Explore top 10 tips to secure your open-source projects now. Read More

×
Alerts This Week
Warning Icon 1 556
Alerts This Week
Warning Icon 1 556

Ubuntu 20.04 LTS: USN-4884-1 Critical DoS Issues and Fixes

ubuntu
Calendar Grey March 20, 2021
Dist Ubuntu Esm H88
Multiple vulnerabilities identified in the Ubuntu Linux kernel have been addressed. Upgrade your system to protect against 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-5.10: Linux kernel for OEM systems

Details:

Loris Reiff discovered that the BPF implementation in the Linux kernel did

not properly validate attributes in the getsockopt BPF hook. A local

attacker could possibly use this to cause a denial of service (system

crash). (CVE-2021-20194)

It was discovered that the priority inheritance futex implementation in the

Linux kernel contained a race condition, 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-2021-3347)

It was discovered that the network block device (nbd) driver in the Linux

kernel contained a use-after-free vulnerability during device setup. A

local attacker with access to the nbd device could use this to cause a

denial of service (system crash) or possibly execute arbitrary code.

(CVE-2021-3348)

Topics%20covered

Topics Covered

security advisory critical code execution DoS Ubuntu kernel system crash

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.10.0-1017-oem     5.10.0-1017.18
  linux-image-oem-20.04b          5.10.0.1017.18

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-4884-1

CVE-2021-20194, CVE-2021-3347, CVE-2021-3348

Severity
critical
Lowest
Low
Medium
High
Critical

March 20, 2021

Topics%20covered

Topics Covered

security advisory critical code execution DoS Ubuntu kernel system crash

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-5.10/5.10.0-1017.18

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.