USN-4419-1: Linux kernel vulnerabilities

Releases

• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• linux - Linux kernel
• linux-aws - Linux kernel for Amazon Web Services (AWS) systems
• linux-kvm - Linux kernel for cloud environments
• linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty
• linux-raspi2 - Linux kernel for Raspberry Pi (V7) systems
• linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors

Details

It was discovered that a race condition existed in the Precision Time
Protocol (PTP) implementation in the Linux kernel, leading to a use-after-
free vulnerability. A local attacker could possibly use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2020-10690)

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)

Shijie Luo discovered that the ext4 file system implementation in the Linux
kernel did not properly check for a too-large journal size. An attacker
could use this to construct a malicious ext4 image that, when mounted,
could cause a denial of service (soft lockup). (CVE-2020-8992)

Update instructions

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

Ubuntu 16.04

• linux-image-4.4.0-1076-kvm - 4.4.0-1076.83
• linux-image-4.4.0-1110-aws - 4.4.0-1110.121
• linux-image-4.4.0-1135-raspi2 - 4.4.0-1135.144
• linux-image-4.4.0-1139-snapdragon - 4.4.0-1139.147
• linux-image-4.4.0-185-generic - 4.4.0-185.215
• linux-image-4.4.0-185-generic-lpae - 4.4.0-185.215
• linux-image-4.4.0-185-lowlatency - 4.4.0-185.215
• linux-image-4.4.0-185-powerpc-e500mc - 4.4.0-185.215
• linux-image-4.4.0-185-powerpc-smp - 4.4.0-185.215
• linux-image-4.4.0-185-powerpc64-emb - 4.4.0-185.215
• linux-image-4.4.0-185-powerpc64-smp - 4.4.0-185.215
• linux-image-aws - 4.4.0.1110.114
• linux-image-generic - 4.4.0.185.191
• linux-image-generic-lpae - 4.4.0.185.191
• linux-image-kvm - 4.4.0.1076.74
• linux-image-lowlatency - 4.4.0.185.191
• linux-image-powerpc-e500mc - 4.4.0.185.191
• linux-image-powerpc-smp - 4.4.0.185.191
• linux-image-powerpc64-emb - 4.4.0.185.191
• linux-image-powerpc64-smp - 4.4.0.185.191
• linux-image-raspi2 - 4.4.0.1135.135
• linux-image-snapdragon - 4.4.0.1139.131
• linux-image-virtual - 4.4.0.185.191

Ubuntu 14.04

• linux-image-4.4.0-1074-aws - 4.4.0-1074.78
• linux-image-4.4.0-185-generic - 4.4.0-185.215~14.04.1
• linux-image-4.4.0-185-generic-lpae - 4.4.0-185.215~14.04.1
• linux-image-4.4.0-185-lowlatency - 4.4.0-185.215~14.04.1
• linux-image-4.4.0-185-powerpc-e500mc - 4.4.0-185.215~14.04.1
• linux-image-4.4.0-185-powerpc-smp - 4.4.0-185.215~14.04.1
• linux-image-4.4.0-185-powerpc64-emb - 4.4.0-185.215~14.04.1
• linux-image-4.4.0-185-powerpc64-smp - 4.4.0-185.215~14.04.1
• linux-image-aws - 4.4.0.1074.71
• linux-image-generic-lpae-lts-xenial - 4.4.0.185.162
• linux-image-generic-lts-xenial - 4.4.0.185.162
• linux-image-lowlatency-lts-xenial - 4.4.0.185.162
• linux-image-powerpc-e500mc-lts-xenial - 4.4.0.185.162
• linux-image-powerpc-smp-lts-xenial - 4.4.0.185.162
• linux-image-powerpc64-emb-lts-xenial - 4.4.0.185.162
• linux-image-powerpc64-smp-lts-xenial - 4.4.0.185.162
• linux-image-virtual-lts-xenial - 4.4.0.185.162

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-2020-10690
• CVE-2020-10711
• CVE-2020-12770
• CVE-2020-13143
• CVE-2020-8992

