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.
| Product | Vendor | Version |
|---|---|---|
| Linux | Linux | < V1.0.2 |
| Linux | Linux | All versions |
| Linux | Linux | SINUMERIK 808D V4.7 : All versions |
| Linux | Linux | SINUMERIK 840D sl V4.7 : All versions < V4.7 SP6 HF5 |