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Ubuntu 20.04 LTS: USN-5140-1 Critical: Linux Kernel Denial of Service

ubuntu
Calendar Grey November 11, 2021
Dist Ubuntu Esm H88
A number of security gaps within Ubuntu's linux-oem-5.14 were addressed. Make sure to apply system updates to avert possible risks.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-oem-5.14: Linux kernel for OEM systems

Details:

It was discovered that the AMD Cryptographic Coprocessor (CCP) driver in

the Linux kernel did not properly deallocate memory in some error

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

(memory exhaustion). (CVE-2021-3744, CVE-2021-3764)

It was discovered that an integer overflow could be triggered in the eBPF

implementation in the Linux kernel when preallocating objects for stack

maps. A privileged local attacker could use this to cause a denial of

service or possibly execute arbitrary code. (CVE-2021-41864)

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu memory exhaustion Linux kernel eBPF issue

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.14.0-1007-oem     5.14.0-1007.7
  linux-image-oem-20.04d          5.14.0.1007.7

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-5140-1

CVE-2021-3744, CVE-2021-3764, CVE-2021-41864

Severity
critical
Lowest
Low
Medium
High
Critical

November 11, 2021

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu memory exhaustion Linux kernel eBPF issue

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-5.14/5.14.0-1007.7

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