USN-4659-1: Linux kernel vulnerabilities

Releases

• Ubuntu 20.10

Packages

• 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-kvm - Linux kernel for cloud environments
• linux-oracle - Linux kernel for Oracle Cloud systems
• linux-raspi - Linux kernel for Raspberry Pi (V8) systems

Details

It was discovered that a race condition existed in the binder IPC
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-2020-0423)

Daniele Antonioli, Nils Ole Tippenhauer, and Kasper Rasmussen discovered
that legacy pairing and secure-connections pairing authentication in the
Bluetooth protocol could allow an unauthenticated user to complete
authentication without pairing credentials via adjacent access. A
physically proximate attacker could use this to impersonate a previously
paired Bluetooth device. (CVE-2020-10135)

It was discovered that a race condition existed in the perf subsystem of
the Linux kernel, leading to a use-after-free vulnerability. An attacker
with access to the perf subsystem could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2020-14351)

Keyu Man discovered that the ICMP global rate limiter in the Linux kernel
could be used to assist in scanning open UDP ports. A remote attacker could
use to facilitate attacks on UDP based services that depend on source port
randomization. (CVE-2020-25705)

It was discovered that the KVM hypervisor in the Linux kernel did not
properly handle interrupts in certain situations. A local attacker in a
guest VM could possibly use this to cause a denial of service (host system
crash). (CVE-2020-27152)

It was discovered that the framebuffer implementation in the Linux kernel
did not properly perform range checks in certain situations. A local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2020-28915)

It was discovered that Power 9 processors could be coerced to expose
information from the L1 cache in certain situations. A local attacker could
use this to expose sensitive information. (CVE-2020-4788)

Update instructions

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

Ubuntu 20.10

• linux-image-5.8.0-1008-raspi - 5.8.0-1008.11
• linux-image-5.8.0-1008-raspi-nolpae - 5.8.0-1008.11
• linux-image-5.8.0-1011-kvm - 5.8.0-1011.12
• linux-image-5.8.0-1011-oracle - 5.8.0-1011.11
• linux-image-5.8.0-1012-gcp - 5.8.0-1012.12
• linux-image-5.8.0-1013-azure - 5.8.0-1013.14
• linux-image-5.8.0-1014-aws - 5.8.0-1014.15
• linux-image-5.8.0-31-generic - 5.8.0-31.33
• linux-image-5.8.0-31-generic-64k - 5.8.0-31.33
• linux-image-5.8.0-31-generic-lpae - 5.8.0-31.33
• linux-image-5.8.0-31-lowlatency - 5.8.0-31.33
• linux-image-aws - 5.8.0.1014.16
• linux-image-azure - 5.8.0.1013.13
• linux-image-gcp - 5.8.0.1012.12
• linux-image-generic - 5.8.0.31.36
• linux-image-generic-64k - 5.8.0.31.36
• linux-image-generic-lpae - 5.8.0.31.36
• linux-image-gke - 5.8.0.1012.12
• linux-image-kvm - 5.8.0.1011.12
• linux-image-lowlatency - 5.8.0.31.36
• linux-image-oem-20.04 - 5.8.0.31.36
• linux-image-oracle - 5.8.0.1011.11
• linux-image-raspi - 5.8.0.1008.11
• linux-image-raspi-nolpae - 5.8.0.1008.11
• linux-image-virtual - 5.8.0.31.36

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-2020-28915
• CVE-2020-4788
• CVE-2020-10135
• CVE-2020-25705
• CVE-2020-27152
• CVE-2020-0423
• CVE-2020-14351

