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USN-4591-1: Linux kernel vulnerabilities

19 October 2020

Several security issues were fixed in the Linux kernel.

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Releases

Packages

Details

Andy Nguyen discovered that the Bluetooth L2CAP implementation in the Linux
kernel contained a type-confusion error. A physically proximate remote
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2020-12351)

Andy Nguyen discovered that the Bluetooth A2MP implementation in the Linux
kernel did not properly initialize memory in some situations. A physically
proximate remote attacker could use this to expose sensitive information
(kernel memory). (CVE-2020-12352)

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

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

Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04

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.

References

Related notices

  • USN-4592-1: linux-image-oem-osp1, linux-image-5.0.0-1070-oem-osp1, linux-image-raspi2-hwe-18.04, linux-oem-osp1, linux-image-5.3.0-1036-raspi2, linux-raspi2-5.3
  • USN-4657-1: linux-image-kvm, linux-image-4.4.0-1142-raspi2, linux-image-4.4.0-197-generic, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc64-smp, linux-image-virtual-lts-vivid, linux, linux-image-generic-lpae-lts-vivid, linux-image-4.4.0-1082-aws, linux-image-powerpc-e500mc-lts-utopic, linux-image-4.4.0-1146-snapdragon, linux-image-powerpc-smp-lts-wily, linux-image-powerpc64-emb-lts-utopic, linux-image-virtual-lts-utopic, linux-image-4.4.0-1084-kvm, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc64-smp-lts-wily, linux-image-powerpc-e500mc-lts-wily, linux-image-powerpc64-emb-lts-xenial, linux-raspi2, linux-image-powerpc-smp-lts-vivid, linux-image-lowlatency-lts-xenial, linux-image-lowlatency-lts-wily, linux-image-4.4.0-197-powerpc-e500mc, linux-image-powerpc-e500mc, linux-snapdragon, linux-image-lowlatency, linux-image-snapdragon, linux-image-powerpc-smp, linux-lts-xenial, linux-image-generic-lpae, linux-image-powerpc64-smp-lts-vivid, linux-image-4.4.0-197-powerpc-smp, linux-image-4.4.0-197-generic-lpae, linux-image-generic-lpae-lts-utopic, linux-image-generic-lts-vivid, linux-image-powerpc-e500mc-lts-xenial, linux-image-virtual-lts-xenial, linux-image-generic-lts-utopic, linux-image-generic-lpae-lts-wily, linux-image-lowlatency-lts-utopic, linux-image-generic, linux-image-lowlatency-lts-vivid, linux-image-powerpc64-emb-lts-wily, linux-image-4.4.0-1118-aws, linux-image-raspi2, linux-image-powerpc-smp-lts-utopic, linux-image-virtual, linux-image-4.4.0-197-lowlatency, linux-image-aws, linux-image-powerpc-smp-lts-xenial, linux-kvm, linux-aws, linux-image-generic-lts-wily, linux-image-powerpc64-emb-lts-vivid, linux-image-powerpc64-smp-lts-utopic, linux-image-powerpc64-emb, linux-image-generic-lpae-lts-xenial, linux-image-generic-lts-xenial, linux-image-4.4.0-197-powerpc64-emb, linux-image-virtual-lts-wily, linux-image-4.4.0-197-powerpc64-smp
  • LSN-0073-1: aws, lowlatency-5.4, generic-4.15, lowlatency-4.15, oem, gcp, azure, generic-5.4
  • LSN-0074-1: gkeop, gkeop-5.4, generic-4.4, gke, aws, lowlatency-5.4, generic-4.15, aws-fips, lowlatency-4.4, lowlatency-4.15, oem, azure-fips, gcp, azure, fips, generic-5.4

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Further reading