USN-4680-1: Linux kernel vulnerabilities

Releases

• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• linux - Linux kernel
• linux-aws - Linux kernel for Amazon Web Services (AWS) systems
• linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
• linux-azure - Linux kernel for Microsoft Azure Cloud systems
• linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems
• linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
• linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
• linux-gke-4.15 - Linux kernel for Google Container Engine (GKE) systems
• linux-hwe - Linux hardware enablement (HWE) kernel
• linux-kvm - Linux kernel for cloud environments
• linux-oracle - Linux kernel for Oracle Cloud systems
• linux-raspi2 - Linux kernel for Raspberry Pi (V8) systems
• linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors

Details

It was discovered that debugfs in the Linux kernel as used by blktrace
contained a use-after-free in some situations. A privileged local attacker
could possibly use this to cause a denial of service (system crash).
(CVE-2019-19770)

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 the console keyboard driver in the Linux kernel
contained a race condition. A local attacker could use this to expose
sensitive information (kernel memory). (CVE-2020-25656)

Minh Yuan discovered that the tty driver in the Linux kernel contained race
conditions when handling fonts. A local attacker could possibly use this to
expose sensitive information (kernel memory). (CVE-2020-25668)

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)

Jinoh Kang discovered that the Xen event channel infrastructure in the
Linux kernel contained a race condition. An attacker in guest could
possibly use this to cause a denial of service (dom0 crash).
(CVE-2020-27675)

Daniel Axtens discovered that PowerPC RTAS implementation in the Linux
kernel did not properly restrict memory accesses in some situations. A
privileged local attacker could use this to arbitrarily modify kernel
memory, potentially bypassing kernel lockdown restrictions.
(CVE-2020-27777)

Minh Yuan discovered that the framebuffer console driver in the Linux
kernel did not properly handle fonts in some conditions. A local attacker
could use this to cause a denial of service (system crash) or possibly
expose sensitive information (kernel memory). (CVE-2020-28974)

Update instructions

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

Ubuntu 18.04

• linux-image-4.15.0-1062-oracle - 4.15.0-1062.68
• linux-image-4.15.0-1077-gke - 4.15.0-1077.82
• linux-image-4.15.0-1077-raspi2 - 4.15.0-1077.82
• linux-image-4.15.0-1082-kvm - 4.15.0-1082.84
• linux-image-4.15.0-1091-aws - 4.15.0-1091.96
• linux-image-4.15.0-1091-gcp - 4.15.0-1091.104
• linux-image-4.15.0-1094-snapdragon - 4.15.0-1094.103
• linux-image-4.15.0-1103-azure - 4.15.0-1103.114
• linux-image-4.15.0-129-generic - 4.15.0-129.132
• linux-image-4.15.0-129-generic-lpae - 4.15.0-129.132
• linux-image-4.15.0-129-lowlatency - 4.15.0-129.132
• linux-image-aws-lts-18.04 - 4.15.0.1091.93
• linux-image-azure-lts-18.04 - 4.15.0.1103.76
• linux-image-gcp-lts-18.04 - 4.15.0.1091.109
• linux-image-generic - 4.15.0.129.116
• linux-image-generic-lpae - 4.15.0.129.116
• linux-image-gke - 4.15.0.1077.81
• linux-image-gke-4.15 - 4.15.0.1077.81
• linux-image-kvm - 4.15.0.1082.78
• linux-image-lowlatency - 4.15.0.129.116
• linux-image-oracle-lts-18.04 - 4.15.0.1062.72
• linux-image-raspi2 - 4.15.0.1077.74
• linux-image-snapdragon - 4.15.0.1094.97
• linux-image-virtual - 4.15.0.129.116

