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CVE-2021-47024

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: free queued packets when closing socket As reported by syzbot [1], there is a memory leak while closing the socket.

Published Feb 28, 2024CWE-401EPSS 0.25%

Overview

CVE-2021-47024 is a medium-severity vulnerability. It was published on February 28, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

vsock/virtio: free queued packets when closing socket

As reported by syzbot [1], there is a memory leak while closing the

socket. We partially solved this issue with commit ac03046ece2b

("vsock/virtio: free packets during the socket release"), but we

forgot to drain the RX queue when the socket is definitely closed by

the scheduled work.

To avoid future issues, let's use the new virtio_transport_remove_sock()

to drain the RX queue before removing the socket from the af_vsock lists

calling vsock_remove_sock().

[1] https://syzkaller.appspot.com/bug?extid=24452624fc4c571eedd9

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/27691665145e74a45034a9dccf1150cf1894763aRefgit.kernel.org/stable/c/37c38674ef2f8d7e8629e5d433c37d6c1273d16bRefgit.kernel.org/stable/c/8432b8114957235f42e070a16118a7f750de9d39Refgit.kernel.org/stable/c/b605673b523fe33abeafb2136759bcbc9c1e6ebfRefgit.kernel.org/stable/c/27691665145e74a45034a9dccf1150cf1894763aRefgit.kernel.org/stable/c/37c38674ef2f8d7e8629e5d433c37d6c1273d16bRefgit.kernel.org/stable/c/8432b8114957235f42e070a16118a7f750de9d39Refgit.kernel.org/stable/c/b605673b523fe33abeafb2136759bcbc9c1e6ebf

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47024?

CVE-2021-47024 is a medium-severity vulnerability. It was published on February 28, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47024?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47024?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47024?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47024 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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