USN-4411-1: Linux kernel vulnerabilities

Releases

• Ubuntu 20.04 LTS

Packages

• linux - Linux kernel
• linux-aws - Linux kernel for Amazon Web Services (AWS) systems
• linux-azure - Linux kernel for Microsoft Azure Cloud systems
• linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
• linux-kvm - Linux kernel for cloud environments
• linux-oracle - Linux kernel for Oracle Cloud systems
• linux-raspi - Linux kernel for Raspberry Pi (V8) systems
• linux-riscv - Linux kernel for RISC-V systems

Details

It was discovered that the elf handling code in the Linux kernel did not
initialize memory before using it in certain situations. A local attacker
could use this to possibly expose sensitive information (kernel memory).
(CVE-2020-10732)

Matthew Sheets discovered that the SELinux network label handling
implementation in the Linux kernel could be coerced into de-referencing a
NULL pointer. A remote attacker could use this to cause a denial of service
(system crash). (CVE-2020-10711)

It was discovered that the SCSI generic (sg) driver in the Linux kernel did
not properly handle certain error conditions correctly. A local privileged
attacker could use this to cause a denial of service (system crash).
(CVE-2020-12770)

It was discovered that the USB Gadget device driver in the Linux kernel did
not validate arguments passed from configfs in some situations. A local
attacker could possibly use this to cause a denial of service (system
crash) or possibly expose sensitive information. (CVE-2020-13143)

It was discovered that the KVM implementation in the Linux kernel did not
properly deallocate memory on initialization for some processors. A local
attacker could possibly use this to cause a denial of service.
(CVE-2020-12768)

Update instructions

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

Ubuntu 20.04

• linux-image-5.4.0-1013-raspi - 5.4.0-1013.13
• linux-image-5.4.0-1018-aws - 5.4.0-1018.18
• linux-image-5.4.0-1019-gcp - 5.4.0-1019.19
• linux-image-5.4.0-1019-oracle - 5.4.0-1019.19
• linux-image-5.4.0-1020-azure - 5.4.0-1020.20
• linux-image-5.4.0-28-generic - 5.4.0-28.32
• linux-image-5.4.0-40-generic - 5.4.0-40.44
• linux-image-5.4.0-40-generic-lpae - 5.4.0-40.44
• linux-image-5.4.0-40-lowlatency - 5.4.0-40.44
• linux-image-aws - 5.4.0.1018.19
• linux-image-azure - 5.4.0.1020.19
• linux-image-gcp - 5.4.0.1019.17
• linux-image-generic - 5.4.0.40.43
• linux-image-generic-lpae - 5.4.0.40.43
• linux-image-gke - 5.4.0.1019.17
• linux-image-kvm - 5.4.0.1018.17
• linux-image-lowlatency - 5.4.0.40.43
• linux-image-oem - 5.4.0.40.43
• linux-image-oem-osp1 - 5.4.0.40.43
• linux-image-oracle - 5.4.0.1019.17
• linux-image-raspi - 5.4.0.1013.13
• linux-image-raspi2 - 5.4.0.1013.13
• linux-image-virtual - 5.4.0.40.43

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-2020-13143
• CVE-2020-12768
• CVE-2020-10711
• CVE-2020-10732
• CVE-2020-12770

