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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2024-26812

vfio/pci: Create persistent INTx handler

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: vfio/pci: Create persistent INTx handler A vulnerability exists where the eventfd for INTx signaling can be deconfigured, which unregisters the IRQ handler but still allows eventfds to be signaled with a NULL context through the SET_IRQS ioctl or through unmask irqfd if the device interrupt is pending. Ideally this could be solved with some additional locking; the igate mutex serializes the ioctl and config space accesses, and the interrupt handler is unregistered relative to the trigger, but the irqfd path runs asynchronous to those. The igate mutex cannot be acquired from the atomic context of the eventfd wake function. Disabling the irqfd relative to the eventfd registration is potentially incompatible with existing userspace. As a result, the solution implemented here moves configuration of the INTx interrupt handler to track the lifetime of the INTx context object and irq_type configuration, rather than registration of a particular trigger eventfd. Synchronization is added between the ioctl path and eventfd_signal() wrapper such that the eventfd trigger can be dynamically updated relative to in-flight interrupts or irqfd callbacks.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 to < b18fa894d615c8527e15d96b76c7448800e13899affected
  • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 to < 27d40bf72dd9a6600b76ad05859176ea9a1b4897affected
  • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 to < 4cb0d7532126d23145329826c38054b4e9a05e7caffected
  • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 to < 7d29d4c72c1e196cce6969c98072a272d1a703b3affected
  • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 to < 69276a555c740acfbff13fb5769ee9c92e1c828eaffected
  • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 to < 4c089cefe30924fbe20dd1ee92774ea1f5eca834affected
  • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 to < 0e09cf81959d9f12b75ad5c6dd53d237432ed034affected
  • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 to < 18c198c96a815c962adc2b9b77909eec0be7df4daffected

Linux Linux

Default version status: affected

  • 3.6affected
  • 0 to < 3.6unaffected
  • 5.4.274 to ≤ 5.4.*unaffected
  • 5.10.215 to ≤ 5.10.*unaffected
  • 5.15.154 to ≤ 5.15.*unaffected
  • 6.1.84 to ≤ 6.1.*unaffected
  • 6.6.24 to ≤ 6.6.*unaffected
  • 6.7.12 to ≤ 6.7.*unaffected
  • 6.8.3 to ≤ 6.8.*unaffected
  • 6.9 to ≤ *unaffected

References