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Ubuntu 20.04 LTS USN-5015-1 Critical: Kernel Denial Of Service Threats

ubuntu
Calendar Grey July 20, 2021
Dist Ubuntu Esm H88
A series of vulnerabilities in the linux-oem-5.10 kernel for Ubuntu has been addressed, rectifying urgent threats that jeopardized the system's integrity.
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:

It was discovered that the virtual file system implementation in the Linux

kernel contained an unsigned to signed integer conversion error. A local

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

execute arbitrary code. (CVE-2021-33909)

Michael Brown discovered that the Xen netback driver in the Linux kernel

did not properly handle malformed packets from a network PV frontend,

leading to a use-after-free vulnerability. An attacker in a guest VM could

use this to cause a denial of service or possibly execute arbitrary code.

(CVE-2021-28691)

It was discovered that the bluetooth subsystem in the Linux kernel did not

properly handle HCI device initialization failure, leading to a double-free

vulnerability. An attacker could use this to cause a denial of service or

possibly execute arbitrary code. (CVE-2021-3564)

It was discov...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical threat ubuntu linux kernel oem

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.10.0-1038-oem     5.10.0-1038.40
  linux-image-oem-20.04           5.10.0.1038.40
  linux-image-oem-20.04b          5.10.0.1038.40

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-5015-1

CVE-2021-28691, CVE-2021-33909, CVE-2021-3564, CVE-2021-3573,

CVE-2021-3587

Severity
critical
Lowest
Low
Medium
High
Critical

July 20, 2021

Topics%20covered

Topics Covered

security advisory denial of service critical threat ubuntu linux kernel oem

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-5.10/5.10.0-1038.40

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