USN-4578-1: 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-oem - Linux kernel for OEM systems
• 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

Hadar Manor discovered that the DCCP protocol implementation in the Linux
kernel improperly handled socket reuse, 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-2020-16119)

Wen Xu discovered that the XFS file system in the Linux kernel did not
properly validate inode metadata in some situations. An attacker could use
this to construct a malicious XFS image that, when mounted, could cause a
denial of service (system crash). (CVE-2018-10322)

It was discovered that the btrfs file system in the Linux kernel contained
a use-after-free vulnerability when merging free space. An attacker could
use this to construct a malicious btrfs image that, when mounted and
operated on, could cause a denial of service (system crash).
(CVE-2019-19448)

Jay Shin discovered that the ext4 file system implementation in the Linux
kernel did not properly handle directory access with broken indexing,
leading to an out-of-bounds read vulnerability. A local attacker could use
this to cause a denial of service (system crash). (CVE-2020-14314)

Giuseppe Scrivano discovered that the overlay file system in the Linux
kernel did not properly perform permission checks in some situations. A
local attacker could possibly use this to bypass intended restrictions and
gain read access to restricted files. (CVE-2020-16120)

It was discovered that the NFS client implementation in the Linux kernel
did not properly perform bounds checking before copying security labels in
some situations. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2020-25212)

It was discovered that the NFC implementation in the Linux kernel did not
properly perform permissions checks when opening raw sockets. A local
attacker could use this to create or listen to NFC traffic.
(CVE-2020-26088)

Update instructions

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

Ubuntu 18.04

• linux-image-4.15.0-1057-oracle - 4.15.0-1057.62
• linux-image-4.15.0-1072-gke - 4.15.0-1072.76
• linux-image-4.15.0-1073-raspi2 - 4.15.0-1073.78
• linux-image-4.15.0-1077-kvm - 4.15.0-1077.79
• linux-image-4.15.0-1086-aws - 4.15.0-1086.91
• linux-image-4.15.0-1086-gcp - 4.15.0-1086.98
• linux-image-4.15.0-1089-snapdragon - 4.15.0-1089.98
• linux-image-4.15.0-1099-azure - 4.15.0-1099.110
• linux-image-4.15.0-1099-oem - 4.15.0-1099.109
• linux-image-4.15.0-121-generic - 4.15.0-121.123
• linux-image-4.15.0-121-generic-lpae - 4.15.0-121.123
• linux-image-4.15.0-121-lowlatency - 4.15.0-121.123
• linux-image-aws-lts-18.04 - 4.15.0.1086.88
• linux-image-azure-lts-18.04 - 4.15.0.1099.72
• linux-image-gcp-lts-18.04 - 4.15.0.1086.104
• linux-image-generic - 4.15.0.121.108
• linux-image-generic-lpae - 4.15.0.121.108
• linux-image-gke - 4.15.0.1072.76
• linux-image-gke-4.15 - 4.15.0.1072.76
• linux-image-kvm - 4.15.0.1077.73
• linux-image-lowlatency - 4.15.0.121.108
• linux-image-oem - 4.15.0.1099.103
• linux-image-oracle-lts-18.04 - 4.15.0.1057.67
• linux-image-raspi2 - 4.15.0.1073.70
• linux-image-snapdragon - 4.15.0.1089.92
• linux-image-virtual - 4.15.0.121.108