Related notices

• USN-4412-1: linux-image-kvm, linux-image-snapdragon-hwe-18.04, linux, linux-image-5.3.0-62-lowlatency, linux-image-gkeop-5.3, linux-image-5.3.0-1030-gcp, linux-image-lowlatency-hwe-18.04, linux-image-5.3.0-1028-raspi2, linux-image-generic-hwe-18.04, linux-image-5.3.0-1024-kvm, linux-gke-5.3, linux-image-raspi2-hwe-18.04, linux-image-5.3.0-1030-gke, linux-azure, linux-image-5.3.0-1032-azure, linux-image-lowlatency, linux-raspi2-5.3, linux-image-snapdragon, linux-image-virtual-hwe-18.04, linux-image-5.3.0-1028-oracle, linux-image-generic-lpae, linux-image-5.3.0-62-generic-lpae, linux-image-5.3.0-62-generic, linux-gcp-5.3, linux-oracle-5.3, linux-image-azure, linux-image-gke-5.3, linux-image-5.3.0-62-snapdragon, linux-gcp, linux-image-generic, linux-image-oracle, linux-image-gcp, linux-image-generic-lpae-hwe-18.04, linux-image-virtual, linux-aws-5.3, linux-image-aws, linux-hwe, linux-kvm, linux-image-5.3.0-1030-aws, linux-aws, linux-image-gke, linux-oracle, linux-azure-5.3
• USN-4413-1: linux-image-oem-osp1, linux-image-5.0.0-1043-gke, linux-oem-osp1, linux-image-gke-5.0, linux-gke-5.0, linux-image-5.0.0-1063-oem-osp1
• USN-4414-1: linux-image-kvm, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-107-generic, linux, linux-image-4.15.0-109-lowlatency, linux-image-4.15.0-1064-gke, linux-image-virtual-hwe-16.04, linux-image-generic-hwe-16.04, linux-aws-hwe, linux-image-lowlatency-hwe-16.04, linux-raspi2, linux-image-gcp-lts-18.04, linux-image-4.15.0-1081-snapdragon, linux-gke-4.15, linux-image-azure-edge, linux-image-azure-lts-18.04, linux-azure, linux-image-4.15.0-107-generic-lpae, linux-image-lowlatency, linux-snapdragon, linux-image-snapdragon, linux-image-generic-lpae, linux-image-4.15.0-1091-azure, linux-image-generic-hwe-16.04-edge, linux-image-4.15.0-1078-gcp, linux-image-azure, linux-image-oracle-lts-18.04, linux-gcp-4.15, linux-image-4.15.0-1074-aws, linux-image-4.15.0-1077-aws, linux-image-4.15.0-1046-oracle, linux-gcp, linux-image-4.15.0-109-generic, linux-image-gke-4.15, linux-image-generic, linux-azure-4.15, linux-image-oem, linux-image-4.15.0-107-lowlatency, linux-image-raspi2, linux-image-oracle, linux-image-gcp, linux-image-lowlatency-hwe-16.04-edge, linux-image-aws-lts-18.04, linux-image-virtual, linux-image-virtual-hwe-16.04-edge, linux-image-4.15.0-1065-raspi2, linux-image-generic-lpae-hwe-16.04-edge, linux-hwe, linux-image-4.15.0-1091-oem, linux-kvm, linux-aws, linux-image-4.15.0-1048-oracle, linux-image-aws-hwe, linux-image-gke, linux-image-4.15.0-1069-kvm, linux-oem, linux-oracle, linux-image-4.15.0-109-generic-lpae
• USN-4419-1: linux-image-4.4.0-185-lowlatency, linux-image-kvm, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc64-smp, linux-image-virtual-lts-vivid, linux, linux-image-4.4.0-185-powerpc64-smp, linux-image-generic-lpae-lts-vivid, linux-image-powerpc-e500mc-lts-utopic, linux-image-4.4.0-1074-aws, linux-image-powerpc-smp-lts-wily, linux-image-4.4.0-1139-snapdragon, linux-image-powerpc64-emb-lts-utopic, linux-image-virtual-lts-utopic, linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-1135-raspi2, linux-image-powerpc-e500mc-lts-wily, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc64-smp-lts-wily, linux-raspi2, linux-image-powerpc-smp-lts-vivid, linux-image-lowlatency-lts-xenial, linux-image-lowlatency-lts-wily, linux-image-powerpc-e500mc, linux-snapdragon, linux-image-lowlatency, linux-image-4.4.0-185-generic, linux-image-powerpc-smp, linux-image-snapdragon, linux-image-generic-lpae, linux-lts-xenial, linux-image-powerpc64-smp-lts-vivid, linux-image-4.4.0-185-powerpc-smp, linux-image-generic-lts-vivid, linux-image-generic-lpae-lts-utopic, linux-image-4.4.0-185-powerpc-e500mc, linux-image-powerpc-e500mc-lts-xenial, linux-image-virtual-lts-xenial, linux-image-4.4.0-185-powerpc64-emb, linux-image-generic-lts-utopic, linux-image-generic-lpae-lts-wily, linux-image-4.4.0-1110-aws, linux-image-lowlatency-lts-utopic, linux-image-generic, linux-image-lowlatency-lts-vivid, linux-image-powerpc64-emb-lts-wily, linux-image-raspi2, linux-image-powerpc-smp-lts-utopic, linux-image-virtual, linux-image-4.4.0-185-generic-lpae, linux-image-aws, linux-image-4.4.0-1076-kvm, linux-image-powerpc-smp-lts-xenial, linux-kvm, linux-aws, linux-image-generic-lts-wily, linux-image-powerpc64-emb-lts-vivid, linux-image-powerpc64-smp-lts-utopic, linux-image-powerpc64-emb, linux-image-generic-lpae-lts-xenial, linux-image-generic-lts-xenial, linux-image-virtual-lts-wily
