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Ubuntu 20.04 LTS: USN-4947-1 Critical: Kernel Update Denial Of Service

ubuntu
Calendar Grey May 11, 2021
Dist Ubuntu Esm H88
Dealing with various challenges in Ubuntu 20.04 LTS kernel while elucidating the updates. Make sure your system is fortified against vulnerabilities.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-oem-5.6: Linux kernel for OEM systems

Details:

Kiyin (尹亮) discovered that the x25 implementation in the Linux kernel

contained overflows when handling addresses from user space. A local

attacker could use this to cause a denial of service (system crash) or

possibly execute arbitrary code. (CVE-2020-35519)

It was discovered that the fastrpc driver in the Linux kernel did not

prevent user space applications from sending kernel RPC messages. A local

attacker could possibly use this to gain elevated privileges.

(CVE-2021-28375)

It was discovered that the TIPC protocol implementation in the Linux kernel

did not properly validate passed encryption key sizes. A local attacker

could use this to cause a denial of service (system crash).

(CVE-2021-29646)

It was discovered that a race condition existed in the netfilter subsystem

of the Linux kernel when replacing tables. A l...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel update privilege escalation ubuntu system crash linux-oem

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.6.0-1056-oem      5.6.0-1056.60
  linux-image-oem-20.04           5.6.0.1056.52

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-4947-1

CVE-2020-35519, CVE-2021-28375, CVE-2021-29646, CVE-2021-29650,

CVE-2021-30002

Severity
critical
Lowest
Low
Medium
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Critical

May 11, 2021

Topics%20covered

Topics Covered

security advisory denial of service kernel update privilege escalation ubuntu system crash linux-oem

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-5.6/5.6.0-1056.60

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