USN-4069-1: Linux kernel vulnerabilities

Releases

• Ubuntu 19.04

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-raspi2 - Linux kernel for Raspberry Pi 2
• linux-snapdragon - Linux kernel for Snapdragon processors

Details

It was discovered that an integer overflow existed in the Linux kernel when
reference counting pages, leading to potential use-after-free issues. A
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2019-11487)

Jann Horn discovered that a race condition existed in the Linux kernel when
performing core dumps. A local attacker could use this to cause a denial of
service (system crash) or expose sensitive information. (CVE-2019-11599)

It was discovered that the ext4 file system implementation in the Linux
kernel did not properly zero out memory in some situations. A local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2019-11833)

It was discovered that the Bluetooth Human Interface Device Protocol (HIDP)
implementation in the Linux kernel did not properly verify strings were
NULL terminated in certain situations. A local attacker could use this to
expose sensitive information (kernel memory). (CVE-2019-11884)

Update instructions

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

Ubuntu 19.04

• linux-image-gke - 5.0.0.1011.11
• linux-image-5.0.0-1017-snapdragon - 5.0.0-1017.18
• linux-image-5.0.0-21-generic - 5.0.0-21.22
• linux-image-5.0.0-1013-raspi2 - 5.0.0-1013.13
• linux-image-gcp - 5.0.0.1011.11
• linux-image-5.0.0-1012-azure - 5.0.0-1012.12
• linux-image-azure - 5.0.0.1012.11
• linux-image-5.0.0-21-generic-lpae - 5.0.0-21.22
• linux-image-generic - 5.0.0.21.22
• linux-image-virtual - 5.0.0.21.22
• linux-image-5.0.0-21-lowlatency - 5.0.0-21.22
• linux-image-raspi2 - 5.0.0.1013.10
• linux-image-aws - 5.0.0.1011.11
• linux-image-generic-lpae - 5.0.0.21.22
• linux-image-snapdragon - 5.0.0.1017.10
• linux-image-5.0.0-1011-kvm - 5.0.0-1011.12
• linux-image-kvm - 5.0.0.1011.11
• linux-image-5.0.0-1011-gcp - 5.0.0-1011.11
• linux-image-lowlatency - 5.0.0.21.22
• linux-image-5.0.0-1011-aws - 5.0.0-1011.12

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-2019-11487
• CVE-2019-11599
• CVE-2019-11833
• CVE-2019-11884

