1089.91
• linux-image-4.15.0-1097-gcp - 4.15.0-1097.110
• linux-image-4.15.0-1098-aws - 4.15.0-1098.105
• linux-image-4.15.0-1100-snapdragon - 4.15.0-1100.109
• linux-image-4.15.0-1112-azure - 4.15.0-1112.125
• linux-image-4.15.0-141-generic - 4.15.0-141.145
• linux-image-4.15.0-141-generic-lpae - 4.15.0-141.145
• linux-image-4.15.0-141-lowlatency - 4.15.0-141.145
• linux-image-aws-lts-18.04 - 4.15.0.1098.101
• linux-image-azure-lts-18.04 - 4.15.0.1112.85
• linux-image-dell300x - 4.15.0.1016.18
• linux-image-gcp-lts-18.04 - 4.15.0.1097.115
• linux-image-generic - 4.15.0.141.128
• linux-image-generic-lpae - 4.15.0.141.128
• linux-image-kvm - 4.15.0.1089.85
• linux-image-lowlatency - 4.15.0.141.128
• linux-image-oracle-lts-18.04 - 4.15.0.1069.79
• linux-image-raspi2 - 4.15.0.1083.80
• linux-image-snapdragon - 4.15.0.1100.103
• linux-image-virtual - 4.15.0.141.128

Ubuntu 16.04

• linux-image-4.15.0-1069-oracle - 4.15.0-1069.77~16.04.1
• linux-image-4.15.0-1097-gcp - 4.15.0-1097.110~16.04.1
• linux-image-4.15.0-1098-aws - 4.15.0-1098.105~16.04.1
• linux-image-4.15.0-1112-azure - 4.15.0-1112.124~16.04.1
• linux-image-aws-hwe - 4.15.0.1098.91
• linux-image-azure - 4.15.0.1112.103
• linux-image-gcp - 4.15.0.1097.98
• linux-image-gke - 4.15.0.1097.98
• linux-image-oracle - 4.15.0.1069.57

Ubuntu 14.04

• linux-image-4.15.0-1112-azure - 4.15.0-1112.124~14.04.1
• linux-image-azure - 4.15.0.1112.85

After a standard system update you need to reboot your computer to make
all the necessary changes.

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.