Related notices

• USN-4411-1: linux-image-5.4.0-1013-raspi, linux-image-kvm, linux-image-5.4.0-40-lowlatency, linux-riscv, linux-image-generic-hwe-18.04-edge, linux-image-generic-lpae, linux-image-generic-hwe-18.04, linux-image-generic-lpae-hwe-18.04, linux-azure, linux-image-5.4.0-1019-gcp, linux-image-virtual, linux-image-lowlatency-hwe-18.04-edge, linux-image-lowlatency-hwe-20.04, linux-image-5.4.0-28-generic, linux-image-oem-osp1, linux-image-oracle, linux-oracle, linux-gcp, linux-image-generic-hwe-20.04, linux, linux-image-virtual-hwe-20.04, linux-image-azure, linux-image-5.4.0-1018-aws, linux-image-aws, linux-kvm, linux-image-generic-lpae-hwe-18.04-edge, linux-image-raspi2, linux-image-lowlatency, linux-image-5.4.0-40-generic-lpae, linux-image-gcp, linux-aws, linux-image-5.4.0-1019-oracle, linux-image-generic, linux-image-gke, linux-image-5.4.0-40-generic, linux-image-lowlatency-hwe-18.04, linux-image-5.4.0-1020-azure, linux-raspi, linux-image-generic-lpae-hwe-20.04, linux-image-raspi, linux-image-oem, linux-image-virtual-hwe-18.04-edge, linux-image-virtual-hwe-18.04
• USN-4412-1: linux-image-kvm, linux-azure-5.3, linux-hwe, linux-gke-5.3, linux-image-generic-lpae, linux-image-generic-hwe-18.04, linux-image-5.3.0-62-snapdragon, linux-image-raspi2-hwe-18.04, linux-gcp-5.3, linux-image-generic-lpae-hwe-18.04, linux-azure, linux-image-virtual, linux-image-oracle, linux-image-5.3.0-1028-oracle, linux-oracle, linux-image-5.3.0-1032-azure, linux-gcp, linux-image-5.3.0-62-lowlatency, linux-image-5.3.0-1024-kvm, linux-image-5.3.0-1030-gke, linux, linux-image-azure, linux-kvm, linux-image-aws, linux-image-5.3.0-62-generic, linux-image-lowlatency, linux-image-snapdragon-hwe-18.04, linux-image-5.3.0-1030-gcp, linux-aws, linux-image-5.3.0-62-generic-lpae, linux-image-gcp, linux-oracle-5.3, linux-image-generic, linux-image-snapdragon, linux-image-gke, linux-raspi2-5.3, linux-image-lowlatency-hwe-18.04, linux-aws-5.3, linux-image-gke-5.3, linux-image-5.3.0-1028-raspi2, linux-image-gkeop-5.3, linux-image-5.3.0-1030-aws, linux-image-virtual-hwe-18.04
• USN-4413-1: linux-gke-5.0, linux-image-5.0.0-1063-oem-osp1, linux-oem-osp1, linux-image-5.0.0-1043-gke, linux-image-oem-osp1, linux-image-gke-5.0
• USN-4414-1: linux-image-generic-hwe-16.04, linux-image-kvm, linux-hwe, linux-image-4.15.0-1074-aws, linux-image-aws-hwe, linux-image-4.15.0-1081-snapdragon, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-1065-raspi2, linux-image-4.15.0-109-generic, linux-image-generic-lpae, linux-image-virtual-hwe-16.04, linux-image-4.15.0-109-generic-lpae, linux-oem, linux-image-4.15.0-107-generic-lpae, linux-image-generic-lpae-hwe-16.04-edge, linux-raspi2, linux-azure, linux-image-virtual, linux-image-4.15.0-1091-oem, linux-image-4.15.0-1091-azure, linux-image-oracle, linux-oracle, linux-image-4.15.0-107-lowlatency, linux-gcp, linux-azure-4.15, linux, linux-image-azure, linux-kvm, linux-image-aws-lts-18.04, linux-snapdragon, linux-image-gke-4.15, linux-image-raspi2, linux-image-oracle-lts-18.04, linux-image-4.15.0-107-generic, linux-image-lowlatency, linux-image-4.15.0-1078-gcp, linux-image-4.15.0-1064-gke, linux-image-4.