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Ubuntu 22.04 LTS USN-5831-1 Critical: Kernel Buffer Overflows and DoS

ubuntu
Calendar Grey January 27, 2023
Dist Ubuntu Esm H88
Multiple serious security flaws were patched in the Ubuntu Linux kernel designed for Azure Cloud Virtual Machines; make sure to upgrade your system.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure-fde: Linux kernel for Microsoft Azure CVM cloud systems

Details:

Kyle Zeng discovered that the sysctl implementation in the Linux kernel

contained a stack-based buffer overflow. A local attacker could use this to

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

(CVE-2022-4378)

Tamás Koczka discovered that the Bluetooth L2CAP handshake implementation

in the Linux kernel contained multiple use-after-free vulnerabilities. A

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

(system crash) or possibly execute arbitrary code. (CVE-2022-42896)

It was discovered that the Xen netback driver in the Linux kernel did not

properly handle packets structured in certain ways. An attacker in a guest

VM could possibly use this to cause a denial of service (host NIC

availability). (CVE-2022-3643)

It was discovered that an integer overflow...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow kernel update instructions ubuntu linux-azure-fde

Update Instructions

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

Ubuntu 22.04 LTS:
   linux-image-5.15.0-1031-azure-fde  5.15.0-1031.38.1
   linux-image-azure-fde           5.15.0.1031.38.8

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-5831-1

CVE-2022-3643, CVE-2022-42896, CVE-2022-4378, CVE-2022-45934

Severity
critical
Lowest
Low
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Critical

January 27, 2023

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow kernel update instructions ubuntu linux-azure-fde

Package Information

https://launchpad.net/ubuntu/+source/linux-azure-fde/5.15.0-1031.38.1

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