USN-4068-1: Linux kernel vulnerabilities

Releases

• Ubuntu 18.04 ESM

Packages

• linux - Linux kernel
• linux-aws - Linux kernel for Amazon Web Services (AWS) 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-raspi2 - Linux kernel for Raspberry Pi 2
• linux-snapdragon - Linux kernel for Snapdragon processors

Details

Adam Zabrocki discovered that the Intel i915 kernel mode graphics driver in
the Linux kernel did not properly restrict mmap() ranges in some
situations. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2019-11085)

It was discovered that a race condition leading to a use-after-free existed
in the Reliable Datagram Sockets (RDS) protocol implementation in the Linux
kernel. The RDS protocol is disabled via blocklist by default in Ubuntu.
If enabled, a local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2019-11815)

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 18.04

• linux-image-4.15.0-1018-oracle - 4.15.0-1018.20
• linux-image-4.15.0-1037-gcp - 4.15.0-1037.39
• linux-image-4.15.0-1039-kvm - 4.15.0-1039.39
• linux-image-4.15.0-1041-raspi2 - 4.15.0-1041.44
• linux-image-4.15.0-1044-aws - 4.15.0-1044.46
• linux-image-4.15.0-1058-snapdragon - 4.15.0-1058.64
• linux-image-4.15.0-55-generic - 4.15.0-55.60
• linux-image-4.15.0-55-generic-lpae - 4.15.0-55.60
• linux-image-4.15.0-55-lowlatency - 4.15.0-55.60
• linux-image-aws - 4.15.0.1044.43
• linux-image-gcp - 4.15.0.1037.39
• linux-image-generic - 4.15.0.55.57
• linux-image-generic-lpae - 4.15.0.55.57
• linux-image-kvm - 4.15.0.1039.39
• linux-image-lowlatency - 4.15.0.55.57
• linux-image-oracle - 4.15.0.1018.21
• linux-image-raspi2 - 4.15.0.1041.39
• linux-image-snapdragon - 4.15.0.1058.61
• linux-image-virtual - 4.15.0.55.57

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-2019-11085
• CVE-2019-11815
• CVE-2019-11833
• CVE-2019-11884

