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CVE-2024-27437

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: vfio/pci: Disable auto-enable of exclusive INTx IRQ Currently for devices requiring masking at the irqchip for INTx, ie.

Published Apr 5, 2024EPSS 0.24%

Overview

CVE-2024-27437 is a medium-severity vulnerability. It was published on April 5, 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:

vfio/pci: Disable auto-enable of exclusive INTx IRQ

Currently for devices requiring masking at the irqchip for INTx, ie.

devices without DisINTx support, the IRQ is enabled in request_irq()

and subsequently disabled as necessary to align with the masked status

flag. This presents a window where the interrupt could fire between

these events, resulting in the IRQ incrementing the disable depth twice.

This would be unrecoverable for a user since the masked flag prevents

nested enables through vfio.

Instead, invert the logic using IRQF_NO_AUTOEN such that exclusive INTx

is never auto-enabled, then unmask as required.

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/139dfcc4d723ab13469881200c7d80f49d776060Refgit.kernel.org/stable/c/26389925d6c2126fb777821a0a983adca7ee6351Refgit.kernel.org/stable/c/2a4a666c45107206605b7b5bc20545f8aabc4fa2Refgit.kernel.org/stable/c/3b3491ad0f80d913e7d255941d4470f4a4d9bfdaRefgit.kernel.org/stable/c/561d5e1998d58b54ce2bbbb3e843b669aa0b3db5Refgit.kernel.org/stable/c/b7a2f0955ffceffadfe098b40b50307431f45438Refgit.kernel.org/stable/c/bf0bc84a20e6109ab07d5dc072067bd01eb931ecRefgit.kernel.org/stable/c/fe9a7082684eb059b925c535682e68c34d487d43Refgit.kernel.org/stable/c/139dfcc4d723ab13469881200c7d80f49d776060Refgit.kernel.org/stable/c/26389925d6c2126fb777821a0a983adca7ee6351

How CyberStrike helps

Frequently asked questions

What is CVE-2024-27437?

CVE-2024-27437 is a medium-severity vulnerability. It was published on April 5, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-27437?

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-2024-27437?

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-2024-27437?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-27437 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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