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Kernel Live Patch Security Notice LSN-0092-1

Kernel Live Patch Security Notice LSN-0092-1
Posted Mar 8, 2023
Authored by Benjamin M. Romer

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. It was discovered that the NFSD implementation in the Linux kernel did not properly handle some RPC messages, leading to a buffer overflow. A remote attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

tags | advisory, remote, denial of service, overflow, arbitrary, kernel, local, vulnerability
systems | linux
advisories | CVE-2022-42896, CVE-2022-4378, CVE-2022-43945
SHA-256 | 6b28bba2254cc748657eeaf93b80b78ba2924b150021da014dcefa9c80762053

Kernel Live Patch Security Notice LSN-0092-1

Change Mirror Download
Linux kernel vulnerabilities

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- 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
- linux-oem - 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 the NFSD implementation in the Linux kernel did
not properly handle some RPC messages, leading to a buffer overflow. A
remote attacker could use this to cause a denial of service (system
crash) or possibly execute arbitrary code. (CVE-2022-43945)

Update instructions

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

Ubuntu 20.04 LTS
aws - 92.1
aws - 92.2
azure - 92.1
gcp - 92.1
gcp - 92.2
generic - 92.1
gke - 92.1
gke - 92.2
gkeop - 92.1
ibm - 92.1
lowlatency - 92.1

Ubuntu 18.04 LTS
aws - 92.1
azure - 92.1
gcp - 92.1
generic - 92.1
gke - 92.1
gkeop - 92.1
ibm - 92.1
lowlatency - 92.1
oem - 92.1

Ubuntu 16.04 ESM
aws - 92.1
azure - 92.1
gcp - 92.1
generic - 92.1
lowlatency - 92.1

Ubuntu 22.04 LTS
aws - 92.1
azure - 92.1
gcp - 92.1
generic - 92.1
gke - 92.1
ibm - 92.1
lowlatency - 92.1

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-2022-4378
- CVE-2022-42896
- CVE-2022-43945



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