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CVE-2024-42108

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: net: rswitch: Avoid use-after-free in rswitch_poll() The use-after-free is actually in rswitch_tx_free(), which is inlined in r…

Published Jul 30, 2024CWE-416EPSS 0.63%

Overview

CVE-2024-42108 is a critical-severity vulnerability. It was published on July 30, 2024 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

net: rswitch: Avoid use-after-free in rswitch_poll()

The use-after-free is actually in rswitch_tx_free(), which is inlined in

rswitch_poll(). Since `skb` and `gq->skbs[gq->dirty]` are in fact the

same pointer, the skb is first freed using dev_kfree_skb_any(), then the

value in skb->len is used to update the interface statistics.

Let's move around the instructions to use skb->len before the skb is

freed.

This bug is trivial to reproduce using KFENCE. It will trigger a splat

every few packets. A simple ARP request or ICMP echo request is enough.

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/4a41bb9f2b402469d425a1c13359d3b3ea4e6403Refgit.kernel.org/stable/c/92cbbe7759193e3418f38d0d73f8fe125312c58bRefgit.kernel.org/stable/c/9a0c28efeec6383ef22e97437616b920e7320b67Refgit.kernel.org/stable/c/92cbbe7759193e3418f38d0d73f8fe125312c58bRefgit.kernel.org/stable/c/9a0c28efeec6383ef22e97437616b920e7320b67

How CyberStrike helps

Frequently asked questions

What is CVE-2024-42108?

CVE-2024-42108 is a critical-severity vulnerability. It was published on July 30, 2024 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2024-42108?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2024-42108?

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-2024-42108?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-42108 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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