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Ubuntu 20.04 LTS USN-4912-1 Critical: Kernel DoS Attacks Fixed

ubuntu
Calendar Grey April 13, 2021
Dist Ubuntu Esm H88
Multiple important kernel enhancements in Ubuntu 20.04 LTS address several service disruption vulnerabilities while improving overall system security.
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:

Piotr Krysiuk discovered that the BPF JIT compiler for x86 in the Linux

kernel did not properly validate computation of branch displacements in

some situations. A local attacker could use this to cause a denial of

service (system crash) or possibly execute arbitrary code. (CVE-2021-29154)

It was discovered that a race condition existed in the binder IPC

implementation in the Linux kernel, leading to a use-after-free

vulnerability. A local attacker could use this to cause a denial of service

(system crash) or possibly execute arbitrary code. (CVE-2020-0423)

It was discovered that the HID multitouch implementation within the Linux

kernel did not properly validate input events in some situations. A

physically proximate attacker could use this to cause a denial of service

(system crash) or possibly execute arbitrary code. (CVE-20...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical issue kernel update Ubuntu kernel ubuntu system crash security issues OEM systems

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.6.0-1053-oem      5.6.0-1053.57
  linux-image-oem-20.04           5.6.0.1053.49

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

CVE-2020-0423, CVE-2020-0465, CVE-2020-0466, CVE-2020-14351,

CVE-2020-14390, CVE-2020-25285, CVE-2020-25645, CVE-2020-25669,

CVE-2020-27830, CVE-2020-36158, CVE-2021-20194, CVE-2021-29154,

CVE-2021-3178, CVE-2021-3411

Severity
critical
Lowest
Low
Medium
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Critical

April 13, 2021

Topics%20covered

Topics Covered

security advisory denial of service critical issue kernel update Ubuntu kernel ubuntu system crash security issues OEM systems

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-5.6/5.6.0-1053.57

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