CVE-2024-27437

MEDIUM
Published Apr 5, 2024 Modified May 12, 2026

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.

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
debian debian_linux

References

Advisories & Patches

https://git.kernel.org/stable/c/139dfcc4d723ab13469881200c7d80f49d776060 https://git.kernel.org/stable/c/26389925d6c2126fb777821a0a983adca7ee6351 https://git.kernel.org/stable/c/2a4a666c45107206605b7b5bc20545f8aabc4fa2 https://git.kernel.org/stable/c/3b3491ad0f80d913e7d255941d4470f4a4d9bfda https://git.kernel.org/stable/c/561d5e1998d58b54ce2bbbb3e843b669aa0b3db5 https://git.kernel.org/stable/c/b7a2f0955ffceffadfe098b40b50307431f45438 https://git.kernel.org/stable/c/bf0bc84a20e6109ab07d5dc072067bd01eb931ec https://git.kernel.org/stable/c/fe9a7082684eb059b925c535682e68c34d487d43 https://git.kernel.org/stable/c/139dfcc4d723ab13469881200c7d80f49d776060 https://git.kernel.org/stable/c/26389925d6c2126fb777821a0a983adca7ee6351 https://git.kernel.org/stable/c/2a4a666c45107206605b7b5bc20545f8aabc4fa2 https://git.kernel.org/stable/c/3b3491ad0f80d913e7d255941d4470f4a4d9bfda https://git.kernel.org/stable/c/561d5e1998d58b54ce2bbbb3e843b669aa0b3db5 https://git.kernel.org/stable/c/b7a2f0955ffceffadfe098b40b50307431f45438 https://git.kernel.org/stable/c/bf0bc84a20e6109ab07d5dc072067bd01eb931ec https://git.kernel.org/stable/c/fe9a7082684eb059b925c535682e68c34d487d43

Frequently Asked Questions

What is CVE-2024-27437? +
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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2024-27437? +
CVE-2024-27437 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2024-27437? +
CVE-2024-27437 affects products from debian, linux, specifically: debian_linux, linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2024-27437? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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