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Ubuntu 20.04 LTS USN-5809-1 Critical: Linux Kernel Buffer Overflow

ubuntu
Calendar Grey January 17, 2023
Dist Ubuntu Esm H88
Ubuntu 20.04 LTS receives critical patches addressing OEM kernel vulnerabilities, such as potential denial of service and risks of arbitrary code execution.
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:

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 an integer overflow vulnerability existed in the

Bluetooth subsystem in the Linux kernel. A physically proximate attacker

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

(CVE-2022-45934)

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow ubuntu system crash linux kernel bluetooth issue

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.14.0-1056-oem     5.14.0-1056.63
   linux-image-oem-20.04           5.14.0.1056.54
   linux-image-oem-20.04b          5.14.0.1056.54
   linux-image-oem-20.04c          5.14.0.1056.54
   linux-image-oem-20.04d          5.14.0.1056.54

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-5809-1

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

Severity
critical
Lowest
Low
Medium
High
Critical

January 17, 2023

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow ubuntu system crash linux kernel bluetooth issue

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-5.14/5.14.0-1056.63

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