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PUBLISHED

CVE-2024-27437

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

Reserved:2024-02-25
Published:2024-04-05
Updated:2024-05-13

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.

Product status

Default status
unaffected

89e1f7d4c66d before 26389925d6c2
affected

89e1f7d4c66d before 561d5e1998d5
affected

89e1f7d4c66d before b7a2f0955ffc
affected

89e1f7d4c66d before 139dfcc4d723
affected

89e1f7d4c66d before 2a4a666c4510
affected

89e1f7d4c66d before 3b3491ad0f80
affected

89e1f7d4c66d before bf0bc84a20e6
affected

89e1f7d4c66d before fe9a7082684e
affected

Default status
affected

3.6
affected

Any version before 3.6
unaffected

5.4.274
unaffected

5.10.215
unaffected

5.15.154
unaffected

6.1.84
unaffected

6.6.24
unaffected

6.7.12
unaffected

6.8.3
unaffected

6.9
unaffected

References

https://git.kernel.org/stable/c/26389925d6c2126fb777821a0a983adca7ee6351

https://git.kernel.org/stable/c/561d5e1998d58b54ce2bbbb3e843b669aa0b3db5

https://git.kernel.org/stable/c/b7a2f0955ffceffadfe098b40b50307431f45438

https://git.kernel.org/stable/c/139dfcc4d723ab13469881200c7d80f49d776060

https://git.kernel.org/stable/c/2a4a666c45107206605b7b5bc20545f8aabc4fa2

https://git.kernel.org/stable/c/3b3491ad0f80d913e7d255941d4470f4a4d9bfda

https://git.kernel.org/stable/c/bf0bc84a20e6109ab07d5dc072067bd01eb931ec

https://git.kernel.org/stable/c/fe9a7082684eb059b925c535682e68c34d487d43

cve.org CVE-2024-27437

nvd.nist.gov CVE-2024-27437

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