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Ubuntu 18.04: USN-5073-3 High Severity: Kernel DoS Threats Resolved

ubuntu
Calendar Grey September 21, 2021
Dist Ubuntu Esm H88
Numerous vulnerabilities resolved in Ubuntu's linux-raspi2 kernel; critical updates necessitate a system reboot after installation.
Several security issues were fixed in the Linux kernel.

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)

Topics%20covered

Topics Covered

security advisory denial of service high severity security issue linux kernel raspberry pi

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

September 22, 2021

Topics%20covered

Topics Covered

security advisory denial of service high severity security issue linux kernel raspberry pi

Package Information

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

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