Ubuntu 16.04

• linux-image-4.15.0-1056-oracle - 4.15.0-1056.61~16.04.1
• linux-image-4.15.0-1085-aws - 4.15.0-1085.90~16.04.1
• linux-image-4.15.0-1086-gcp - 4.15.0-1086.98~16.04.1
• linux-image-4.15.0-1098-azure - 4.15.0-1098.109~16.04.1
• linux-image-4.15.0-120-generic - 4.15.0-120.122~16.04.1
• linux-image-4.15.0-120-generic-lpae - 4.15.0-120.122~16.04.1
• linux-image-4.15.0-120-lowlatency - 4.15.0-120.122~16.04.1
• linux-image-aws-hwe - 4.15.0.1085.81
• linux-image-azure - 4.15.0.1098.92
• linux-image-gcp - 4.15.0.1086.87
• linux-image-generic-hwe-16.04 - 4.15.0.120.121
• linux-image-generic-lpae-hwe-16.04 - 4.15.0.120.121
• linux-image-gke - 4.15.0.1086.87
• linux-image-lowlatency-hwe-16.04 - 4.15.0.120.121
• linux-image-oem - 4.15.0.120.121
• linux-image-oracle - 4.15.0.1056.46
• linux-image-virtual-hwe-16.04 - 4.15.0.120.121

Ubuntu 14.04

• linux-image-4.15.0-1098-azure - 4.15.0-1098.109~14.04.1
• linux-image-azure - 4.15.0.1098.74

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-2020-26088
• CVE-2018-10322
• CVE-2020-25212
• CVE-2020-14314
• CVE-2020-16119
• CVE-2019-19448
• CVE-2020-16120

