CVE-2024-27437

MediumCVSS 5.5/10Last modified Oct 15, 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.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected software

VendorProductVersions
LinuxLinux>= 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153, < 26389925d6c2126fb777821a0a983adca7ee6351; >= 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153, < 561d5e1998d58b54ce2bbbb3e843b669aa0b3db5; >= 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153, < b7a2f0955ffceffadfe098b40b50307431f45438; >= 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153, < 139dfcc4d723ab13469881200c7d80f49d776060; >= 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153, < 2a4a666c45107206605b7b5bc20545f8aabc4fa2; >= 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153, < 3b3491ad0f80d913e7d255941d4470f4a4d9bfda; >= 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153, < bf0bc84a20e6109ab07d5dc072067bd01eb931ec; >= 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153, < fe9a7082684eb059b925c535682e68c34d487d43
LinuxLinux3.6
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystem< V1.1.1

References

Timeline

Published
Apr 5, 2024
Last modified
Oct 15, 2026
NVD status
Modified

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CVE-2024-27437: Medium severity, CVSS 5.5 | Vulnix