==========================================================================
Ubuntu Security Notice USN-4979-1
June 03, 2021

linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp,
linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle, linux-snapdragon
vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure-4.15: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors
- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the
Linux kernel contained a reference counting error. A local attacker could
use this to cause a denial of service (system crash). (CVE-2020-25670)

Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the
Linux kernel did not properly deallocate memory in certain error
situations. A local attacker could use this to cause a denial of service
(memory exhaustion). (CVE-2020-25671, CVE-2020-25672)

Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the
Linux kernel did not properly handle error conditions in some situations,
leading to an infinite loop. A local attacker could use this to cause a
denial of service. (CVE-2020-25673)

It was discovered that the Realtek RTL8188EU Wireless device driver in the
Linux kernel did not properly validate ssid lengths in some situations. An
attacker could use this to cause a denial of service (system crash).
(CVE-2021-28660)

Zygo Blaxell discovered that the btrfs file system implementation in the
Linux kernel contained a race condition during certain cloning operations.
A local attacker could possibly use this to cause a denial of service
(system crash). (CVE-2021-28964)

Vince Weaver discovered that the perf subsystem in the Linux kernel did not
properly handle certain PEBS records properly for some Intel Haswell
processors. A local attacker could use this to cause a denial of service
(system crash). (CVE-2021-28971)

It was discovered that the RPA PCI Hotplug driver implementation in the
Linux kernel did not properly handle device name writes via sysfs, leading
to a buffer overflow. A privileged attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2021-28972)

It was discovered that the Qualcomm IPC router implementation in the Linux
kernel did not properly initialize memory passed to user space. A local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2021-29647)

Dan Carpenter discovered that the block device manager (dm) implementation
in the Linux kernel contained a buffer overflow in the ioctl for listing
devices. A privileged local attacker could use this to cause a denial of
service (system crash). (CVE-2021-31916)

It was discovered that the CIPSO implementation in the Linux kernel did not
properly perform reference counting in some situations, leading to use-
after-free vulnerabilities. An attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2021-33033)

Wolfgang Frisch discovered that the ext4 file system implementation in the
Linux kernel contained an integer overflow when handling metadata inode
extents. An attacker could use this to construct a malicious ext4 file
system image that, when mounted, could cause a denial of service (system
crash). (CVE-2021-3428)

马哲宇 discovered that the IEEE 1394 (Firewire) nosy packet sniffer driver in
the Linux kernel did not properly perform reference counting in some
situations, 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-2021-3483)

Update instructions:

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1072-oracle  4.15.0-1072.80
  linux-image-4.15.0-1092-kvm     4.15.0-1092.94
  linux-image-4.15.0-1100-gcp     4.15.0-1100.113
  linux-image-4.15.0-1103-aws     4.15.0-1103.110
  linux-image-4.15.0-1103-snapdragon  4.15.0-1103.112
  linux-image-4.15.0-1115-azure   4.15.0-1115.128
  linux-image-4.15.0-144-generic  4.15.0-144.148
  linux-image-4.15.0-144-generic-lpae  4.15.0-144.148
  linux-image-4.15.0-144-lowlatency  4.15.0-144.148
  linux-image-aws-lts-18.04       4.15.0.1103.106
  linux-image-azure-lts-18.04     4.15.0.1115.88
  linux-image-gcp-lts-18.04       4.15.0.1100.118
  linux-image-generic             4.15.0.144.131
  linux-image-generic-lpae        4.15.0.144.131
  linux-image-kvm                 4.15.0.1092.88
  linux-image-lowlatency          4.15.0.144.131
  linux-image-oracle-lts-18.04    4.15.0.1072.82
  linux-image-snapdragon          4.15.0.1103.106
  linux-image-virtual             4.15.0.144.131

Ubuntu 16.04 ESM:
  linux-image-4.15.0-1072-oracle  4.15.0-1072.80~16.04.1
  linux-image-4.15.0-1100-gcp     4.15.0-1100.113~16.04.1
  linux-image-4.15.0-1103-aws     4.15.0-1103.110~16.04.1
  linux-image-4.15.0-1115-azure   4.15.0-1115.128~16.04.1
  linux-image-4.15.0-144-generic  4.15.0-144.148~16.04.1
  linux-image-4.15.0-144-lowlatency  4.15.0-144.148~16.04.1
  linux-image-aws-hwe             4.15.0.1103.94
  linux-image-azure               4.15.0.1115.106
  linux-image-gcp                 4.15.0.1100.101
  linux-image-generic-hwe-16.04   4.15.0.144.140
  linux-image-gke                 4.15.0.1100.101
  linux-image-lowlatency-hwe-16.04  4.15.0.144.140
  linux-image-oem                 4.15.0.144.140
  linux-image-oracle              4.15.0.1072.60
  linux-image-virtual-hwe-16.04   4.15.0.144.140

Ubuntu 14.04 ESM:
  linux-image-4.15.0-1115-azure   4.15.0-1115.128~14.04.1
  linux-image-azure               4.15.0.1115.88

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:
  https://ubuntu.com/security/notices/USN-4979-1
  CVE-2020-25670, CVE-2020-25671, CVE-2020-25672, CVE-2020-25673,
  CVE-2021-28660, CVE-2021-28964, CVE-2021-28971, CVE-2021-28972,
  CVE-2021-29647, CVE-2021-31916, CVE-2021-33033, CVE-2021-3428,
  CVE-2021-3483

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-144.148
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1103.110
  https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1115.128
  https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1100.113
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1092.94
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1072.80
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1103.112