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CVE-2024-27437 In the Linux kernel, the following vulnerability has been resolved: vfio/pci: Disable auto-enable of exclusive INTx…
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux 6.9 | earliest → < 6.9 | 6.9 |
| Linux 6.8 | earliest → < 6.8.3 | 6.8.3 |
| Linux 6.7 | earliest → < 6.7.12 | 6.7.12 |
| Linux 6.6 | earliest → < 6.6.24 | 6.6.24 |
| Linux 6.1 | earliest → < 6.1.84 | 6.1.84 |
| Linux 5.15 | earliest → < 5.15.154 | 5.15.154 |
| Linux 5.10 | earliest → < 5.10.215 | 5.10.215 |
| Linux 5.4 | earliest → < 5.4.274 | 5.4.274 |
| Linux | 3.6 | No fix stated |
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| Product | Affected versions | Fixed in |
|---|---|---|
| SIMATIC S7-1500 TM MFP - GNU/Linux subsystem 1.1 | earliest → < 1.1.1 | 1.1.1 |
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