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Ubuntu 20.04 LTS: USN-4752-1 Critical Kernel Security Issues

ubuntu
Calendar Grey February 25, 2021
Dist Ubuntu Esm H88
A series of critical issues have been discovered within Ubuntu's Linux kernel, necessitating immediate attention to avert potential system instability and security threats.
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:

Daniele Antonioli, Nils Ole Tippenhauer, and Kasper Rasmussen discovered

that legacy pairing and secure-connections pairing authentication in the

Bluetooth protocol could allow an unauthenticated user to complete

authentication without pairing credentials via adjacent access. A

physically proximate attacker could use this to impersonate a previously

paired Bluetooth device. (CVE-2020-10135)

Jay Shin discovered that the ext4 file system implementation in the Linux

kernel did not properly handle directory access with broken indexing,

leading to an out-of-bounds read vulnerability. A local attacker could use

this to cause a denial of service (system crash). (CVE-2020-14314)

It was discovered that the block layer implementation in the Linux kernel

did not properly perform reference counting in some situations, leading to

a use-a...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu authentication issue kernel authentication system crash Bluetooth Bluetooth issue

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.6.0-1048-oem      5.6.0-1048.52
  linux-image-oem-20.04           5.6.0.1048.44

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-4752-1

CVE-2020-10135, CVE-2020-14314, CVE-2020-15436, CVE-2020-15437,

CVE-2020-24490, CVE-2020-25212, CVE-2020-25284, CVE-2020-25641,

CVE-2020-25643, CVE-2020-25704, CVE-2020-27152, CVE-2020-27815,

CVE-2020-28588, CVE-2020-28915, CVE-2020-29368, CVE-2020-29369,

CVE-2020-29371, CVE-2020-29660, CVE-2020-29661, CVE-2020-35508

Severity
critical
Lowest
Low
Medium
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Critical

February 25, 2021

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu authentication issue kernel authentication system crash Bluetooth Bluetooth issue

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-5.6/5.6.0-1048.52

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