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Ubuntu Security Notice USN-4144-1

Ubuntu Security Notice USN-4144-1
Posted Oct 1, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4144-1 - 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 or execute arbitrary code. 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. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2018-20976, CVE-2019-15538
SHA-256 | 5dd65d9602394aefa348c4338b4b2eb8e342d2c44ad1989c239607e1f8bc53c8

Ubuntu Security Notice USN-4144-1

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-4144-1
October 01, 2019

linux, linux-aws, linux-aws-hwe, linux-azure, linux-hwe, linux-kvm,
linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- 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
- 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

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 LTS:
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-powerpc-e500mc 4.15.0.65.67
linux-image-powerpc-smp 4.15.0.65.67
linux-image-powerpc64-emb 4.15.0.65.67
linux-image-powerpc64-smp 4.15.0.65.67
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 LTS:
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:
https://usn.ubuntu.com/4144-1
CVE-2018-20976, CVE-2019-15538

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-65.74
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1051.53
https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1047.47
https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1057.66
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1026.29
https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1048.52
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1065.72
https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1051.53~16.04.1
https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1060.65
https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-65.74~16.04.1
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1026.29~16.04.1
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