USN-4592-1: Linux kernel vulnerabilities

Releases

• Ubuntu 18.04 ESM

Packages

• linux-oem-osp1 - Linux kernel for OEM systems
• linux-raspi2-5.3 - Linux kernel for Raspberry Pi (V8) systems

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)

Andy Nguyen discovered that the Bluetooth HCI event packet parser in the
Linux kernel did not properly handle event advertisements of certain sizes,
leading to a heap-based buffer overflow. A physically proximate remote
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2020-24490)

Update instructions

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

Ubuntu 18.04

• linux-image-5.0.0-1070-oem-osp1 - 5.0.0-1070.76
• linux-image-5.3.0-1036-raspi2 - 5.3.0-1036.38
• linux-image-oem-osp1 - 5.0.0.1070.68
• linux-image-raspi2-hwe-18.04 - 5.3.0.1036.25

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

• CVE-2020-12351
• CVE-2020-24490
• CVE-2020-12352

Related notices

• USN-4591-1: linux-image-4.15.0-122-lowlatency, linux-image-generic-lpae-hwe-18.04-edge, linux-raspi, linux-image-virtual, linux-image-5.4.0-52-lowlatency, linux-image-oem, linux-image-snapdragon-hwe-18.04-edge, linux-oem, linux-image-lowlatency-hwe-18.04-edge, linux-image-generic-hwe-18.04-edge, linux-image-4.15.0-122-generic-lpae, linux-image-generic-lpae-hwe-20.04, linux-image-virtual-hwe-16.04-edge, linux-image-lowlatency-hwe-18.04, linux-image-generic-hwe-16.04-edge, linux-image-virtual-hwe-20.04, linux-image-generic-hwe-20.04, linux-image-virtual-hwe-18.04-edge, linux-image-raspi2-hwe-18.04, linux-image-lowlatency, linux-image-virtual-hwe-16.04, linux-image-5.4.0-52-generic, linux-image-raspi-hwe-18.04-edge, linux-image-5.4.0-52-generic-lpae, linux, linux-image-lowlatency-hwe-16.04-edge, linux-image-generic, linux-image-virtual-hwe-18.04, linux-image-oem-osp1, linux-image-lowlatency-hwe-16.04, linux-image-5.4.0-1022-raspi, linux-image-generic-lpae-hwe-18.04, linux-snapdragon, linux-image-generic-lpae-hwe-16.04, linux-hwe-5.4, linux-image-4.15.0-1090-snapdragon, linux-image-raspi2-hwe-18.04-edge, linux-raspi-5.4, linux-image-raspi-hwe-18.04, linux-image-raspi2, linux-hwe, linux-image-lowlatency-hwe-20.04, linux-image-generic-lpae-hwe-16.04-edge, linux-image-generic-hwe-18.04, linux-image-4.15.0-122-generic, linux-image-generic-hwe-16.04, linux-image-generic-lpae, linux-image-raspi, linux-image-snapdragon, linux-image-snapdragon-hwe-18.04, linux-image-4.15.0-1100-oem
• LSN-0073-1: generic-5.4, aws, lowlatency-5.4, lowlatency-4.15, azure, generic-4.15, gcp, oem
• USN-4752-1: linux-image-oem-20.04, linux-oem-5.6, linux-image-5.6.0-1048-oem
• USN-4657-1: linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-197-generic, linux-image-powerpc-e500mc-lts-xenial, linux-image-powerpc64-smp, linux-image-4.4.0-197-lowlatency, linux-image-virtual, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc64-smp-lts-utopic, linux-image-powerpc-smp-lts-wily, linux-image-4.4.0-1082-aws, linux-image-4.4.0-197-generic-lpae, linux-image-powerpc64-smp-lts-wily, linux-image-powerpc64-smp-lts-vivid, linux-image-generic-lpae-lts-utopic, linux-image-powerpc-smp-lts-utopic, linux-image-generic-lts-utopic, linux-image-4.4.0-1084-kvm, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc-e500mc, linux-image-generic-lpae-lts-vivid, linux-image-4.4.0-1142-raspi2, linux-image-4.4.0-197-powerpc64-smp, linux-image-lowlatency, linux-image-powerpc64-emb-lts-vivid, linux-kvm, linux-image-generic-lts-wily, linux-raspi2, linux-image-4.4.0-1118-aws, linux-image-generic-lts-vivid, linux-image-lowlatency-lts-utopic, linux-image-powerpc-smp-lts-vivid, linux-image-4.4.0-197-powerpc-e500mc, linux-image-virtual-lts-vivid, linux-image-powerpc64-emb, linux, linux-image-4.4.0-197-powerpc-smp, linux-image-aws, linux-image-powerpc64-emb-lts-utopic, linux-image-generic, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc-smp-lts-xenial, linux-lts-xenial, linux-image-powerpc-smp, linux-snapdragon, linux-image-powerpc64-emb-lts-wily, linux-image-lowlatency-lts-vivid, linux-image-generic-lts-xenial, linux-image-virtual-lts-utopic, linux-image-raspi2, linux-image-snapdragon, linux-image-generic-lpae-lts-wily, linux-image-kvm, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-1146-snapdragon, linux-image-generic-lpae, linux-image-lowlatency-lts-wily, linux-image-powerpc-e500mc-lts-utopic, linux-image-4.4.0-197-powerpc64-emb, linux-image-virtual-lts-xenial, linux-aws, linux-image-powerpc-e500mc-lts-wily, linux-image-virtual-lts-wily
• LSN-0074-1: generic-5.4, generic-4.4, gkeop, aws, gkeop-5.4, lowlatency-4.4, lowlatency-5.4, gke, lowlatency-4.15, azure, aws-fips, fips, azure-fips, generic-4.15, gcp, oem