Advisory Published

USN-5161-1: Linux kernel vulnerabilities

First published: Tue Nov 30 2021(Updated: )

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 AMD Cryptographic Coprocessor (CCP) driver in the Linux kernel did not properly deallocate memory in some error conditions. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2021-3744, CVE-2021-3764) 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)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-5.11.0-41-generic-64k<5.11.0-41.45
5.11.0-41.45
Ubuntu=21.04
All of
ubuntu/linux-image-5.11.0-1022-oracle<5.11.0-1022.23
5.11.0-1022.23
Ubuntu=21.04
All of
ubuntu/linux-image-virtual<5.11.0.41.42
5.11.0.41.42
Ubuntu=21.04
All of
ubuntu/linux-image-generic-64k<5.11.0.41.42
5.11.0.41.42
Ubuntu=21.04
All of
ubuntu/linux-image-generic<5.11.0.41.42
5.11.0.41.42
Ubuntu=21.04
All of
ubuntu/linux-image-aws<5.11.0.1022.23
5.11.0.1022.23
Ubuntu=21.04
All of
ubuntu/linux-image-5.11.0-41-generic-lpae<5.11.0-41.45
5.11.0-41.45
Ubuntu=21.04
All of
ubuntu/linux-image-5.11.0-1022-aws<5.11.0-1022.23
5.11.0-1022.23
Ubuntu=21.04
All of
ubuntu/linux-image-5.11.0-1023-raspi-nolpae<5.11.0-1023.25
5.11.0-1023.25
Ubuntu=21.04
All of
ubuntu/linux-image-5.11.0-41-generic<5.11.0-41.45
5.11.0-41.45
Ubuntu=21.04
All of
ubuntu/linux-image-5.11.0-41-lowlatency<5.11.0-41.45
5.11.0-41.45
Ubuntu=21.04
All of
ubuntu/linux-image-azure<5.11.0.1022.23
5.11.0.1022.23
Ubuntu=21.04
All of
ubuntu/linux-image-5.11.0-1022-azure<5.11.0-1022.23
5.11.0-1022.23
Ubuntu=21.04
All of
ubuntu/linux-image-raspi-nolpae<5.11.0.1023.21
5.11.0.1023.21
Ubuntu=21.04
All of
ubuntu/linux-image-oem-20.04<5.11.0.41.42
5.11.0.41.42
Ubuntu=21.04
All of
ubuntu/linux-image-gke<5.11.0.1023.23
5.11.0.1023.23
Ubuntu=21.04
All of
ubuntu/linux-image-gcp<5.11.0.1023.23
5.11.0.1023.23
Ubuntu=21.04
All of
ubuntu/linux-image-oracle<5.11.0.1022.23
5.11.0.1022.23
Ubuntu=21.04
All of
ubuntu/linux-image-5.11.0-1020-kvm<5.11.0-1020.22
5.11.0-1020.22
Ubuntu=21.04
All of
ubuntu/linux-image-raspi<5.11.0.1023.21
5.11.0.1023.21
Ubuntu=21.04
All of
ubuntu/linux-image-5.11.0-1023-raspi<5.11.0-1023.25
5.11.0-1023.25
Ubuntu=21.04
All of
ubuntu/linux-image-kvm<5.11.0.1020.21
5.11.0.1020.21
Ubuntu=21.04
All of
ubuntu/linux-image-5.11.0-1023-gcp<5.11.0-1023.25
5.11.0-1023.25
Ubuntu=21.04
All of
ubuntu/linux-image-generic-lpae<5.11.0.41.42
5.11.0.41.42
Ubuntu=21.04
All of
ubuntu/linux-image-lowlatency<5.11.0.41.42
5.11.0.41.42
Ubuntu=21.04
All of
ubuntu/linux-image-5.11.0-41-lowlatency<5.11.0-41.45~20.04.1
5.11.0-41.45~20.04.1
Ubuntu=20.04
All of
ubuntu/linux-image-5.11.0-41-generic-64k<5.11.0-41.45~20.04.1
5.11.0-41.45~20.04.1
Ubuntu=20.04
All of
ubuntu/linux-image-virtual-hwe-20.04<5.11.0.41.45~20.04.19
5.11.0.41.45~20.04.19
Ubuntu=20.04
All of
ubuntu/linux-image-aws<5.11.0.1022.23~20.04.21
5.11.0.1022.23~20.04.21
Ubuntu=20.04
All of
ubuntu/linux-image-5.11.0-41-generic-lpae<5.11.0-41.45~20.04.1
5.11.0-41.45~20.04.1
Ubuntu=20.04
All of
ubuntu/linux-image-lowlatency-hwe-20.04<5.11.0.41.45~20.04.19
5.11.0.41.45~20.04.19
Ubuntu=20.04
All of
ubuntu/linux-image-generic-hwe-20.04<5.11.0.41.45~20.04.19
5.11.0.41.45~20.04.19
Ubuntu=20.04
All of
ubuntu/linux-image-5.11.0-1022-aws<5.11.0-1022.23~20.04.1
5.11.0-1022.23~20.04.1
Ubuntu=20.04
All of
ubuntu/linux-image-5.11.0-1022-oracle<5.11.0-1022.23~20.04.1
5.11.0-1022.23~20.04.1
Ubuntu=20.04
All of
ubuntu/linux-image-5.11.0-41-generic<5.11.0-41.45~20.04.1
5.11.0-41.45~20.04.1
Ubuntu=20.04
All of
ubuntu/linux-image-azure<5.11.0.1022.23~20.04.22
5.11.0.1022.23~20.04.22
Ubuntu=20.04
All of
ubuntu/linux-image-5.11.0-1022-azure<5.11.0-1022.23~20.04.1
5.11.0-1022.23~20.04.1
Ubuntu=20.04
All of
ubuntu/linux-image-5.11.0-1023-gcp<5.11.0-1023.25~20.04.1
5.11.0-1023.25~20.04.1
Ubuntu=20.04
All of
ubuntu/linux-image-gcp<5.11.0.1023.25~20.04.22
5.11.0.1023.25~20.04.22
Ubuntu=20.04
All of
ubuntu/linux-image-oracle<5.11.0.1022.23~20.04.15
5.11.0.1022.23~20.04.15
Ubuntu=20.04
All of
ubuntu/linux-image-generic-64k-hwe-20.04<5.11.0.41.45~20.04.19
5.11.0.41.45~20.04.19
Ubuntu=20.04
All of
ubuntu/linux-image-generic-lpae-hwe-20.04<5.11.0.41.45~20.04.19
5.11.0.41.45~20.04.19
Ubuntu=20.04

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-5161-1?

    USN-5161-1 is classified as having a medium severity due to its potential to expose sensitive kernel memory.

  • How do I fix USN-5161-1?

    To fix USN-5161-1, update to the recommended kernel versions provided in the security notice.

  • Which systems are affected by USN-5161-1?

    USN-5161-1 affects Ubuntu 21.04 running specific versions of the Linux kernel.

  • What is the impact of USN-5161-1?

    The impact of USN-5161-1 could allow an attacker to access sensitive information from kernel memory.

  • Who discovered the vulnerability USN-5161-1?

    The vulnerability addressed in USN-5161-1 was discovered by Ilja Van Sprundel.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203