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Ubuntu Security Notice USN-4465-1

Ubuntu Security Notice USN-4465-1
Posted Aug 19, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4465-1 - It was discovered that the XFS file system implementation in the Linux kernel did not properly validate meta data in some circumstances. 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 bcache subsystem in the Linux kernel did not properly release a lock in some error conditions. A local attacker could possibly use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2020-12655, CVE-2020-12771, CVE-2020-15393
SHA-256 | d61918c79cfb7d2a7c42dc5a881a9fdf1bf9ceb9e554b0b44c7668274b983ab2

Ubuntu Security Notice USN-4465-1

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-4465-1
August 19, 2020

linux-hwe, linux-azure-5.3, linux-gke-5.3, vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-azure-5.3: Linux kernel for microsoft azure cloud systems
- linux-gke-5.3: Linux kernel for Google Container Engine (GKE) systems
- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

It was discovered that the XFS file system implementation in the Linux
kernel did not properly validate meta data in some circumstances. An
attacker could use this to construct a malicious XFS image that, when
mounted, could cause a denial of service. (CVE-2020-12655)

It was discovered that the bcache subsystem in the Linux kernel did not
properly release a lock in some error conditions. A local attacker could
possibly use this to cause a denial of service. (CVE-2020-12771)

Kyungtae Kim discovered that the USB testing driver in the Linux kernel did
not properly deallocate memory on disconnect events. A physically proximate
attacker could use this to cause a denial of service (memory exhaustion).
(CVE-2020-15393)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-5.3.0-1033-gke 5.3.0-1033.35
linux-image-5.3.0-1035-azure 5.3.0-1035.36
linux-image-5.3.0-65-generic 5.3.0-65.59
linux-image-5.3.0-65-lowlatency 5.3.0-65.59
linux-image-azure 5.3.0.1035.31
linux-image-gke-5.3 5.3.0.1033.18
linux-image-gkeop-5.3 5.3.0.65.121

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/4465-1
CVE-2020-12655, CVE-2020-12771, CVE-2020-15393

Package Information:
https://launchpad.net/ubuntu/+source/linux-azure-5.3/5.3.0-1035.36
https://launchpad.net/ubuntu/+source/linux-gke-5.3/5.3.0-1033.35
https://launchpad.net/ubuntu/+source/linux-hwe/5.3.0-65.59
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