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             AUSCERT External Security Bulletin Redistribution

              USN-5580-1: Linux kernel (AWS) vulnerabilities
                              26 August 2022


        AusCERT Security Bulletin Summary

Product:           Linux kernel (AWS)
Publisher:         Ubuntu
Operating System:  Ubuntu
Resolution:        Patch/Upgrade
CVE Names:         CVE-2022-36946 CVE-2022-20368 CVE-2021-33656

Original Bulletin: 

Comment: CVSS (Max):  9.8 CVE-2022-20368 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
         CVSS Source: [NVD], Red Hat
         Calculator:  https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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USN-5580-1: Linux kernel (AWS) vulnerabilities
24 August 2022

Several security issues were fixed in the Linux kernel.

  o Ubuntu 16.04 ESM


  o linux-aws - Linux kernel for Amazon Web Services (AWS) systems


It was discovered that the framebuffer driver on the Linux kernel did not
verify size limits when changing font or screen size, leading to an out-of-
bounds write. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. ( CVE-2021-33655 )

It was discovered that the virtual terminal driver in the Linux kernel did
not properly handle VGA console font changes, leading to an out-of-bounds
write. A local attacker could use this to cause a denial of service (system
crash) or possibly execute arbitrary code. ( CVE-2021-33656 )

It was discovered that the Packet network protocol implementation in the
Linux kernel contained an out-of-bounds access. A remote attacker could use
this to expose sensitive information (kernel memory). ( CVE-2022-20368 )

Domingo Dirutigliano and Nicola Guerrera discovered that the netfilter
subsystem in the Linux kernel did not properly handle rules that truncated
packets below the packet header size. When such rules are in place, a
remote attacker could possibly use this to cause a denial of service
(system crash). ( CVE-2022-36946 )

Update instructions

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

Ubuntu 16.04

  o linux-image-4.4.0-1150-aws - 4.4.0-1150.165
    Available with UA Infra or UA Desktop
  o linux-image-aws -
    Available with UA Infra or UA Desktop

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.


  o CVE-2022-36946
  o CVE-2021-33656
  o CVE-2021-33655
  o CVE-2022-20368

Related notices

  o USN-5577-1 : linux-modules-iwlwifi-5.14.0-1049-oem, linux-image-oem-20.04b,
    linux-modules-5.14.0-1049-oem, linux-headers-5.14.0-1049-oem,
    linux-buildinfo-5.14.0-1049-oem, linux-tools-oem-20.04,
    linux-oem-5.14-tools-5.14.0-1049, linux-image-oem-20.04d,
    linux-headers-oem-20.04d, linux-image-oem-20.04c,
    linux-image-unsigned-5.14.0-1049-oem, linux-oem-20.04d,
    linux-tools-oem-20.04d, linux-headers-oem-20.04c, linux-headers-oem-20.04b,
    linux-image-5.14.0-1049-oem, linux-oem-5.14-headers-5.14.0-1049,
    linux-oem-20.04c, linux-tools-5.14.0-1049-oem, linux-oem-20.04,
    linux-tools-oem-20.04c, linux-modules-iwlwifi-oem-20.04, linux-oem-20.04b,
    linux-tools-oem-20.04b, linux-image-oem-20.04, linux-oem-5.14-tools-host,
    linux-modules-iwlwifi-oem-20.04d, linux-headers-oem-20.04, linux-oem-5.14

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