Kernel Live Patch Security Notice LSN-0090-1

Linux kernel vulnerabilities

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

– Ubuntu 20.04 LTS
– Ubuntu 18.04 LTS
– Ubuntu 22.04 LTS

Summary

Several security issues were fixed in the kernel.

Software Description

– linux – Linux kernel
– linux-aws – Linux kernel for Amazon Web Services (AWS) systems
– linux-azure – Linux kernel for Microsoft Azure Cloud systems
– linux-gcp – Linux kernel for Google Cloud Platform (GCP) systems
– linux-gke – Linux kernel for Google Container Engine (GKE) systems
– linux-gkeop – Linux kernel for Google Container Engine (GKE) systems
– linux-ibm – Linux kernel for IBM cloud systems

Details

David Bouman discovered that the netfilter subsystem in the Linux kernel
did not properly validate passed user register indices. A local attacker
could use this to cause a denial of service or possibly execute
arbitrary code. (CVE-2022-1015)

David Bouman and Billy Jheng Bing Jhong discovered that a race condition
existed in the io_uring subsystem in the Linux kernel, 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-2022-2602)

Sönke Huster discovered that an integer overflow vulnerability existed
in the WiFi driver stack in the Linux kernel, leading to a buffer
overflow. A physically proximate attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2022-41674)

Sönke Huster discovered that the WiFi driver stack in the Linux kernel did
not properly perform reference counting in some situations, leading to a
use-after-free vulnerability. A physically proximate attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2022-42720)

Sönke Huster discovered that the WiFi driver stack in the Linux kernel did
not properly handle BSSID/SSID lists in some situations. A physically
proximate attacker could use this to cause a denial of service (infinite
loop). (CVE-2022-42721)

Sönke Huster discovered that the WiFi driver stack in the Linux kernel
contained a NULL pointer dereference vulnerability in certain situations. A
physically proximate attacker could use this to cause a denial of service
(system crash). (CVE-2022-42722)

Update instructions

The problem can be corrected by updating your kernel livepatch to the
following versions:

Ubuntu 20.04 LTS
aws – 90.2
aws – 90.3
azure – 90.2
gcp – 90.2
gcp – 90.3
generic – 90.2
gke – 90.2
gke – 90.3
gkeop – 90.2
ibm – 90.2
lowlatency – 90.2

Ubuntu 18.04 LTS
aws – 90.2
azure – 90.2
gcp – 90.2
generic – 90.2
gke – 90.2
gkeop – 90.2
ibm – 90.2
lowlatency – 90.2

Ubuntu 22.04 LTS
aws – 90.1
aws – 90.2
azure – 90.1
azure – 90.2
gcp – 90.1
gcp – 90.2
generic – 90.2
gke – 90.1
gke – 90.2
ibm – 90.1
ibm – 90.2
lowlatency – 90.2

Support Information

Kernels older than the levels listed below do not receive livepatch
updates. If you are running a kernel version earlier than the one listed
below, please upgrade your kernel as soon as possible.

Ubuntu 20.04 LTS
linux-aws-5.15 – 5.15.0-1000
linux-aws – 5.4.0-1009
linux-aws – 5.4.0-1061
linux-azure-5.15 – 5.15.0-1069
linux-azure – 5.4.0-1010
linux-gcp-5.15 – 5.15.0-1000
linux-gcp – 5.4.0-1009
linux-gke-5.15 – 5.15.0-1000
linux-gke – 5.4.0-1033
linux-gkeop – 5.4.0-1009
linux-hwe – 5.15.0-0
linux-ibm-5.15 – 5.15.0-1000
linux-ibm – 5.4.0-1009
linux-oem – 5.4.0-26
linux – 5.4.0-26

Ubuntu 18.04 LTS
linux-aws-5.4 – 5.4.0-1069
linux-aws – 4.15.0-1054
linux-aws – 4.15.0-1119
linux-azure-4.15 – 4.15.0-1115
linux-azure-5.4 – 5.4.0-1069
linux-gcp-4.15 – 4.15.0-1121
linux-gcp-5.4 – 5.4.0-1069
linux-gke-4.15 – 4.15.0-1076
linux-gke-5.4 – 5.4.0-1009
linux-gkeop-5.4 – 5.4.0-1007
linux-hwe-5.4 – 5.4.0-26
linux-ibm-5.4 – 5.4.0-1009
linux-oem – 4.15.0-1063
linux – 4.15.0-69

Ubuntu 16.04 ESM
linux-aws-hwe – 4.15.0-1126
linux-aws – 4.4.0-1098
linux-aws – 4.4.0-1129
linux-azure – 4.15.0-1063
linux-azure – 4.15.0-1078
linux-azure – 4.15.0-1114
linux-gcp – 4.15.0-1118
linux-hwe – 4.15.0-143
linux-hwe – 4.15.0-69
linux – 4.4.0-168
linux – 4.4.0-211

Ubuntu 22.04 LTS
linux-aws – 5.15.0-1000
linux-azure – 5.15.0-1000
linux-gcp – 5.15.0-1000
linux-gke – 5.15.0-1000
linux-ibm – 5.15.0-1000
linux – 5.15.0-24
linux – 5.15.0-25

Ubuntu 14.04 ESM
linux-lts-xenial – 4.4.0-168

References

– CVE-2022-1015
– CVE-2022-2602
– CVE-2022-41674
– CVE-2022-42720
– CVE-2022-42721
– CVE-2022-42722