Related notices

• USN-4657-1: linux-image-aws, linux-image-4.4.0-1146-snapdragon, linux-image-virtual-lts-wily, linux-image-4.4.0-197-generic, linux-image-snapdragon, linux-kvm, linux-image-raspi2, linux-image-4.4.0-1118-aws, linux-image-4.4.0-197-powerpc64-emb, linux-image-powerpc64-smp, linux-image-4.4.0-1142-raspi2, linux-image-powerpc64-emb-lts-wily, linux-image-powerpc-smp-lts-utopic, linux-image-powerpc-e500mc-lts-vivid, linux-image-4.4.0-197-powerpc64-smp, linux-raspi2, linux-image-generic-lpae-lts-vivid, linux-image-generic, linux-image-powerpc64-emb, linux-image-generic-lpae-lts-utopic, linux-image-powerpc64-smp-lts-wily, linux-image-4.4.0-197-powerpc-smp, linux-image-generic-lpae-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-image-lowlatency-lts-vivid, linux-image-powerpc-smp-lts-vivid, linux-image-lowlatency, linux-image-powerpc-e500mc, linux-image-powerpc64-smp-lts-utopic, linux-image-lowlatency-lts-xenial, linux-image-powerpc64-smp-lts-vivid, linux-image-virtual-lts-utopic, linux-image-virtual-lts-xenial, linux-image-4.4.0-1084-kvm, linux-image-virtual-lts-vivid, linux-image-powerpc-smp, linux-image-powerpc64-emb-lts-vivid, linux-image-lowlatency-lts-wily, linux-image-4.4.0-197-powerpc-e500mc, linux-image-generic-lts-vivid, linux-image-powerpc-smp-lts-wily, linux-image-4.4.0-197-lowlatency, linux-image-generic-lts-wily, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-1082-aws, linux-image-generic-lpae, linux-image-lowlatency-lts-utopic, linux-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-generic-lts-xenial, linux-image-generic-lpae-lts-wily, linux-aws, linux-image-generic-lts-utopic, linux-image-powerpc-e500mc-lts-wily, linux-image-powerpc64-emb-lts-utopic, linux, linux-image-powerpc64-emb-lts-xenial, linux-image-4.4.0-197-generic-lpae, linux-snapdragon, linux-image-virtual, linux-image-kvm
• USN-4658-1: linux-image-5.4.0-1023-raspi, linux-image-aws, linux-kvm, linux-image-raspi2, linux-image-generic-hwe-18.04, linux-image-lowlatency-hwe-20.04, linux-raspi-5.4, linux-image-5.4.0-1030-gcp, linux-image-5.4.0-56-lowlatency, linux-azure-5.4, linux-image-aws-edge, linux-image-raspi2-hwe-18.04-edge, linux-image-oem, linux-image-lowlatency-hwe-18.04-edge, linux-oracle, linux-image-generic-hwe-18.04-edge, linux-image-5.4.0-1030-oracle, linux-image-generic, linux-image-generic-lpae-hwe-20.04, linux-image-5.4.0-56-generic-lpae, linux-image-raspi, linux-image-lowlatency-hwe-18.04, linux-image-lowlatency, linux-image-5.4.0-1032-azure, linux-gcp-5.4, linux-image-oem-osp1, linux-image-5.4.0-56-generic, linux-aws-5.4, linux-image-gcp, linux-raspi, linux-image-virtual-hwe-20.04, linux-image-raspi-hwe-18.04, linux-image-azure-edge, linux-image-5.4.0-1030-aws, linux-image-snapdragon-hwe-18.04-edge, linux-image-gke, linux-image-generic-hwe-20.04, linux-image-snapdragon-hwe-18.04, linux-image-generic-lpae-hwe-18.04, linux-image-raspi2-hwe-18.04, linux-image-virtual-hwe-18.04, linux-image-generic-lpae, linux-gcp, linux-image-gcp-edge, linux-image-raspi-hwe-18.04-edge, linux-image-azure, linux-image-virtual-hwe-18.04-edge, linux-aws, linux-hwe-5.4, linux-image-oracle, linux-image-5.4.0-1028-kvm, linux, linux-azure, linux-image-generic-lpae-hwe-18.04-edge, linux-image-virtual, linux-oracle-5.4, linux-image-oracle-edge, linux-image-kvm
• USN-4660-1: linux-image-snapdragon, linux-kvm, linux-image-4.15.0-126-lowlatency, linux-image-4.15.0-1103-oem, linux-image-raspi2, linux-image-4.15.0-126-generic, linux-snapdragon, linux-image-lowlatency-hwe-16.04, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-1074-raspi2, linux-aws-hwe, linux-gcp-4.15, linux-image-lowlatency-hwe-16.04-edge, linux-image-oem, linux-image-4.15.0-1074-gke, linux-image-4.15.0-1091-snapdragon, linux-image-4.15.0-1088-aws, linux-raspi2, linux-oracle, linux-image-generic, linux-image-virtual-hwe-16.04-edge, linux-image-4.15.0-1100-azure, linux-image-4.15.0-1059-oracle, linux-image-azure-