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Ubuntu Security Notice USN-5073-3

Ubuntu Security Notice USN-5073-3
Posted Sep 22, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5073-3 - Norbert Slusarek discovered that the CAN broadcast manger protocol implementation in the Linux kernel did not properly initialize memory in some situations. A local attacker could use this to expose sensitive information. Murray McAllister discovered that the joystick device interface in the Linux kernel did not properly validate data passed via an ioctl. A local attacker could use this to cause a denial of service or possibly execute arbitrary code on systems with a joystick device registered. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local, protocol
systems | linux, ubuntu
advisories | CVE-2021-34693, CVE-2021-3612, CVE-2021-38160
SHA-256 | 54229c6485d89ba4f6823e5d92635e12f16c9f00cf3975395a04c4e81124b2eb

Ubuntu Security Notice USN-5073-3

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5073-3
September 22, 2021

linux-raspi2 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-raspi2: Linux kernel for Raspberry Pi (V8) systems

Details:

Norbert Slusarek discovered that the CAN broadcast manger (bcm) protocol
implementation in the Linux kernel did not properly initialize memory in
some situations. A local attacker could use this to expose sensitive
information (kernel memory). (CVE-2021-34693)

Murray McAllister discovered that the joystick device interface in the
Linux kernel did not properly validate data passed via an ioctl(). A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code on systems with a joystick device
registered. (CVE-2021-3612)

It was discovered that the Virtio console implementation in the Linux
kernel did not properly validate input lengths in some situations. A local
attacker could possibly use this to cause a denial of service (system
crash). (CVE-2021-38160)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.15.0-1095-raspi2 4.15.0-1095.101
linux-image-raspi2 4.15.0.1095.93

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-5073-3
https://ubuntu.com/security/notices/USN-5073-1
CVE-2021-34693, CVE-2021-3612, CVE-2021-38160

Package Information:
https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1095.101

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