USN-4144-1: Linux kernel vulnerabilities

Releases

• Ubuntu 18.04 ESM
• Ubuntu 16.04 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-hwe - Linux hardware enablement (HWE) kernel
• linux-kvm - Linux kernel for cloud environments
• linux-oem - Linux kernel for OEM processors
• linux-oracle - Linux kernel for Oracle Cloud systems
• linux-raspi2 - Linux kernel for Raspberry Pi 2
• linux-snapdragon - Linux kernel for Snapdragon processors

Details

It was discovered that the XFS file system in the Linux kernel did not
properly handle mount failures in some situations. A local attacker could
possibly use this to cause a denial of service (system crash) or execute
arbitrary code. (CVE-2018-20976)

Benjamin Moody discovered that the XFS file system in the Linux kernel did
not properly handle an error condition when out of disk quota. A local
attacker could possibly use this to cause a denial of service.
(CVE-2019-15538)

Update instructions

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

Ubuntu 18.04

• linux-image-4.15.0-1026-oracle - 4.15.0-1026.29
• linux-image-4.15.0-1047-kvm - 4.15.0-1047.47
• linux-image-4.15.0-1048-raspi2 - 4.15.0-1048.52
• linux-image-4.15.0-1051-aws - 4.15.0-1051.53
• linux-image-4.15.0-1057-oem - 4.15.0-1057.66
• linux-image-4.15.0-1065-snapdragon - 4.15.0-1065.72
• linux-image-4.15.0-65-generic - 4.15.0-65.74
• linux-image-4.15.0-65-generic-lpae - 4.15.0-65.74
• linux-image-4.15.0-65-lowlatency - 4.15.0-65.74
• linux-image-aws - 4.15.0.1051.50
• linux-image-generic - 4.15.0.65.67
• linux-image-generic-lpae - 4.15.0.65.67
• linux-image-kvm - 4.15.0.1047.47
• linux-image-lowlatency - 4.15.0.65.67
• linux-image-oem - 4.15.0.1057.61
• linux-image-oracle - 4.15.0.1026.29
• linux-image-raspi2 - 4.15.0.1048.46
• linux-image-snapdragon - 4.15.0.1065.68
• linux-image-virtual - 4.15.0.65.67

Ubuntu 16.04

• linux-image-4.15.0-1026-oracle - 4.15.0-1026.29~16.04.1
• linux-image-4.15.0-1051-aws - 4.15.0-1051.53~16.04.1
• linux-image-4.15.0-1060-azure - 4.15.0-1060.65
• linux-image-4.15.0-65-generic - 4.15.0-65.74~16.04.1
• linux-image-4.15.0-65-generic-lpae - 4.15.0-65.74~16.04.1
• linux-image-4.15.0-65-lowlatency - 4.15.0-65.74~16.04.1
• linux-image-aws-hwe - 4.15.0.1051.51
• linux-image-azure - 4.15.0.1060.63
• linux-image-generic-hwe-16.04 - 4.15.0.65.85
• linux-image-generic-lpae-hwe-16.04 - 4.15.0.65.85
• linux-image-lowlatency-hwe-16.04 - 4.15.0.65.85
• linux-image-oem - 4.15.0.65.85
• linux-image-oracle - 4.15.0.1026.19
• linux-image-virtual-hwe-16.04 - 4.15.0.65.85

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-2018-20976
• CVE-2019-15538

Related notices

• USN-4145-1: linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-1095-aws, linux-image-powerpc-e500mc-lts-xenial, linux-image-powerpc64-smp, linux-image-virtual, linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-165-lowlatency, linux-image-powerpc64-smp-lts-utopic, linux-image-powerpc-smp-lts-wily, linux-image-powerpc64-smp-lts-wily, linux-image-powerpc64-smp-lts-vivid, linux-image-generic-lpae-lts-utopic, linux-image-4.4.0-165-powerpc64-smp, linux-image-generic-lts-utopic, linux-image-powerpc-smp-lts-utopic, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc-e500mc, linux-image-generic-lpae-lts-vivid, linux-kvm, linux-image-lowlatency, linux-image-powerpc64-emb-lts-vivid, linux-raspi2, linux-image-generic-lts-wily, linux-image-4.4.0-165-powerpc-e500mc, linux-image-generic-lts-vivid, linux-image-lowlatency-lts-utopic, linux-image-powerpc-smp-lts-vivid, linux-image-virtual-lts-vivid, linux-image-powerpc64-emb, linux, linux-image-aws, linux-image-powerpc64-emb-lts-utopic, linux-image-generic, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-1127-snapdragon, linux-image-powerpc-smp, linux-image-4.4.0-165-generic, linux-snapdragon, linux-image-4.4.0-1059-kvm, linux-image-powerpc64-emb-lts-wily, linux-image-lowlatency-lts-vivid, linux-image-generic-lts-xenial, linux-image-virtual-lts-utopic, linux-image-raspi2, linux-image-snapdragon, linux-image-4.4.0-165-generic-lpae, linux-image-generic-lpae-lts-wily, linux-image-kvm, linux-image-lowlatency-lts-wily, linux-image-generic-lpae, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-1123-raspi2, linux-image-powerpc-e500mc-lts-utopic, linux-image-virtual-lts-xenial, linux-image-4.4.0-165-powerpc-smp, linux-aws, linux-image-powerpc-e500mc-lts-wily, linux-image-4.4.0-165-powerpc64-emb, linux-image-virtual-lts-wily
• USN-4147-1: linux-gke-5.0, linux-image-virtual, linux-image-5.0.0-1023-snapdragon, linux-image-5.0.0-1019-raspi2, linux-image-5.0.0-31-generic, linux-image-lowlatency-hwe-18.04, linux-image-5.0.0-31-lowlatency, linux-image-gcp, linux-kvm, linux-image-lowlatency, linux-raspi2, linux-image-5.0.0-1020-gcp, linux, linux-image-aws, linux-azure, linux-image-generic, linux-image-virtual-hwe-18.04, linux-image-5.0.0-1020-gke, linux-gcp, linux-snapdragon, linux-image-generic-lpae-hwe-18.04, linux-image-5.0.0-1019-kvm, linux-image-5.0.0-1022-azure, linux-image-5.0.0-1018-aws, linux-image-5.0.0-31-generic-lpae, linux-hwe, linux-image-kvm, linux-image-raspi2, linux-image-generic-hwe-18.04, linux-image-gke, linux-image-generic-lpae, linux-image-snapdragon, linux-image-gke-5.0, linux-image-snapdragon-hwe-18.04, linux-aws, linux-image-azure