Ubuntu 16.04

• linux-image-4.15.0-1062-oracle - 4.15.0-1062.68~16.04.1
• linux-image-4.15.0-1091-aws - 4.15.0-1091.96~16.04.1
• linux-image-4.15.0-1091-gcp - 4.15.0-1091.104~16.04.1
• linux-image-4.15.0-1103-azure - 4.15.0-1103.114~16.04.1
• linux-image-4.15.0-129-generic - 4.15.0-129.132~16.04.1
• linux-image-4.15.0-129-generic-lpae - 4.15.0-129.132~16.04.1
• linux-image-4.15.0-129-lowlatency - 4.15.0-129.132~16.04.1
• linux-image-aws-hwe - 4.15.0.1091.85
• linux-image-azure - 4.15.0.1103.96
• linux-image-gcp - 4.15.0.1091.92
• linux-image-generic-hwe-16.04 - 4.15.0.129.128
• linux-image-generic-lpae-hwe-16.04 - 4.15.0.129.128
• linux-image-gke - 4.15.0.1091.92
• linux-image-lowlatency-hwe-16.04 - 4.15.0.129.128
• linux-image-oem - 4.15.0.129.128
• linux-image-oracle - 4.15.0.1062.51
• linux-image-virtual-hwe-16.04 - 4.15.0.129.128

Ubuntu 14.04

• linux-image-4.15.0-1103-azure - 4.15.0-1103.114~14.04.1
• linux-image-azure - 4.15.0.1103.78

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-2020-0423
• CVE-2020-28974
• CVE-2020-25656
• CVE-2020-10135
• CVE-2020-27675
• CVE-2020-27777
• CVE-2020-25705
• CVE-2019-19770
• CVE-2020-25668

