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Ubuntu Security Notice USN-4907-1

Ubuntu Security Notice USN-4907-1
Posted Apr 13, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4907-1 - Wen Xu discovered that the xfs file system implementation in the Linux kernel did not properly validate the number of extents in an inode. An attacker could use this to construct a malicious xfs image that, when mounted, could cause a denial of service. It was discovered that the priority inheritance futex implementation in the Linux kernel contained a race condition, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2018-13095, CVE-2021-3347, CVE-2021-3348
MD5 | 2715302b59fea77c929d49d3d104d3c0

Ubuntu Security Notice USN-4907-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4907-1
April 13, 2021

linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15,
linux-dell300x, linux-gcp, linux-gcp-4.15, linux-kvm, 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
- Ubuntu 14.04 ESM

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-azure-4.15: Linux kernel for Microsoft Azure Cloud systems
- linux-dell300x: Linux kernel for Dell 300x platforms
- linux-gcp-4.15: 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 (V8) systems
- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors
- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

Details:

Wen Xu discovered that the xfs file system implementation in the Linux
kernel did not properly validate the number of extents in an inode. An
attacker could use this to construct a malicious xfs image that, when
mounted, could cause a denial of service (system crash). (CVE-2018-13095)

It was discovered that the priority inheritance futex implementation in the
Linux kernel contained a race condition, leading to a use-after-free
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2021-3347)

It was discovered that the network block device (nbd) driver in the Linux
kernel contained a use-after-free vulnerability during device setup. A
local attacker with access to the nbd device could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2021-3348)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.15.0-1016-dell300x 4.15.0-1016.20
linux-image-4.15.0-1069-oracle 4.15.0-1069.77
linux-image-4.15.0-1083-raspi2 4.15.0-1083.88
linux-image-4.15.0-1089-kvm 4.15.0-1089.91
linux-image-4.15.0-1097-gcp 4.15.0-1097.110
linux-image-4.15.0-1098-aws 4.15.0-1098.105
linux-image-4.15.0-1100-snapdragon 4.15.0-1100.109
linux-image-4.15.0-1112-azure 4.15.0-1112.125
linux-image-4.15.0-141-generic 4.15.0-141.145
linux-image-4.15.0-141-generic-lpae 4.15.0-141.145
linux-image-4.15.0-141-lowlatency 4.15.0-141.145
linux-image-aws-lts-18.04 4.15.0.1098.101
linux-image-azure-lts-18.04 4.15.0.1112.85
linux-image-dell300x 4.15.0.1016.18
linux-image-gcp-lts-18.04 4.15.0.1097.115
linux-image-generic 4.15.0.141.128
linux-image-generic-lpae 4.15.0.141.128
linux-image-kvm 4.15.0.1089.85
linux-image-lowlatency 4.15.0.141.128
linux-image-oracle-lts-18.04 4.15.0.1069.79
linux-image-powerpc-e500mc 4.15.0.141.128
linux-image-powerpc-smp 4.15.0.141.128
linux-image-powerpc64-emb 4.15.0.141.128
linux-image-powerpc64-smp 4.15.0.141.128
linux-image-raspi2 4.15.0.1083.80
linux-image-snapdragon 4.15.0.1100.103
linux-image-virtual 4.15.0.141.128

Ubuntu 16.04 LTS:
linux-image-4.15.0-1069-oracle 4.15.0-1069.77~16.04.1
linux-image-4.15.0-1097-gcp 4.15.0-1097.110~16.04.1
linux-image-4.15.0-1098-aws 4.15.0-1098.105~16.04.1
linux-image-4.15.0-1112-azure 4.15.0-1112.124~16.04.1
linux-image-aws-hwe 4.15.0.1098.91
linux-image-azure 4.15.0.1112.103
linux-image-gcp 4.15.0.1097.98
linux-image-gke 4.15.0.1097.98
linux-image-oracle 4.15.0.1069.57

Ubuntu 14.04 ESM:
linux-image-4.15.0-1112-azure 4.15.0-1112.124~14.04.1
linux-image-azure 4.15.0.1112.85

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://ubuntu.com/security/notices/USN-4907-1
CVE-2018-13095, CVE-2021-3347, CVE-2021-3348

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-141.145
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1098.105
https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1112.125
https://launchpad.net/ubuntu/+source/linux-dell300x/4.15.0-1016.20
https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1097.110
https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1089.91
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1069.77
https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1083.88
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1100.109
https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1098.105~16.04.1
https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1112.124~16.04.1
https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1097.110~16.04.1
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1069.77~16.04.1

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