Related notices

• USN-4145-1: linux-image-kvm, linux-image-powerpc-e500mc-lts-vivid, linux-image-virtual-lts-vivid, linux-image-powerpc64-smp, linux, linux-image-generic-lpae-lts-vivid, linux-image-powerpc-e500mc-lts-utopic, linux-image-4.4.0-165-lowlatency, linux-image-powerpc-smp-lts-wily, linux-image-4.4.0-1095-aws, linux-image-powerpc64-emb-lts-utopic, linux-image-virtual-lts-utopic, 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-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-snapdragon, linux-image-powerpc-smp, linux-image-generic-lpae, linux-image-powerpc64-smp-lts-vivid, linux-image-4.4.0-165-powerpc64-emb, linux-image-generic-lts-vivid, linux-image-generic-lpae-lts-utopic, linux-image-virtual-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-165-powerpc-e500mc, linux-image-4.4.0-165-powerpc-smp, linux-image-generic-lts-utopic, linux-image-4.4.0-165-generic, linux-image-generic-lpae-lts-wily, linux-image-lowlatency-lts-utopic, linux-image-4.4.0-1059-kvm, linux-image-4.4.0-1127-snapdragon, 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-4.4.0-165-generic-lpae, linux-image-aws, linux-image-powerpc-smp-lts-xenial, linux-kvm, linux-aws, linux-image-4.4.0-165-powerpc64-smp, linux-image-4.4.0-1123-raspi2, 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-4118-1: linux-image-4.15.0-1047-aws, linux-image-aws, linux-aws, linux-image-aws-hwe, linux-aws-hwe
• USN-4115-1: linux-image-4.15.0-1044-raspi2, linux-image-kvm, linux-image-generic-lpae-hwe-16.04, linux, linux-image-virtual-hwe-16.04, linux-image-4.15.0-1043-kvm, linux-image-4.15.0-1022-oracle, linux-image-generic-hwe-16.04, linux-image-lowlatency-hwe-16.04, linux-raspi2, linux-gke-4.15, linux-azure, linux-image-lowlatency, linux-image-4.15.0-60-generic, linux-image-generic-lpae, linux-image-generic-hwe-16.04-edge, linux-image-4.15.0-60-lowlatency, linux-image-azure, linux-gcp, linux-image-gke-4.15, linux-image-generic, linux-image-oem, linux-image-raspi2, linux-image-oracle, linux-image-gcp, linux-image-lowlatency-hwe-16.04-edge, linux-image-4.15.0-1041-gke, linux-image-virtual, linux-image-4.15.0-1041-gcp, linux-image-4.15.0-1056-azure, linux-image-virtual-hwe-16.04-edge, linux-image-generic-lpae-hwe-16.04-edge, linux-hwe, linux-kvm, linux-image-4.15.0-60-generic-lpae, linux-image-gke, linux-oracle
• USN-4069-2: linux-image-5.0.0-23-lowlatency, linux-image-snapdragon-hwe-18.04, linux-image-generic-lpae-hwe-18.04, linux-image-5.0.0-23-generic-lpae, linux-hwe, linux-image-5.0.0-23-generic, linux-image-virtual-hwe-18.04, linux-image-lowlatency-hwe-18.04, linux-image-generic-hwe-18.04
• USN-4095-1: linux-image-kvm, linux-image-4.4.0-159-powerpc64-emb, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc64-smp, linux-image-virtual-lts-vivid, linux, linux-image-generic-lpae-lts-vivid, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc-smp-lts-wily, linux-image-4.4.0-1122-snapdragon, linux-image-powerpc64-emb-lts-utopic, linux-image-4.4.0-159-generic, linux-image-virtual-lts-utopic, 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-powerpc-smp-lts-vivid, linux-image-lowlatency-lts-xenial, linux-image-lowlatency-lts-wily, linux-image-powerpc-e500mc, linux-snapdragon, linux-image-4.4.0-1090-aws, linux-image-lowlatency, linux-image-4.4.0-159-powerpc-e500mc, linux-image-snapdragon, linux-image-powerpc-smp, linux-image-4.4.0-1054-kvm, linux-image-generic-lpae, linux-image-powerpc64-smp-lts-vivid, linux-image-generic-lts-vivid, linux-image-generic-lpae-lts-utopic, linux-image-4.4.0-159-powerpc64-smp, linux-image-4.4.0-159-generic-lpae, linux-image-powerpc-e500mc-lts-xenial, linux-image-virtual-lts-xenial, linux-image-4.4.0-159-powerpc-smp, linux-image-generic-lts-utopic, linux-image-generic-lpae-lts-wily, linux-image-4.4.0-1118-raspi2, 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-4.4.0-159-lowlatency, 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-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-4076-1: linux-image-kvm, linux-image-powerpc-e500mc-lts-vivid, linux-image-virtual-lts-vivid, linux-image-powerpc64-smp, linux, linux-image-generic-lpae-lts-vivid, linux-image-powerpc-e500mc-lts-utopic, linux-image-generic-lts-xenial, linux-image-powerpc-smp-lts-wily, linux-image-4.4.0-1117-raspi2, linux-image-powerpc64-emb-lts-utopic, linux-image-virtual-lts-utopic, 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-powerpc-smp-lts-vivid, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-157-powerpc64-emb, linux-image-lowlatency-lts-wily, linux-image-powerpc-e500mc, linux-image-lowlatency, linux-image-powerpc-smp, 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-powerpc-e500mc-lts-xenial, linux-image-generic-lts-utopic, linux-image-generic-lpae-lts-wily, linux-image-lowlatency-lts-utopic, linux-image-4.4.0-157-lowlatency, linux-image-generic, linux-image-lowlatency-lts-vivid, linux-image-powerpc64-emb-lts-wily, linux-image-raspi2, linux-image-4.4.0-157-powerpc64-smp, linux-image-powerpc-smp-lts-utopic, linux-image-4.4.0-1052-kvm, linux-image-virtual, linux-image-4.4.0-157-powerpc-e500mc, linux-image-aws, linux-image-powerpc-smp-lts-xenial, linux-kvm, linux-image-4.4.0-157-powerpc-smp, linux-aws, linux-image-4.4.0-157-generic-lpae, linux-image-generic-lts-wily, linux-image-powerpc64-emb-lts-vivid, linux-image-4.4.0-157-generic, linux-image-powerpc64-emb, linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-1088-aws, linux-image-powerpc64-smp-lts-utopic, linux-image-virtual-lts-wily
• USN-4068-2: linux-image-4.15.0-55-generic, linux-image-4.15.0-55-generic-lpae, linux-image-generic-lpae-hwe-16.04, linux-image-oem, linux-image-virtual-hwe-16.04, linux-hwe, linux-gcp, linux-image-4.15.0-55-lowlatency, linux-image-gke, linux-image-generic-hwe-16.04, linux-image-lowlatency-hwe-16.04, linux-image-gcp, linux-image-4.15.0-1037-gcp
• USN-4068-1: linux-image-kvm, linux-image-generic-lpae-hwe-16.04, linux, linux-image-virtual-hwe-16.04, linux-image-generic-hwe-16.04, linux-image-lowlatency-hwe-16.04, linux-raspi2, linux-snapdragon, linux-image-lowlatency, linux-image-snapdragon, linux-image-generic-lpae, linux-image-4.15.0-1058-snapdragon, linux-image-generic-hwe-16.04-edge, linux-image-4.15.0-1037-gcp, linux-image-4.15.0-55-generic, linux-gcp, linux-image-4.15.0-1018-oracle, linux-image-generic, linux-image-raspi2, linux-image-oracle, linux-image-gcp, linux-image-lowlatency-hwe-16.04-edge, linux-image-virtual, linux-image-4.15.0-55-generic-lpae, linux-image-virtual-hwe-16.04-edge, linux-image-4.15.0-1044-aws, linux-image-generic-lpae-hwe-16.04-edge, linux-image-aws, linux-image-4.15.0-55-lowlatency, linux-kvm, linux-aws, linux-image-4.15.0-1039-kvm, linux-image-4.15.0-1041-raspi2, linux-oracle
• USN-4095-2: linux-image-4.4.0-159-powerpc64-emb, linux-image-4.4.0-1050-aws, linux-image-4.4.0-159-generic, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-159-powerpc-e500mc, linux-lts-xenial, linux-image-virtual-lts-xenial, linux-image-4.4.0-159-powerpc64-smp, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-159-generic-lpae, linux-image-4.4.0-159-powerpc-smp, linux-image-4.4.0-159-lowlatency, linux-image-aws, linux-image-powerpc-smp-lts-xenial, linux-aws, linux-image-generic-lpae-lts-xenial, linux-image-generic-lts-xenial