15.0-1048-oracle, linux-gke-4.15, linux-aws-hwe, linux-aws, linux-image-gcp, linux-image-generic, linux-image-snapdragon, linux-image-lowlatency-hwe-16.04, linux-image-gke, linux-image-4.15.0-109-lowlatency, linux-image-4.15.0-1077-aws, linux-image-generic-hwe-16.04-edge, linux-image-gcp-lts-18.04, linux-image-azure-edge, linux-gcp-4.15, linux-image-4.15.0-1069-kvm, linux-image-lowlatency-hwe-16.04-edge, linux-image-4.15.0-1046-oracle, linux-image-oem, linux-image-virtual-hwe-16.04-edge, linux-image-azure-lts-18.04
• USN-4344-1: linux-gke-5.0, linux-image-5.0.0-1050-oem-osp1, linux-oem-osp1, linux-image-5.0.0-1035-gke, linux-image-oem-osp1, linux-image-gke-5.0
• USN-4342-1: linux-image-kvm, linux-azure-5.3, linux-hwe, linux-image-5.3.0-1023-raspi2, linux-gke-5.3, linux-image-generic-hwe-18.04-edge, linux-image-generic-lpae, linux-image-generic-hwe-18.04, linux-image-raspi2-hwe-18.04, linux-gcp-5.3, linux-image-generic-lpae-hwe-18.04, linux-raspi2, linux-azure, linux-image-virtual, linux-image-5.3.0-1016-kvm, linux-image-lowlatency-hwe-18.04-edge, linux-image-5.3.0-1017-aws, linux-image-snapdragon-hwe-18.04-edge, linux-image-oracle, linux-oracle, linux-gcp, linux-image-5.3.0-1016-oracle, linux, linux-image-5.3.0-51-generic-lpae, linux-image-azure, linux-kvm, linux-image-aws, linux-image-5.3.0-1018-gke, linux-image-5.3.0-51-snapdragon, linux-image-gcp-edge, linux-image-5.3.0-1020-azure, linux-image-generic-lpae-hwe-18.04-edge, linux-image-raspi2, linux-image-lowlatency, linux-image-snapdragon-hwe-18.04, linux-aws, linux-image-gcp, linux-oracle-5.3, linux-image-generic, linux-image-snapdragon, linux-image-gke, linux-raspi2-5.3, linux-image-lowlatency-hwe-18.04, linux-image-5.3.0-51-lowlatency, linux-image-gke-5.3, linux-image-azure-edge, linux-image-5.3.0-51-generic, linux-image-oracle-edge, linux-image-5.3.0-1018-gcp, linux-image-virtual-hwe-18.04-edge, linux-image-virtual-hwe-18.04
• USN-4324-1: linux-image-kvm, linux-image-aws-hwe, linux-image-4.15.0-1037-oracle, linux-image-4.15.0-1065-aws, linux-image-4.15.0-1060-gcp, linux-image-4.15.0-1060-raspi2, linux-oem, linux-raspi2, linux-azure, linux-image-4.15.0-1079-oem, linux-image-oracle, linux-oracle, linux-gcp, linux-image-4.15.0-1076-snapdragon, linux-image-azure, linux-image-aws, linux-image-aws-lts-18.04, linux-kvm, linux-snapdragon, linux-image-gke-4.15, linux-image-raspi2, linux-image-oracle-lts-18.04, linux-gke-4.15, linux-aws-hwe, linux-aws, linux-image-gcp, linux-image-snapdragon, linux-image-gke, linux-image-azure-edge, linux-image-4.15.0-1058-kvm, linux-image-oem, linux-image-4.15.0-1057-gke, linux-image-4.15.0-1077-azure
• USN-4318-1: linux-image-lowlatency-hwe-16.04, linux-image-virtual, linux-image-generic-hwe-16.04, linux-image-generic-hwe-16.04-edge, linux-hwe, linux-image-generic-lpae-hwe-16.04, linux-image-lowlatency, linux-image-4.15.0-96-generic-lpae, linux-image-virtual-hwe-16.04, linux-image-generic-lpae, linux-image-4.15.0-96-generic, linux-image-lowlatency-hwe-16.04-edge, linux-image-4.15.0-96-lowlatency, linux-image-oem, linux-image-virtual-hwe-16.04-edge, linux-image-generic-lpae-hwe-16.04-edge, linux-image-generic, linux