Related notices

• USN-4658-1: linux-image-azure-edge, linux-image-generic-lpae-hwe-18.04, linux-image-5.4.0-1030-oracle, linux-image-kvm, linux-image-snapdragon-hwe-18.04-edge, linux-image-oracle-edge, linux-aws, linux-oracle-5.4, linux-image-5.4.0-1030-aws, linux-image-aws, linux-image-5.4.0-56-generic-lpae, linux-image-azure, linux-image-gcp, linux-image-generic-lpae-hwe-18.04-edge, linux-image-virtual, linux-oracle, linux-image-raspi2-hwe-18.04, linux-image-raspi-hwe-18.04, linux-image-lowlatency-hwe-18.04-edge, linux-image-gcp-edge, linux-image-5.4.0-56-generic, linux-hwe-5.4, linux-image-5.4.0-1028-kvm, linux-azure-5.4, linux-image-5.4.0-1030-gcp, linux-image-gke, linux-image-oem, linux-image-5.4.0-1032-azure, linux-image-lowlatency, linux-image-virtual-hwe-20.04, linux-kvm, linux-image-5.4.0-1023-raspi, linux-raspi, linux-image-raspi2-hwe-18.04-edge, linux, linux-image-raspi2, linux-gcp, linux-image-oem-osp1, linux-image-generic-hwe-18.04, linux-image-raspi, linux-image-generic-lpae, linux-image-5.4.0-56-lowlatency, linux-gcp-5.4, linux-image-generic-hwe-18.04-edge, linux-image-generic-hwe-20.04, linux-image-lowlatency-hwe-18.04, linux-image-lowlatency-hwe-20.04, linux-image-generic, linux-image-aws-edge, linux-image-snapdragon-hwe-18.04, linux-image-oracle, linux-image-generic-lpae-hwe-20.04, linux-image-virtual-hwe-18.04, linux-image-raspi-hwe-18.04-edge, linux-azure, linux-raspi-5.4, linux-aws-5.4, linux-image-virtual-hwe-18.04-edge
• USN-4659-1: linux-image-kvm, linux-aws, linux-image-aws, linux-image-oem-20.04, linux-image-azure, linux-image-gcp, linux-image-virtual, linux-image-generic-64k, linux-image-raspi-nolpae, linux-image-lowlatency-hwe-20.04-edge, linux-oracle, linux-image-virtual-hwe-20.04-edge, linux-image-generic-64k-hwe-20.04, linux-image-generic-64k-hwe-20.04-edge, linux-image-5.8.0-31-generic-64k, linux-image-virtual-hwe-20.04, linux-image-gke, linux-kvm, linux-raspi, linux-image-lowlatency, linux-image-5.8.0-31-generic-lpae, linux-image-5.8.0-1014-aws, linux, linux-gcp, linux-image-5.8.0-31-lowlatency, linux-image-generic-lpae-hwe-20.04-edge, linux-image-5.8.0-1012-gcp, linux-image-raspi, linux-image-generic-hwe-20.04-edge, linux-image-5.8.0-1008-raspi-nolpae, linux-image-5.8.0-1011-oracle, linux-image-5.8.0-1008-raspi, linux-image-generic-lpae, linux-image-5.8.0-31-generic, linux-image-generic-hwe-20.04, linux-image-lowlatency-hwe-20.04, linux-image-5.8.0-1013-azure, linux-image-generic, linux-image-5.8.0-1011-kvm, linux-image-oracle, linux-image-generic-lpae-hwe-20.04, linux-azure
• USN-4912-1: linux-image-oem-20.04, linux-image-5.6.0-1053-oem, linux-oem-5.6
• USN-4679-1: linux-image-5.4.0-1034-oracle, linux-image-azure-edge, linux-image-generic-lpae-hwe-18.04, linux-image-kvm, linux-image-snapdragon-hwe-18.04-edge, linux-image-oracle-edge, linux-aws, linux-image-5.4.0-1034-aws, linux-image-5.4.0-59-lowlatency, linux-oracle-5.4, linux-image-aws, linux-image-virtual, linux-image-azure, linux-image-gcp, linux-image-generic-lpae-hwe-18.04-edge, linux-image-5.4.0-1035-azure, linux-oracle, linux-image-raspi2-hwe-18.04, linux-image-raspi-hwe-18.04, linux-image-lowlatency-hwe-18.04-edge, linux-image-gcp-edge, linux-hwe-5.4, linux-azure-5.4, linux-image-oem, linux-image-virtual-hwe-20.04, linux-kvm, linux-raspi, linux-image-lowlatency, linux-gke-5.4, linux-image-5.4.0-1033-gcp, linux-image-raspi2-hwe-18.04-edge, linux, linux-image-5.4.0-1031-kvm, linux-image-raspi2, linux-gcp, linux-image-5.4.0-59-generic-lpae, linux-image-oem-osp1, linux-image-generic-hwe-18.04, linux-image-raspi, linux-image-5.4.0-1026-raspi, linux-image-5.4.0-59-generic, linux-image-generic-lpae, linux-gcp-5.4, linux-image-generic-hwe-18.04-edge, linux-image-generic-hwe-20.04, linux-image-lowlatency-hwe-18.04, linux-image-lowlatency-hwe-20.04, linux-image-5.4.0-1033-gke, linux-image-generic, linux-image-aws-edge, linux-image-snapdragon-hwe-18.04, linux-image-oracle, linux-image-generic-lpae-hwe-20.04, linux-image-virtual-hwe-18.04, linux-image-gke-5.4, linux-image-raspi-hwe-18.04-edge, linux-azure, linux-raspi-5.4, linux-aws-5.4, linux-image-virtual-hwe-18.04-edge
• USN-4681-1: linux-image-kvm, linux-image-lowlatency-lts-vivid, linux-aws, linux-image-aws, linux-image-generic-lts-vivid, linux-image-powerpc-smp, linux-image-virtual, linux-image-powerpc64-emb-lts-wily, linux-image-virtual-lts-utopic, linux-image-4.4.0-198-powerpc64-emb, linux-image-powerpc-e500mc-lts-xenial, linux-image-powerpc64-emb-lts-utopic, linux-image-powerpc-smp-lts-wily, linux-image-4.4.0-1147-snapdragon, linux-image-generic-lpae-lts-wily, linux-image-4.4.0-198-powerpc64-smp, linux-image-4.4.0-1143-raspi2, linux-image-lowlatency-lts-wily, linux-image-generic-lpae-lts-utopic, linux-image-powerpc64-smp-lts-wily, linux-image-4.4.0-198-powerpc-e500mc, linux-image-powerpc64-emb-lts-vivid, linux-kvm, linux-image-powerpc64-smp-lts-vivid, linux-image-lowlatency, linux-image-lowlatency-lts-utopic, linux-image-powerpc-smp-lts-xenial, linux-image-generic-lts-xenial, linux-raspi2, linux, linux-image-generic-lpae-lts-vivid, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc-smp-lts-vivid, linux-image-raspi2, linux-image-powerpc-e500mc-lts-wily, linux-image-snapdragon, linux-image-4.4.0-1085-kvm, linux-lts-xenial, linux-image-4.4.0-198-powerpc-smp, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc-smp-lts-utopic, linux-image-generic-lpae, linux-image-4.4.0-198-generic-lpae, linux-image-generic-lts-utopic, linux-image-4.4.0-1083-aws, linux-image-4.4.0-198-lowlatency, linux-image-generic, linux-image-4.4.0-1119-aws, linux-image-powerpc64-emb, linux-image-virtual-lts-wily, linux-image-virtual-lts-xenial, linux-snapdragon, linux-image-powerpc64-smp-lts-utopic, linux-image-virtual-lts-vivid, linux-image-lowlatency-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc-e500mc, linux-image-powerpc64-smp, linux-image-powerpc64-emb-lts-xenial, linux-image-generic-lts-wily, linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-198-generic
• USN-4683-1: linux-image-oem-20.04, linux-image-5.6.0-1039-oem, linux-oem-5.6
• USN-4751-1: linux-image-kvm, linux-image-5.8.0-1016-raspi, linux-aws, linux-image-5.8.0-1016-raspi-nolpae, linux-image-aws, linux-image-oem-20.04, linux-image-azure, linux-image-gcp, linux-image-virtual, linux-image-5.8.0-1023-gcp, linux-image-generic-64k, linux-image-raspi-nolpae, linux-image-lowlatency-hwe-20.04-edge, linux-oracle, linux-image-5.8.0-44-generic-64k, linux-image-virtual-hwe-20.04-edge, linux-image-generic-64k-hwe-20.04, linux-image-5.8.0-44-lowlatency, linux-image-generic-64k-hwe-20.04-edge, linux-image-5.8.0-1023-azure, linux-image-virtual-hwe-20.04, linux-image-gke, linux-kvm, linux-raspi, linux-image-lowlatency, linux, linux-gcp, linux-image-generic-lpae-hwe-20.04-edge, linux-image-5.8.0-44-generic-lpae, linux-image-raspi, linux-image-generic-hwe-20.04-edge, linux-image-generic-lpae, linux-image-5.8.0-1021-oracle, linux-image-generic-hwe-20.04, linux-image-5.8.0-44-generic, linux-image-lowlatency-hwe-20.04, linux-image-generic, linux-image-5.8.0-1024-aws, linux-image-oracle, linux-image-generic-lpae-hwe-20.04, linux-hwe-5.8, linux-image-5.8.0-1019-kvm, linux-azure
