1. Ubuntu Security Notices
  2. USN-5136-1

USN-5136-1: Linux kernel vulnerabilities

Publication date

9 November 2021

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

It was discovered that the f2fs file system in the Linux kernel did not
properly validate metadata in some situations. An attacker could use this
to construct a malicious f2fs image that, when mounted and operated on,
could cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2019-19449)

It was discovered that the FUSE user space file system implementation in
the Linux kernel did not properly handle bad inodes in some situations. A
local attacker could possibly use this to cause a denial of service.
(CVE-2020-36322)

It was discovered that the Infiniband RDMA userspace connection manager
implementation in the Linux kernel contained a race condition leading to a
use-after-free vulnerability. A local attacker could use this to cause a
denial of service (system crash) or possible execute arbitrary code.
(

It was discovered that the f2fs file system in the Linux kernel did not
properly validate metadata in some situations. An attacker could use this
to construct a malicious f2fs image that, when mounted and operated on,
could cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2019-19449)

It was discovered that the FUSE user space file system implementation in
the Linux kernel did not properly handle bad inodes in some situations. A
local attacker could possibly use this to cause a denial of service.
(CVE-2020-36322)

It was discovered that the Infiniband RDMA userspace connection manager
implementation in the Linux kernel contained a race condition leading to a
use-after-free vulnerability. A local attacker could use this to cause a
denial of service (system crash) or possible execute arbitrary code.
(CVE-2020-36385)

Ilja Van Sprundel discovered that the SCTP implementation in the Linux
kernel did not properly perform size validations on incoming packets in
some situations. An attacker could possibly use this to expose sensitive
information (kernel memory). (CVE-2021-3655)

It was discovered that the Qualcomm IPC Router protocol implementation in
the Linux kernel did not properly validate metadata in some situations. A
local attacker could use this to cause a denial of service (system crash)
or expose sensitive information. (CVE-2021-3743)

It was discovered that the virtual terminal (vt) device implementation in
the Linux kernel contained a race condition in its ioctl handling that led
to an out-of-bounds read vulnerability. A local attacker could possibly use
this to expose sensitive information. (CVE-2021-3753)

It was discovered that the Linux kernel did not properly account for the
memory usage of certain IPC objects. A local attacker could use this to
cause a denial of service (memory exhaustion). (CVE-2021-3759)

Michael Wakabayashi discovered that the NFSv4 client implementation in the
Linux kernel did not properly order connection setup operations. An
attacker controlling a remote NFS server could use this to cause a denial
of service on the client. (CVE-2021-38199)

It was discovered that the Aspeed Low Pin Count (LPC) Bus Controller
implementation in the Linux kernel did not properly perform boundary checks
in some situations, allowing out-of-bounds write access. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. In Ubuntu, this issue only affected systems running
armhf kernels. (CVE-2021-42252)

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
18.04 bionic linux-image-4.15.0-1030-dell300x –  4.15.0-1030.35
linux-image-4.15.0-1083-oracle –  4.15.0-1083.91
linux-image-4.15.0-1098-raspi2 –  4.15.0-1098.104
linux-image-4.15.0-1102-kvm –  4.15.0-1102.104
linux-image-4.15.0-1111-gcp –  4.15.0-1111.125
linux-image-4.15.0-1115-aws –  4.15.0-1115.122
linux-image-4.15.0-1115-snapdragon –  4.15.0-1115.124
linux-image-4.15.0-1126-azure –  4.15.0-1126.139
linux-image-4.15.0-162-generic –  4.15.0-162.170
linux-image-4.15.0-162-generic-lpae –  4.15.0-162.170
linux-image-4.15.0-162-lowlatency –  4.15.0-162.170
linux-image-aws-lts-18.04 –  4.15.0.1115.118
linux-image-azure-lts-18.04 –  4.15.0.1126.99
linux-image-dell300x –  4.15.0.1030.32
linux-image-gcp-lts-18.04 –  4.15.0.1111.130
linux-image-generic –  4.15.0.162.151
linux-image-generic-lpae –  4.15.0.162.151
linux-image-kvm –  4.15.0.1102.98
linux-image-lowlatency –  4.15.0.162.151
linux-image-oracle-lts-18.04 –  4.15.0.1083.93
linux-image-raspi2 –  4.15.0.1098.96
linux-image-snapdragon –  4.15.0.1115.118
linux-image-virtual –  4.15.0.162.151
16.04 xenial linux-image-4.15.0-1083-oracle –  4.15.0-1083.91~16.04.1  
linux-image-4.15.0-1111-gcp –  4.15.0-1111.125~16.04.1  
linux-image-4.15.0-1115-aws –  4.15.0-1115.122~16.04.1  
linux-image-4.15.0-1126-azure –  4.15.0-1126.139~16.04.1  
linux-image-4.15.0-162-generic –  4.15.0-162.170~16.04.1  
linux-image-4.15.0-162-lowlatency –  4.15.0-162.170~16.04.1  
linux-image-aws-hwe –  4.15.0.1115.105  
linux-image-azure –  4.15.0.1126.117  
linux-image-gcp –  4.15.0.1111.112  
linux-image-generic-hwe-16.04 –  4.15.0.162.155  
linux-image-gke –  4.15.0.1111.112  
linux-image-lowlatency-hwe-16.04 –  4.15.0.162.155  
linux-image-oem –  4.15.0.162.155  
linux-image-oracle –  4.15.0.1083.71  
linux-image-virtual-hwe-16.04 –  4.15.0.162.155  
14.04 trusty linux-image-4.15.0-1126-azure –  4.15.0-1126.139~14.04.1  
linux-image-azure –  4.15.0.1126.99  

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References

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