Advisory Published

USN-7234-4: Linux kernel (AWS) vulnerabilities

First published: Wed Feb 12 2025(Updated: )

Ye Zhang and Nicolas Wu discovered that the io_uring subsystem in the Linux kernel did not properly handle locking for rings with IOPOLL, leading to a double-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-21400) Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems:

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-5.4.0-1139-aws<5.4.0-1139.149
5.4.0-1139.149
Ubuntu=20.04
All of
ubuntu/linux-image-aws-lts-20.04<5.4.0.1139.136
5.4.0.1139.136
Ubuntu=20.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-7234-4?

    USN-7234-4 is classified as a high severity vulnerability due to its potential to cause system crashes or arbitrary code execution.

  • How do I fix USN-7234-4?

    To fix USN-7234-4, update to the patched kernel version 5.4.0-1139.149 or 5.4.0-1139.136 depending on your system.

  • What systems are affected by USN-7234-4?

    USN-7234-4 affects Ubuntu 20.04 systems running specific versions of the Linux kernel, including linux-image-5.4.0-1139-aws and linux-image-aws-lts-20.04.

  • Can USN-7234-4 be exploited remotely?

    USN-7234-4 requires local access to exploit, meaning it cannot be exploited remotely.

  • What are the potential effects of USN-7234-4?

    The potential effects of USN-7234-4 include denial of service through system crashes and the possibility of arbitrary code execution.

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