• USN-4657-1: linux-image-kvm, linux-image-lowlatency-lts-vivid, linux-aws, linux-image-aws, linux-image-generic-lts-vivid, linux-image-powerpc-smp, linux-image-virtual, linux-image-powerpc64-emb-lts-wily, linux-image-virtual-lts-utopic, linux-image-powerpc-e500mc-lts-xenial, linux-image-powerpc64-emb-lts-utopic, linux-image-powerpc-smp-lts-wily, linux-image-generic-lpae-lts-wily, linux-image-lowlatency-lts-wily, linux-image-generic-lpae-lts-utopic, linux-image-powerpc64-smp-lts-wily, linux-image-powerpc64-emb-lts-vivid, linux-kvm, linux-image-4.4.0-1118-aws, linux-image-4.4.0-197-lowlatency, linux-image-4.4.0-1082-aws, linux-image-lowlatency, linux-image-lowlatency-lts-utopic, linux-image-powerpc64-smp-lts-vivid, linux-image-powerpc-smp-lts-xenial, linux-image-generic-lts-xenial, linux-raspi2, linux, linux-image-4.4.0-1146-snapdragon, linux-image-generic-lpae-lts-vivid, linux-image-powerpc-e500mc-lts-utopic, linux-image-4.4.0-1142-raspi2, linux-image-powerpc-smp-lts-vivid, linux-image-raspi2, linux-image-powerpc-e500mc-lts-wily, linux-image-4.4.0-197-generic-lpae, linux-image-snapdragon, linux-lts-xenial, linux-image-powerpc-e500mc-lts-vivid, linux-image-4.4.0-197-powerpc-smp, linux-image-powerpc-smp-lts-utopic, linux-image-generic-lpae, linux-image-4.4.0-1084-kvm, linux-image-4.4.0-197-powerpc64-smp, linux-image-generic-lts-utopic, linux-image-generic, linux-image-virtual-lts-wily, linux-image-virtual-lts-xenial, linux-image-powerpc64-emb, linux-snapdragon, linux-image-powerpc64-smp-lts-utopic, linux-image-virtual-lts-vivid, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-197-generic, linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-197-powerpc-e500mc, linux-image-powerpc-e500mc, linux-image-powerpc64-smp, linux-image-powerpc64-emb-lts-xenial, linux-image-generic-lts-wily, linux-image-4.4.0-197-powerpc64-emb, linux-image-generic-lpae-lts-xenial
• USN-4752-1: linux-image-5.6.0-1048-oem, linux-image-oem-20.04, linux-oem-5.6
• USN-4708-1: linux-image-4.4.0-201-powerpc-e500mc, linux-image-lowlatency-lts-vivid, linux-image-generic-lts-vivid, linux-image-virtual, linux-image-powerpc-smp, linux-image-powerpc64-emb-lts-wily, linux-image-virtual-lts-utopic, linux-image-4.4.0-201-powerpc-smp, linux-image-powerpc-e500mc-lts-xenial, linux-image-powerpc64-emb-lts-utopic, linux-image-powerpc-smp-lts-wily, linux-image-generic-lpae-lts-wily, linux-image-4.4.0-201-generic-lpae, linux-image-lowlatency-lts-wily, linux-image-generic-lpae-lts-utopic, linux-image-4.4.0-201-lowlatency, linux-image-powerpc64-emb-lts-vivid, linux-image-powerpc64-smp-lts-wily, linux-image-powerpc64-smp-lts-vivid, linux-image-lowlatency, linux-image-lowlatency-lts-utopic, linux-image-powerpc-smp-lts-xenial, linux-image-generic-lts-xenial, linux, linux-image-generic-lpae-lts-vivid, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc-smp-lts-vivid, linux-image-powerpc-e500mc-lts-wily, linux-lts-xenial, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc-smp-lts-utopic, linux-image-4.4.0-201-powerpc64-emb, linux-image-generic-lpae, linux-image-generic-lts-utopic, linux-image-4.4.0-201-generic, linux-image-generic, linux-image-virtual-lts-wily, linux-image-virtual-lts-xenial, linux-image-powerpc64-emb, linux-image-powerpc64-smp-lts-utopic, linux-image-virtual-lts-vivid, linux-image-lowlatency-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc-e500mc, linux-image-powerpc64-smp, linux-image-powerpc64-emb-lts-xenial, linux-image-4.4.0-201-powerpc64-smp, linux-image-generic-lts-wily, linux-image-generic-lpae-lts-xenial