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Ubuntu Security Notice USN-5814-1 ≈ Mobile Hacker For Hire

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Ubuntu Security Notice USN-5814-1
January 19, 2023

linux-azure, linux-gkeop, linux-intel-iotg, linux-lowlatency,
linux-lowlatency-hwe-5.15, linux-oracle-5.15 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

– Ubuntu 22.10
– Ubuntu 22.04 LTS
– Ubuntu 20.04 LTS


Several security issues were fixed in the Linux kernel.

Software Description:
– linux-azure: Linux kernel for Microsoft Azure Cloud systems
– linux-lowlatency: Linux low latency kernel
– linux-gkeop: Linux kernel for Google Container Engine (GKE) systems
– linux-intel-iotg: Linux kernel for Intel IoT platforms
– linux-lowlatency-hwe-5.15: Linux low latency kernel
– linux-oracle-5.15: Linux kernel for Oracle Cloud systems


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.

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 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).

Update instructions:

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

Ubuntu 22.10:
linux-image-5.19.0-1015-lowlatency 5.19.0-1015.16
linux-image-5.19.0-1015-lowlatency-64k 5.19.0-1015.16
linux-image-5.19.0-1017-azure 5.19.0-1017.18

Ubuntu 22.04 LTS:
linux-image-5.15.0-1013-gkeop 5.15.0-1013.17
linux-image-5.15.0-1023-intel-iotg 5.15.0-1023.28
linux-image-5.15.0-58-lowlatency 5.15.0-58.64
linux-image-5.15.0-58-lowlatency-64k 5.15.0-58.64

Ubuntu 20.04 LTS:
linux-image-5.15.0-1027-oracle 5.15.0-1027.33~20.04.1
linux-image-5.15.0-58-lowlatency 5.15.0-58.64~20.04.1
linux-image-5.15.0-58-lowlatency-64k 5.15.0-58.64~20.04.1

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.

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

Package Information:

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