lts-18.04, linux-image-lowlatency, linux-image-gcp-lts-18.04, linux-image-aws-lts-18.04, linux-oem, linux-image-gcp, linux-image-gke-4.15, linux-hwe, linux-image-generic-hwe-16.04, linux-image-generic-hwe-16.04-edge, linux-image-azure-edge, linux-image-generic-lpae-hwe-16.04-edge, linux-image-aws-hwe, linux-image-oracle-lts-18.04, linux-image-gke, linux-azure-4.15, linux-image-generic-lpae, linux-image-4.15.0-1079-kvm, linux-gcp, linux-image-azure, linux-aws, linux-image-oracle, linux, linux-azure, linux-image-4.15.0-1088-gcp, linux-image-virtual-hwe-16.04, linux-image-4.15.0-126-generic-lpae, linux-image-virtual, linux-image-kvm, linux-gke-4.15
• USN-4752-1: linux-oem-5.6, linux-image-5.6.0-1048-oem, linux-image-oem-20.04
• USN-4681-1: linux-image-aws, linux-image-virtual-lts-wily, linux-image-4.4.0-198-powerpc-smp, linux-image-4.4.0-198-generic-lpae, linux-image-snapdragon, linux-kvm, linux-image-4.4.0-1083-aws, linux-image-raspi2, linux-image-4.4.0-1143-raspi2, linux-image-powerpc64-smp, linux-image-powerpc64-emb-lts-wily, linux-image-powerpc-smp-lts-utopic, linux-image-powerpc-e500mc-lts-vivid, linux-raspi2, linux-image-generic-lpae-lts-vivid, linux-image-generic, linux-image-powerpc64-emb, linux-image-generic-lpae-lts-utopic, linux-image-4.4.0-198-powerpc64-emb, linux-image-powerpc64-smp-lts-wily, linux-image-generic-lpae-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-image-lowlatency-lts-vivid, linux-image-4.4.0-198-powerpc-e500mc, linux-image-powerpc-smp-lts-vivid, linux-image-lowlatency, linux-image-4.4.0-1085-kvm, linux-image-4.4.0-198-powerpc64-smp, linux-image-lowlatency-lts-xenial, linux-image-powerpc-e500mc, linux-image-4.4.0-1147-snapdragon, linux-image-4.4.0-198-generic, linux-image-powerpc64-smp-lts-utopic, linux-image-powerpc64-smp-lts-vivid, linux-image-virtual-lts-utopic, linux-image-virtual-lts-xenial, linux-image-virtual-lts-vivid, linux-image-powerpc-smp, linux-image-powerpc64-emb-lts-vivid, linux-image-lowlatency-lts-wily, linux-image-generic-lts-vivid, linux-image-powerpc-smp-lts-wily, linux-image-powerpc-smp-lts-xenial, linux-image-generic-lts-wily, linux-image-powerpc-e500mc-lts-utopic, linux-image-generic-lpae, linux-image-lowlatency-lts-utopic, linux-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-generic-lts-xenial, linux-image-generic-lpae-lts-wily, linux-aws, linux-image-generic-lts-utopic, linux-image-powerpc-e500mc-lts-wily, linux-image-powerpc64-emb-lts-utopic, linux, linux-image-4.4.0-198-lowlatency, linux-image-4.4.0-1119-aws, linux-image-powerpc64-emb-lts-xenial, linux-snapdragon, linux-image-virtual, linux-image-kvm
• USN-4680-1: linux-image-4.15.0-1082-kvm, linux-image-snapdragon, linux-kvm, linux-image-raspi2, linux-image-lowlatency-hwe-16.04, linux-image-generic-lpae-hwe-16.04, linux-aws-hwe, linux-gcp-4.15, linux-image-lowlatency-hwe-16.04-edge, linux-image-4.15.0-129-generic-lpae, linux-image-oem, linux-image-4.15.0-129-generic, linux-image-4.15.0-1094-snapdragon, linux-oracle, linux-raspi2, linux-image-generic, linux-image-virtual-hwe-16.04-edge, linux-image-4.15.0-1103-azure, linux-image-4.15.0-1077-gke, linux-image-azure-lts-18.04, linux-image-4.15.0-1077-raspi2, linux-image-gcp-lts-18.04, linux-image-lowlatency, linux-image-aws-lts-18.04, linux-image-gcp, linux-image-gke-4.15, linux-hwe, linux-image-generic-hwe-16.04, linux-image-generic-hwe-16.04-edge, linux-image-azure-edge, linux-image-generic-lpae-hwe-16.04-edge, linux-image-aws-hwe, linux-image-oracle-lts-18.04, linux-image-gke, linux-azure-4.15, linux-image-4.15.0-129-lowlatency, linux-image-4.15.0-1062-oracle, linux-image-generic-lpae, linux-gcp, linux-image-4.15.0-1091-aws, linux-image-azure, linux-aws, linux-image-oracle, linux-image-4.15.0-1091-gcp, linux, linux-azure, linux-image-virtual-hwe-16.04, linux-snapdragon, linux-image-virtual, linux-image-kvm, linux-gke-4.15
• USN-4912-1: linux-oem-5.6, linux-image-5.6.0-1053-oem, linux-image-oem-20.04