References

• CVE-2021-3347
• CVE-2021-3348
• CVE-2018-13095

Related notices

• USN-4878-1: linux-image-gcp, linux-image-5.4.0-1039-aws, linux-aws-5.4, linux-image-5.4.0-67-generic, linux-image-snapdragon-hwe-18.04-edge, linux-image-snapdragon-hwe-18.04, linux-image-generic-hwe-18.04-edge, linux-image-raspi2-hwe-18.04, linux-image-5.4.0-1011-gkeop, linux, linux-image-lowlatency, linux-image-lowlatency-hwe-18.04-edge, linux-image-raspi-hwe-18.04-edge, linux-image-azure, linux-image-lowlatency-hwe-18.04, linux-image-azure-edge, linux-image-virtual-hwe-18.04-edge, linux-oracle, linux-image-generic, linux-image-virtual-hwe-18.04, linux-image-5.4.0-1034-kvm, linux-image-gkeop, linux-image-5.4.0-1041-azure, linux-raspi, linux-image-generic-lpae, linux-image-oem, linux-azure, linux-image-5.4.0-1039-oracle, linux-image-gke-5.4, linux-gkeop-5.4, linux-image-aws-edge, linux-raspi-5.4, linux-image-aws, linux-image-5.4.0-1038-gcp, linux-image-raspi, linux-hwe-5.4, linux-image-raspi2, linux-image-kvm, linux-gcp, linux-image-5.4.0-67-lowlatency, linux-image-raspi-hwe-18.04, linux-aws, linux-image-5.4.0-1037-gke, linux-gkeop, linux-image-generic-hwe-18.04, linux-gke-5.4, linux-oracle-5.4, linux-azure-5.4, linux-image-gkeop-5.4, linux-image-raspi2-hwe-18.04-edge, linux-image-oem-osp1, linux-image-oracle, linux-image-5.4.0-1030-raspi, linux-image-gcp-edge, linux-image-generic-lpae-hwe-18.04, linux-image-virtual, linux-image-generic-lpae-hwe-18.04-edge, linux-kvm, linux-gcp-5.4, linux-image-5.4.0-67-generic-lpae, linux-image-oracle-edge
• USN-4884-1: linux-image-oem-20.04-edge, linux-image-oem-20.04b, linux-image-5.10.0-1017-oem, linux-oem-5.10
• USN-4910-1: linux-image-lowlatency-hwe-20.04-edge, linux-image-5.8.0-49-generic-lpae, linux-image-gcp, linux-image-generic-64k-hwe-20.04-edge, linux-image-5.8.0-49-generic-64k, linux-image-generic-64k, linux-image-gke, linux-image-lowlatency-hwe-20.04, linux-hwe-5.8, linux, linux-image-lowlatency, linux-image-azure, linux-kvm, linux-image-virtual-hwe-20.04, linux-oracle, linux-image-generic, linux-image-5.8.0-1027-gcp, linux-image-5.8.0-1020-raspi-nolpae, linux-image-generic-64k-hwe-20.04, linux-raspi, linux-image-generic-lpae, linux-azure, linux-image-5.8.0-1025-oracle, linux-image-5.8.0-49-lowlatency, linux-image-5.8.0-1028-aws, linux-image-aws, linux-image-5.8.0-1020-raspi, linux-image-generic-hwe-20.04-edge, linux-image-raspi, linux-image-generic-lpae-hwe-20.04-edge, linux-image-5.8.0-1027-azure, linux-image-virtual-hwe-20.04-edge, linux-image-5.8.0-1023-kvm, linux-gcp, linux-image-kvm, linux-image-oem-20.04, linux-aws, linux-image-generic-hwe-20.04, linux-image-oracle, linux-image-virtual, linux-image-raspi-nolpae, linux-image-generic-lpae-hwe-20.04, linux-image-5.8.0-49-generic
• USN-4909-1: linux-image-5.4.0-1033-raspi, linux-image-gcp, linux-aws-5.4, linux-image-snapdragon-hwe-18.04-edge, linux-image-5.4.0-1042-oracle, linux-image-snapdragon-hwe-18.04, linux-image-generic-hwe-18.04-edge, linux-image-raspi2-hwe-18.04, linux, linux-image-lowlatency, linux-image-5.4.0-1040-gke, linux-image-lowlatency-hwe-18.04-edge, linux-image-raspi-hwe-18.04-edge, linux-image-azure, linux-image-lowlatency-hwe-18.04, linux-image-azure-edge, linux-image-virtual-hwe-18.04-edge, linux-oracle, linux-image-generic, linux-image-virtual-hwe-18.04, linux-image-gkeop, linux-image-5.4.0-1041-gcp, linux-image-5.4.0-1044-azure, linux-image-5.4.0-71-lowlatency, linux-image-generic-lpae, linux-image-oem, linux-raspi, linux-azure, linux-image-gke-5.4, linux-gkeop-5.4, linux-gcp-5.4, linux-image-aws-edge, linux-raspi-5.4, linux-image-aws, linux-image-raspi, linux-hwe-5.4, linux-image-raspi2, linux-image-kvm, linux-gcp, linux-image-raspi-hwe-18.04, linux-aws, linux-image-5.4.0-71-generic, linux-gkeop, linux-image-generic-hwe-18.04, linux-gke-5.4, linux-oracle-5.4, linux-azure-5.4, linux-image-gkeop-5.4, linux-image-raspi2-hwe-18.04-edge, linux-image-oem-osp1, linux-image-oracle, linux-image-5.4.0-1043-aws, linux-image-5.4.0-1037-kvm, linux-image-5.4.0-71-generic-lpae, linux-image-gcp-edge, linux-image-generic-lpae-hwe-18.04, linux-image-virtual, linux-image-generic-lpae-hwe-18.04-edge, linux-kvm, linux-image-5.4.0-1013-gkeop, linux-image-oracle-edge
• USN-4904-1: linux-image-generic-lts-utopic, linux-image-generic-lts-xenial, linux-image-4.4.0-208-generic, linux-snapdragon, linux-image-4.4.0-208-generic-lpae, linux-image-virtual-lts-wily, linux-image-4.4.0-1126-aws, linux-image-generic-lts-vivid, linux, linux-image-lowlatency, linux-image-4.4.0-208-powerpc-e500mc, linux-image-generic-lts-wily, linux-image-powerpc-e500mc, linux-image-powerpc64-emb-lts-vivid, linux-image-virtual-lts-utopic, linux-image-generic-lpae-lts-utopic, linux-image-powerpc64-emb-lts-wily, linux-image-generic-lpae-lts-xenial, linux-kvm, linux-image-generic, linux-image-4.4.0-1154-snapdragon, linux-image-powerpc-e500mc-lts-wily, linux-image-lowlatency-lts-xenial, linux-image-powerpc64-emb, linux-image-powerpc64-emb-lts-utopic, linux-image-powerpc-smp-lts-xenial, linux-image-powerpc-smp-lts-wily, linux-image-generic-lpae, linux-image-4.4.0-1150-raspi2, linux-image-4.4.0-1091-kvm, linux-image-snapdragon, linux-image-lowlatency-lts-wily, linux-image-powerpc-e500mc-lts-vivid, linux-lts-xenial, linux-image-generic-lpae-lts-vivid, linux-image-aws, linux-image-lowlatency-lts-utopic, linux-image-4.4.0-208-lowlatency, linux-image-raspi2, linux-image-4.4.0-208-powerpc64-smp, linux-image-powerpc-e500mc-lts-utopic, linux-image-kvm, linux-image-powerpc-smp-lts-vivid, linux-image-powerpc64-smp-lts-vivid, linux-image-4.4.0-208-powerpc-smp, linux-aws, linux-image-powerpc64-smp-lts-wily, linux-image-powerpc64-smp, linux-image-lowlatency-lts-vivid, linux-image-4.4.0-1090-aws, linux-image-4.4.0-208-powerpc64-emb, linux-image-powerpc-e500mc-lts-xenial, linux-image-virtual-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc-smp, linux-image-generic-lpae-lts-wily, linux-raspi2, linux-image-virtual, linux-image-virtual-lts-vivid, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc-smp-lts-utopic, linux-image-powerpc64-smp-lts-utopic