1. Ubuntu Security Notices
  2. USN-4979-1

USN-4979-1: Linux kernel vulnerabilities

Publication date

4 June 2021

Overview

Several security issues were fixed in the Linux kernel.

Releases

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-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

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...

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

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-4.15.0-1072-oracle –  4.15.0-1072.80
linux-image-4.15.0-1086-raspi2 –  4.15.0-1086.91
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-raspi2 –  4.15.0.1086.83
linux-image-snapdragon –  4.15.0.1103.106
linux-image-virtual –  4.15.0.144.131
16.04 xenial 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  
14.04 trusty linux-image-4.15.0-1115-azure –  4.15.0-1115.128~14.04.1  
linux-image-azure –  4.15.0.1115.88  

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References

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