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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2023.0918
               LSN-0091-1: Kernel Live Patch Security Notice
                             16 February 2023

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Kernel
Publisher:         Ubuntu
Operating System:  Ubuntu
Resolution:        Patch/Upgrade
CVE Names:         CVE-2022-42719 CVE-2022-41222 

Original Bulletin: 
   https://ubuntu.com/security/notices/LSN-0091-1

Comment: CVSS (Max):  8.8 CVE-2022-42719 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
         CVSS Source: NVD
         Calculator:  https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

- --------------------------BEGIN INCLUDED TEXT--------------------

LSN-0091-1: Kernel Live Patch Security Notice

14 February 2023

Several security issues were fixed in the kernel.

Releases

  o Ubuntu 22.04 LTS
  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS

Software Description

  o aws - Linux kernel for Amazon Web Services (AWS) systems - (>= 5.4.0-1009,
    >= 5.4.0-1061, >= 5.15.0-1000)
  o aws-5.4 - Linux kernel for Amazon Web Services (AWS) systems - (>=
    5.4.0-1069)
  o azure - Linux kernel for Microsoft Azure Cloud systems - (>= 5.4.0-1010, >=
    5.15.0-1000)
  o azure-5.4 - Linux kernel for Microsoft Azure cloud systems - (>=
    5.4.0-1069)
  o gcp - Linux kernel for Google Cloud Platform (GCP) systems - (>=
    5.4.0-1009, >= 5.15.0-1000)
  o gcp-5.4 - Linux kernel for Google Cloud Platform (GCP) systems - (>=
    5.4.0-1069)
  o generic-5.4 - Linux kernel - (>= 5.4.0-26, >= 5.4.0-26)
  o gke - Linux kernel for Google Container Engine (GKE) systems - (>=
    5.4.0-1033, >= 5.15.0-1000)
  o gke-5.4 - Linux kernel for Google Container Engine (GKE) systems - (>=
    5.4.0-1009)
  o gkeop - Linux kernel for Google Container Engine (GKE) systems - (>=
    5.4.0-1009)
  o gkeop-5.4 - Linux kernel for Google Container Engine (GKE) systems - (>=
    5.4.0-1007)
  o ibm - Linux kernel for IBM cloud systems - (>= 5.4.0-1009, >= 5.15.0-1000)
  o ibm-5.4 - Linux kernel for IBM cloud systems - (>= 5.4.0-1009)
  o linux - Linux kernel - (>= 5.15.0-24)
  o lowlatency-5.4 - Linux kernel - (>= 5.4.0-26, >= 5.4.0-26)

Details

It was discovered that a race condition existed in the memory address space
accounting implementation 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-2022-41222 )

Sonke Huster discovered that a use-after-free vulnerability existed in the
WiFi driver stack in the Linux kernel. A physically proximate attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code.( CVE-2022-42719 )

Checking update status

The problem can be corrected in these Livepatch versions:

  Kernel type   22.04 20.04 18.04
aws             91.1  91.1  -
aws-5.4         -     -     91.1
azure           91.1  91.1  -
azure-5.4       -     -     91.1
gcp             91.1  91.1  -
gcp-5.4         -     -     91.1
generic-5.4     -     91.1  91.1
gke             91.1  91.1  -
gke-5.4         -     -     91.1
gkeop           -     91.1  -
gkeop-5.4       -     -     91.1
ibm             91.1  91.1  -
ibm-5.4         -     -     91.1
linux           91.1  -     -
lowlatency-5.4  -     91.1  91.1

To check your kernel type and Livepatch version, enter this command:

canonical-livepatch status

References

  o CVE-2022-42719
  o CVE-2022-41222

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