[USN-4369-1] Linux kernel vulnerabilities

Steve Beattie steve.beattie at canonical.com
Thu May 21 03:45:58 UTC 2020 

==========================================================================
Ubuntu Security Notice USN-4369-1
May 21, 2020

linux, linux-aws, linux-aws-5.3, linux-gcp, linux-gcp-5.3, linux-gke-5.3,
linux-hwe, linux-kvm, linux-oracle, linux-oracle-5.3, linux-raspi2
vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 19.10
- Ubuntu 18.04 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-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 (V7) systems
- linux-aws-5.3: Linux kernel for Amazon Web Services (AWS) systems
- linux-gcp-5.3: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke-5.3: Linux kernel for Google Container Engine (GKE) systems
- linux-hwe: Linux hardware enablement (HWE) kernel
- linux-oracle-5.3: Linux kernel for Oracle Cloud systems

Details:

It was discovered that the btrfs implementation in the Linux kernel did not
properly detect that a block was marked dirty in some situations. An
attacker could use this to specially craft a file system image that, when
unmounted, could cause a denial of service (system crash). (CVE-2019-19377)

Tristan Madani discovered that the file locking implementation in the Linux
kernel contained a race condition. A local attacker could possibly use this
to cause a denial of service or expose sensitive information.
(CVE-2019-19769)

It was discovered that the Serial CAN interface driver in the Linux kernel
did not properly initialize data. A local attacker could use this to expose
sensitive information (kernel memory). (CVE-2020-11494)

It was discovered that the linux kernel did not properly validate certain
mount options to the tmpfs virtual memory file system. A local attacker
with the ability to specify mount options could use this to cause a denial
of service (system crash). (CVE-2020-11565)

It was discovered that the OV51x USB Camera device driver in the Linux
kernel did not properly validate device metadata. A physically proximate
attacker could use this to cause a denial of service (system crash).
(CVE-2020-11608)

It was discovered that the STV06XX USB Camera device driver in the Linux
kernel did not properly validate device metadata. A physically proximate
attacker could use this to cause a denial of service (system crash).
(CVE-2020-11609)

It was discovered that the Xirlink C-It USB Camera device driver in the
Linux kernel did not properly validate device metadata. A physically
proximate attacker could use this to cause a denial of service (system
crash). (CVE-2020-11668)

It was discovered that the block layer in the Linux kernel contained a race
condition leading to a use-after-free vulnerability. A local attacker could
possibly use this to cause a denial of service (system crash) or execute
arbitrary code. (CVE-2020-12657)

Update instructions:

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

Ubuntu 19.10:
  linux-image-5.3.0-1017-kvm      5.3.0-1017.19
  linux-image-5.3.0-1018-oracle   5.3.0-1018.20
  linux-image-5.3.0-1019-aws      5.3.0-1019.21
  linux-image-5.3.0-1020-gcp      5.3.0-1020.22
  linux-image-5.3.0-1025-raspi2   5.3.0-1025.27
  linux-image-5.3.0-53-generic    5.3.0-53.47
  linux-image-5.3.0-53-generic-lpae  5.3.0-53.47
  linux-image-5.3.0-53-lowlatency  5.3.0-53.47
  linux-image-5.3.0-53-snapdragon  5.3.0-53.47
  linux-image-aws                 5.3.0.1019.31
  linux-image-gcp                 5.3.0.1020.31
  linux-image-generic             5.3.0.53.45
  linux-image-generic-lpae        5.3.0.53.45
  linux-image-gke                 5.3.0.1020.31
  linux-image-kvm                 5.3.0.1017.19
  linux-image-lowlatency          5.3.0.53.45
  linux-image-oracle              5.3.0.1018.33
  linux-image-raspi2              5.3.0.1025.22
  linux-image-snapdragon          5.3.0.53.45
  linux-image-virtual             5.3.0.53.45

Ubuntu 18.04 LTS:
  linux-image-5.3.0-1018-oracle   5.3.0-1018.20~18.04.1
  linux-image-5.3.0-1019-aws      5.3.0-1019.21~18.04.1
  linux-image-5.3.0-1020-gcp      5.3.0-1020.22~18.04.1
  linux-image-5.3.0-1020-gke      5.3.0-1020.22~18.04.1
  linux-image-5.3.0-53-generic    5.3.0-53.47~18.04.1
  linux-image-5.3.0-53-generic-lpae  5.3.0-53.47~18.04.1
  linux-image-5.3.0-53-lowlatency  5.3.0-53.47~18.04.1
  linux-image-aws                 5.3.0.1019.20
  linux-image-aws-edge            5.3.0.1019.20
  linux-image-gcp                 5.3.0.1020.19
  linux-image-gcp-edge            5.3.0.1020.19
  linux-image-generic-hwe-18.04   5.3.0.53.109
  linux-image-generic-lpae-hwe-18.04  5.3.0.53.109
  linux-image-gke-5.3             5.3.0.1020.10
  linux-image-gkeop-5.3           5.3.0.53.109
  linux-image-lowlatency-hwe-18.04  5.3.0.53.109
  linux-image-oracle              5.3.0.1018.19
  linux-image-snapdragon-hwe-18.04  5.3.0.53.109
  linux-image-virtual-hwe-18.04   5.3.0.53.109

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/4369-1
  CVE-2019-19377, CVE-2019-19769, CVE-2020-11494, CVE-2020-11565,
  CVE-2020-11608, CVE-2020-11609, CVE-2020-11668, CVE-2020-12657

Package Information:
  https://launchpad.net/ubuntu/+source/linux/5.3.0-53.47
  https://launchpad.net/ubuntu/+source/linux-aws/5.3.0-1019.21
  https://launchpad.net/ubuntu/+source/linux-gcp/5.3.0-1020.22
  https://launchpad.net/ubuntu/+source/linux-kvm/5.3.0-1017.19
  https://launchpad.net/ubuntu/+source/linux-oracle/5.3.0-1018.20
  https://launchpad.net/ubuntu/+source/linux-raspi2/5.3.0-1025.27
  https://launchpad.net/ubuntu/+source/linux-aws-5.3/5.3.0-1019.21~18.04.1
  https://launchpad.net/ubuntu/+source/linux-gcp-5.3/5.3.0-1020.22~18.04.1
  https://launchpad.net/ubuntu/+source/linux-gke-5.3/5.3.0-1020.22~18.04.1
  https://launchpad.net/ubuntu/+source/linux-hwe/5.3.0-53.47~18.04.1
  https://launchpad.net/ubuntu/+source/linux-oracle-5.3/5.3.0-1018.20~18.04.1

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