• USN-4427-1: linux-image-kvm, linux-image-powerpc-e500mc-lts-vivid, linux-image-virtual-lts-vivid, linux-image-powerpc64-smp, linux-image-4.4.0-186-generic-lpae, linux, linux-image-4.4.0-186-lowlatency, linux-image-generic-lpae-lts-vivid, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc-smp-lts-wily, linux-image-powerpc64-emb-lts-utopic, linux-image-virtual-lts-utopic, linux-image-4.4.0-186-generic, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc64-smp-lts-wily, linux-image-powerpc-e500mc-lts-wily, linux-image-powerpc64-emb-lts-xenial, linux-raspi2, linux-image-4.4.0-186-powerpc-smp, linux-image-4.4.0-186-powerpc64-emb, linux-image-lowlatency-lts-xenial, linux-image-powerpc-smp-lts-vivid, linux-image-lowlatency-lts-wily, linux-image-powerpc-e500mc, linux-snapdragon, linux-image-lowlatency, linux-image-snapdragon, linux-image-powerpc-smp, linux-lts-xenial, linux-image-generic-lpae, linux-image-powerpc64-smp-lts-vivid, linux-image-generic-lts-vivid, linux-image-generic-lpae-lts-utopic, linux-image-virtual-lts-xenial, linux-image-4.4.0-186-powerpc-e500mc, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-1111-aws, linux-image-4.4.0-1136-raspi2, linux-image-generic-lts-utopic, linux-image-generic-lpae-lts-wily, linux-image-4.4.0-186-powerpc64-smp, linux-image-lowlatency-lts-utopic, linux-image-generic, linux-image-lowlatency-lts-vivid, linux-image-powerpc64-emb-lts-wily, linux-image-raspi2, linux-image-powerpc-smp-lts-utopic, linux-image-virtual, linux-image-aws, linux-image-powerpc-smp-lts-xenial, linux-kvm, linux-aws, linux-image-generic-lts-wily, linux-image-powerpc64-emb-lts-vivid, linux-image-4.4.0-1077-kvm, linux-image-4.4.0-1075-aws, linux-image-powerpc64-smp-lts-utopic, linux-image-powerpc64-emb, linux-image-generic-lpae-lts-xenial, linux-image-generic-lts-xenial, linux-image-4.4.0-1140-snapdragon, linux-image-virtual-lts-wily
• USN-4439-1: linux-image-oem-osp1, linux-image-5.0.0-1065-oem-osp1, linux-oem-osp1, linux-image-gke-5.0, linux-gke-5.0, linux-image-5.0.0-1045-gke
• USN-4440-1: linux-image-5.3.0-1030-oracle, linux-image-5.3.0-1032-gcp, linux-image-5.3.0-1030-raspi2, linux-image-gkeop-5.3, linux-gke-5.3, linux-image-5.3.0-1034-azure, linux-image-5.3.0-64-generic, linux-image-raspi2-hwe-18.04, linux-raspi2-5.3, linux-image-5.3.0-64-generic-lpae, linux-gcp-5.3, linux-oracle-5.3, linux-image-azure, linux-image-5.3.0-1032-aws, linux-image-gke-5.3, linux-image-oracle, linux-image-gcp, linux-image-5.3.0-64-lowlatency, linux-aws-5.3, linux-image-5.3.0-1032-gke, linux-image-aws, linux-hwe, linux-azure-5.3
• USN-4485-1: linux-image-kvm, linux-image-generic-lpae-hwe-16.04, linux, linux-image-4.15.0-1080-aws, linux-image-virtual-hwe-16.04, linux-image-4.15.0-1068-raspi2, linux-image-generic-hwe-16.04, linux-aws-hwe, linux-image-lowlatency-hwe-16.04, linux-raspi2, linux-image-gcp-lts-18.04, linux-image-azure-edge, linux-gke-4.15, linux-image-azure-lts-18.04, linux-snapdragon, linux-azure, linux-image-lowlatency, linux-image-4.15.0-1094-oem, linux-image-snapdragon, linux-image-generic-lpae, linux-image-generic-hwe-16.04-edge, linux-image-4.15.0-1051-oracle, linux-image-azure, linux-image-oracle-lts-18.04, linux-gcp-4.15, linux-image-4.15.0-1093-azure, linux-gcp, linux-image-gke-4.15, linux-image-generic, linux-image-4.15.0-115-generic-lpae, linux-azure-4.15, linux-image-4.15.0-1081-gcp, linux-image-oem, linux-image-raspi2, linux-image-4.15.0-1084-snapdragon, linux-image-oracle, linux-image-gcp, linux-image-lowlatency-hwe-16.04-edge, linux-image-aws-lts-18.04, linux-image-4.15.0-1067-gke, linux-image-virtual, linux-image-virtual-hwe-16.04-edge, linux-image-4.15.0-115-lowlatency, linux-image-generic-lpae-hwe-16.04-edge, linux-hwe, linux-image-4.15.0-115-generic, linux-kvm, linux-aws, linux-image-4.15.0-1072-kvm, linux-image-aws-hwe, linux-image-gke, linux-oem, linux-oracle