Related notices

• USN-4118-1: linux-aws, linux-image-aws, linux-aws-hwe, linux-image-4.15.0-1047-aws, linux-image-aws-hwe
• USN-4068-2: linux-image-4.15.0-55-lowlatency, linux-image-gcp, linux-image-4.15.0-55-generic-lpae, linux-image-lowlatency-hwe-16.04, linux-image-generic-hwe-16.04, linux-image-4.15.0-1037-gcp, linux-image-gke, linux-hwe, linux-image-virtual-hwe-16.04, linux-image-4.15.0-55-generic, linux-gcp, linux-image-oem, linux-image-generic-lpae-hwe-16.04
• USN-4008-1: linux-image-4.4.0-150-generic-lpae, linux-image-generic-lts-utopic, linux-image-generic-lts-xenial, linux-snapdragon, linux-image-virtual-lts-wily, linux-image-4.4.0-1047-kvm, linux-image-generic-lts-vivid, linux-image-4.4.0-150-powerpc64-smp, linux-image-4.4.0-1084-aws, linux, linux-image-4.4.0-150-powerpc-e500mc, linux-image-lowlatency, linux-image-generic-lts-wily, linux-image-powerpc64-emb-lts-vivid, linux-image-powerpc-e500mc, 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-4.4.0-1110-raspi2, linux-image-generic, linux-image-4.4.0-150-lowlatency, 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-4.4.0-1114-snapdragon, linux-image-powerpc-smp-lts-wily, linux-image-generic-lpae, linux-image-4.4.0-150-powerpc-smp, linux-image-snapdragon, linux-image-lowlatency-lts-wily, linux-image-powerpc-e500mc-lts-vivid, linux-image-4.4.0-150-generic, linux-image-generic-lpae-lts-vivid, linux-image-aws, linux-image-lowlatency-lts-utopic, linux-image-raspi2, linux-image-powerpc64-smp-lts-vivid, linux-image-powerpc-e500mc-lts-utopic, linux-image-kvm, linux-image-powerpc-smp-lts-vivid, linux-image-powerpc64-smp-lts-wily, linux-aws, linux-image-powerpc64-smp, linux-image-lowlatency-lts-vivid, 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-image-4.4.0-150-powerpc64-emb, 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
• USN-4008-3: linux-image-4.4.0-150-generic-lpae, linux-image-generic-lts-xenial, linux-image-4.4.0-150-powerpc64-smp, linux-image-4.4.0-150-powerpc-e500mc, linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-150-lowlatency, linux-image-lowlatency-lts-xenial, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-150-powerpc-smp, linux-image-4.4.0-150-generic, linux-lts-xenial, linux-image-aws, linux-aws, linux-image-powerpc-e500mc-lts-xenial, linux-image-virtual-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-1045-aws, linux-image-4.4.0-150-powerpc64-emb, linux-image-powerpc64-emb-lts-xenial
• USN-4005-1: linux-image-5.0.0-16-lowlatency, linux-image-gcp, linux-snapdragon, linux-image-gke, linux, linux-image-5.0.0-16-generic-lpae, linux-image-lowlatency, linux-image-5.0.0-1007-gcp, linux-image-5.0.0-1007-aws, linux-image-5.0.0-1007-kvm, linux-image-5.0.0-16-generic, linux-image-generic, linux-image-5.0.0-1013-snapdragon, linux-image-generic-lpae, linux-image-snapdragon, linux-image-aws, linux-image-raspi2, linux-image-kvm, linux-gcp, linux-aws, linux-image-5.0.0-1009-raspi2, linux-raspi2, linux-image-virtual, linux-kvm
• USN-4076-1: linux-image-generic-lts-utopic, linux-image-4.4.0-1088-aws, linux-image-4.4.0-157-powerpc-smp, linux-image-generic-lts-xenial, linux-image-4.4.0-157-lowlatency, linux-image-virtual-lts-wily, linux-image-generic-lts-vivid, linux, linux-image-lowlatency, linux-image-generic-lts-wily, linux-image-powerpc64-emb-lts-vivid, linux-image-powerpc-e500mc, linux-image-virtual-lts-utopic, linux-image-generic-lpae-lts-utopic, linux-image-powerpc64-emb-lts-wily, linux-image-4.4.0-157-powerpc64-emb, linux-image-generic-lpae-lts-xenial, linux-kvm, linux-image-generic, linux-image-4.4.0-157-generic, linux-image-powerpc-e500mc-lts-wily, linux-image-4.4.0-157-powerpc-e500mc, 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-4.4.0-1117-raspi2, linux-image-generic-lpae, linux-image-4.4.0-157-generic-lpae, linux-image-4.4.0-1052-kvm, linux-image-lowlatency-lts-wily, linux-image-powerpc-e500mc-lts-vivid, linux-image-generic-lpae-lts-vivid, linux-image-aws, linux-image-lowlatency-lts-utopic, linux-image-raspi2, linux-image-powerpc64-smp-lts-vivid, linux-image-powerpc-e500mc-lts-utopic, linux-image-kvm, linux-image-powerpc-smp-lts-vivid, linux-image-powerpc64-smp-lts-wily, linux-aws, linux-image-powerpc64-smp, linux-image-lowlatency-lts-vivid, linux-image-powerpc-e500mc-lts-xenial, linux-image-virtual-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-157-powerpc64-smp, 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
• USN-4069-2: linux-image-generic-hwe-18.04, linux-image-lowlatency-hwe-18.04, linux-image-5.0.0-23-lowlatency, linux-hwe, linux-image-virtual-hwe-18.04, linux-image-generic-lpae-hwe-18.04, linux-image-5.0.0-23-generic, linux-image-snapdragon-hwe-18.04, linux-image-5.0.0-23-generic-lpae
• USN-4095-2: linux-image-generic-lts-xenial, linux-image-4.4.0-159-lowlatency, linux-image-4.4.0-1050-aws, linux-image-4.4.0-159-powerpc64-smp, linux-image-4.4.0-159-powerpc-smp, linux-image-generic-lpae-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-159-powerpc-e500mc, linux-lts-xenial, linux-image-aws, linux-image-4.4.0-159-generic, linux-aws, linux-image-powerpc-e500mc-lts-xenial, linux-image-virtual-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-159-powerpc64-emb, linux-image-4.4.0-159-generic-lpae, linux-image-powerpc64-emb-lts-xenial
• USN-4069-1: linux-image-gcp, linux-image-5.0.0-1011-kvm, linux-snapdragon, linux-image-gke, linux-image-5.0.0-21-generic, linux-image-5.0.0-21-lowlatency, linux-image-5.0.0-1013-raspi2, linux, linux-image-5.0.0-1017-snapdragon, linux-image-lowlatency, linux-image-azure, linux-image-5.0.0-1011-gcp, linux-image-generic, linux-image-generic-lpae, linux-image-5.0.0-1012-azure, linux-image-5.0.0-21-generic-lpae, linux-azure, linux-image-snapdragon, linux-image-aws, linux-image-raspi2, linux-image-kvm, linux-gcp, linux-aws, linux-raspi2, linux-image-virtual, linux-kvm, linux-image-5.0.0-1011-aws