Related notices

• USN-4579-1: linux-image-4.4.0-193-lowlatency, linux-image-powerpc-smp, linux-image-4.4.0-1145-snapdragon, linux-image-lowlatency-lts-utopic, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-generic-lpae-lts-vivid, linux-image-powerpc64-smp-lts-wily, linux-image-snapdragon, linux-image-generic-lpae-lts-wily, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc-e500mc, linux-image-generic-lpae-lts-xenial, linux-raspi2, linux-image-4.4.0-193-generic-lpae, linux-image-4.4.0-193-powerpc64-emb, linux-image-powerpc-smp-lts-utopic, linux-image-raspi2, linux-image-4.4.0-1117-aws, linux-image-powerpc-smp-lts-xenial, linux-image-virtual, linux-lts-xenial, linux-image-powerpc64-emb-lts-utopic, linux-snapdragon, linux-image-powerpc64-smp-lts-vivid, linux-image-virtual-lts-wily, linux-image-generic-lpae, linux-image-lowlatency-lts-wily, linux-aws, linux, linux-image-4.4.0-193-powerpc64-smp, linux-image-powerpc-e500mc-lts-wily, linux-image-4.4.0-193-powerpc-smp, linux-image-generic-lts-wily, linux-image-generic, linux-image-generic-lts-xenial, linux-image-powerpc64-smp, linux-image-4.4.0-193-generic, linux-image-generic-lts-utopic, linux-image-powerpc64-smp-lts-xenial, linux-kvm, linux-image-generic-lpae-lts-utopic, linux-image-4.4.0-1082-kvm, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc64-smp-lts-utopic, linux-image-4.4.0-193-powerpc-e500mc, linux-image-lowlatency-lts-vivid, linux-image-generic-lts-vivid, linux-image-lowlatency-lts-xenial, linux-image-powerpc64-emb-lts-wily, linux-image-powerpc64-emb, linux-image-virtual-lts-xenial, linux-image-4.4.0-1081-aws, linux-image-powerpc-smp-lts-vivid, linux-image-powerpc64-emb-lts-vivid, linux-image-virtual-lts-utopic, linux-image-4.4.0-1141-raspi2, linux-image-aws, linux-image-lowlatency, linux-image-kvm, linux-image-powerpc-smp-lts-wily, linux-image-virtual-lts-vivid
• USN-4525-1: linux-image-raspi-hwe-18.04-edge, linux-gcp-5.4, linux-image-aws-edge, linux-image-generic-lpae-hwe-18.04-edge, linux-image-virtual-hwe-18.04-edge, linux-image-oem, linux-image-5.4.0-1024-kvm, linux-oracle, linux-oracle-5.4, linux-image-5.4.0-1026-azure, linux-image-5.4.0-1025-gcp, linux-image-gcp-edge, linux-raspi, linux-image-raspi2, linux-image-generic-hwe-18.04-edge, linux-azure-5.4, linux-image-azure, linux-image-generic-lpae-hwe-20.04, linux-image-virtual, linux-image-lowlatency-hwe-18.04-edge, linux-image-gcp, linux-image-azure-edge, linux-image-generic-lpae, linux-image-snapdragon-hwe-18.04-edge, linux-aws, linux-image-5.4.0-1025-oracle, linux-image-lowlatency-hwe-20.04, linux-image-virtual-hwe-18.04, linux, linux-image-5.4.0-48-generic, linux-image-generic, linux-image-oracle-edge, linux-image-5.4.0-1025-aws, linux-image-oracle, linux-image-oem-osp1, linux-hwe-5.4, linux-image-raspi-hwe-18.04, linux-kvm, linux-image-lowlatency-hwe-18.04, linux-image-gke, linux-image-virtual-hwe-20.04, linux-azure, linux-image-generic-hwe-20.04, linux-aws-5.4, linux-image-raspi, linux-image-generic-hwe-18.04, linux-raspi-5.4, linux-image-snapdragon-hwe-18.04, linux-image-raspi2-hwe-18.04-edge, linux-image-aws, linux-image-5.4.0-1019-raspi, linux-image-lowlatency, linux-image-generic-lpae-hwe-18.04, linux-gcp, linux-image-kvm, linux-image-raspi2-hwe-18.04, linux-image-5.4.0-48-lowlatency, linux-image-5.4.0-48-generic-lpae
• USN-4527-1: linux-image-4.4.0-1078-aws, linux-image-powerpc-smp, linux-image-virtual-lts-vivid, linux-image-4.4.0-1114-aws, linux-image-4.4.0-190-powerpc-smp, linux-image-lowlatency-lts-utopic, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-generic-lpae-lts-vivid, linux-image-powerpc64-smp-lts-wily, linux-image-4.4.0-190-lowlatency, linux-snapdragon, linux-image-snapdragon, linux-image-generic-lpae-lts-wily, linux-image-powerpc-e500mc-lts-vivid, linux-image-4.4.0-1139-raspi2, linux-image-powerpc-e500mc, linux-image-generic-lpae-lts-xenial, linux-raspi2, linux-image-powerpc-smp-lts-utopic, linux-image-raspi2, linux-image-4.4.0-190-powerpc64-emb, linux-image-4.4.0-190-generic-lpae, linux-image-powerpc-smp-lts-xenial, linux-image-virtual, linux-image-powerpc64-emb-lts-utopic, linux-lts-xenial, linux-image-powerpc64-smp-lts-vivid, linux-image-virtual-lts-wily, linux-image-generic-lpae, linux-image-lowlatency-lts-wily, linux-aws, linux, linux-image-powerpc-e500mc-lts-wily, linux-image-generic-lts-wily, linux-image-powerpc64-smp, linux-image-generic, linux-image-4.4.0-190-powerpc-e500mc, linux-image-generic-lts-xenial, linux-image-generic-lts-utopic, linux-image-powerpc64-smp-lts-xenial, linux-kvm, linux-image-generic-lpae-lts-utopic, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc64-smp-lts-utopic, linux-image-lowlatency-lts-vivid, linux-image-generic-lts-vivid, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-1143-snapdragon, linux-image-powerpc64-emb, linux-image-powerpc64-emb-lts-wily, linux-image-powerpc-smp-lts-vivid, linux-image-powerpc64-emb-lts-vivid, linux-image-virtual-lts-utopic, linux-image-virtual-lts-xenial, linux-image-4.4.0-1080-kvm, linux-image-4.4.0-190-powerpc64-smp, linux-image-aws, linux-image-lowlatency, linux-image-kvm, linux-image-powerpc-smp-lts-wily, linux-image-4.4.0-190-generic
• USN-4752-1: linux-image-5.6.0-1048-oem, linux-oem-5.6, linux-image-oem-20.04
• USN-4576-1: linux-image-raspi-hwe-18.04-edge, linux-gcp-5.4, linux-image-5.4.0-1028-oracle, linux-image-aws-edge, linux-image-generic-lpae-hwe-18.04-edge, linux-image-virtual-hwe-18.04-edge, linux-image-5.4.0-51-generic, linux-image-5.4.0-1026-kvm, linux-image-oem, linux-oracle, linux-oracle-5.4, linux-raspi, linux-image-5.4.0-51-lowlatency, linux-image-5.4.0-1028-gcp, linux-image-raspi2, linux-image-generic-hwe-18.04-edge, linux-azure-5.4, linux-image-azure, linux-image-generic-lpae-hwe-20.04, linux-image-virtual, linux-image-5.4.0-1031-azure, linux-image-lowlatency-hwe-18.04-edge, linux-image-gcp, linux-image-azure-edge, linux-image-generic-lpae, linux-image-snapdragon-hwe-18.04-edge, linux-aws, linux-image-lowlatency-hwe-20.04, linux-image-virtual-hwe-18.04, linux, linux-image-generic, linux-image-oracle-edge, linux-image-raspi2-hwe-18.04, linux-image-oracle, linux-image-5.4.0-51-generic-lpae, linux-image-oem-osp1, linux-hwe-5.4, linux-image-raspi-hwe-18.04, linux-kvm, linux-image-lowlatency-hwe-18.04, linux-image-gke, linux-image-virtual-hwe-20.04, linux-azure, linux-image-generic-hwe-20.04, linux-aws-5.4, linux-image-raspi, linux-image-generic-hwe-18.04, linux-image-5.4.0-1028-aws, linux-raspi-5.4, linux-image-snapdragon-hwe-18.04, linux-image-raspi2-hwe-18.04-edge, linux-image-aws, linux-image-lowlatency, linux-image-generic-lpae-hwe-18.04, linux-gcp, linux-image-kvm, linux-image-5.4.0-1021-raspi, linux-image-gcp-edge
• USN-4577-1: linux-image-gke-5.0, linux-image-5.0.0-1049-gke, linux-hwe, linux-image-5.3.0-1035-raspi2, linux-gke-5.3, linux-image-oem-osp1, linux-image-5.3.0-1038-gke, linux-image-5.0.0-1069-oem-osp1, linux-gke-5.0, linux-image-5.3.0-68-generic, linux-raspi2-5.3, linux-image-raspi2-hwe-18.04, linux-oem-osp1, linux-image-gke-5.3, linux-image-gkeop-5.3, linux-image-5.3.0-68-lowlatency
• USN-4580-1: linux-image-3.2.0-149-generic, linux-image-3.13.0-182-powerpc-smp, linux-image-powerpc-smp, linux-image-3.13.0-182-powerpc-e500mc, linux-image-generic-lpae-lts-saucy, linux-image-3.2.0-149-generic-pae, linux-image-powerpc-e500mc, linux-image-virtual, linux-image-powerpc, linux-image-generic-lpae, linux-image-3.13.0-182-generic, linux-image-3.2.0-149-powerpc64-smp, linux, linux-image-generic-lpae-lts-trusty, linux-image-generic-pae, linux-image-powerpc64-smp, linux-image-generic, linux-image-generic-lts-trusty, linux-image-powerpc-e500, linux-image-3.13.0-182-powerpc-e500, linux-image-omap, linux-image-3.13.0-182-powerpc64-emb, linux-image-3.13.0-182-powerpc64-smp, linux-lts-trusty, linux-image-3.2.0-149-omap, linux-image-3.2.0-149-virtual, linux-image-powerpc64-emb, linux-image-generic-lts-quantal, linux-image-3.13.0-182-lowlatency, linux-image-3.13.0-182-generic-lpae, linux-image-3.2.0-149-highbank, linux-image-generic-lts-raring, linux-image-lowlatency-pae, linux-image-highbank, linux-image-3.2.0-149-powerpc-smp, linux-image-lowlatency, linux-image-server, linux-image-generic-lts-saucy
• LSN-0072-1: lowlatency-5.4, gcp, generic-4.15, lowlatency-4.4, oem, generic-5.4, azure, lowlatency-4.15, generic-4.4, aws