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Ubuntu 20.04 LTS USN-4983-1 Critical: Linux Kernel Denial of Service

ubuntu
Calendar Grey June 3, 2021
Dist Ubuntu Esm H88
Uncover the newest security notice from Ubuntu regarding kernel vulnerabilities that may trigger system failures or risk leakage of confidential information.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-oem-5.10: Linux kernel for OEM systems

Details:

Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel

did not properly enforce limits for pointer operations. A local attacker

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

execute arbitrary code. (CVE-2021-33200)

Piotr Krysiuk and Benedict Schlueter discovered that the eBPF

implementation in the Linux kernel performed out of bounds speculation on

pointer arithmetic. A local attacker could use this to expose sensitive

information. (CVE-2021-29155)

Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel

did not properly prevent speculative loads in certain situations. A local

attacker could use this to expose sensitive information (kernel memory).

(CVE-2021-31829)

Reiji Watanabe discovered that the KVM VMX implementation in the Linux

kernel did not properly prevent user space from ta...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service security issue critical kernel ubuntu oem

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.10.0-1029-oem     5.10.0-1029.30
  linux-image-oem-20.04           5.10.0.1029.30
  linux-image-oem-20.04b          5.10.0.1029.30

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-4983-1

CVE-2021-29155, CVE-2021-31829, CVE-2021-33200, CVE-2021-3501

Severity
critical
Lowest
Low
Medium
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Critical

June 03, 2021

Topics%20covered

Topics Covered

security advisory denial of service security issue critical kernel ubuntu oem

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-5.10/5.10.0-1029.30

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