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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-68182

comedi: comedi_parport: deal with premature interrupt

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: comedi: comedi_parport: deal with premature interrupt Syzbot reported a general protection fault in `comedi_get_is_subdevice_running()`, which was called from the interrupt handler `parport_interrupt()` in the "comedi_parport" driver, but it does not currently have a C reproducer for the problem. It's probably due to a premature interrupt for one of two reasons: 1. The driver sets up the interrupt handler before the comedi subdevices used by the interrupt handler have been allocated, but does not disable the interrupt in the parallel port's CTRL register first. 2. The driver uses a user-supplied I/O port base address which Syzbot would have supplied, but it might not be backed by real parallel port hardware. Change the initialization order in the driver's comedi "attach" handler (`parport_attach()`) so that the hardware registers are initialized before the interrupt handler is requested. This should prevent premature interrupts occurring for real hardware. Also add a test to the interrupt handler to ensure the comedi device is fully attached and return early if it isn't.

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

  • 241ab6ad7108e51c67881f7881c5e46f0400cdb1 to < 6ed34611e569fc1a1169905c5228fd0eb2806c1baffected
  • 241ab6ad7108e51c67881f7881c5e46f0400cdb1 to < 48ef18e5eb6b8a9c546038b2ab89a841fcd97fe7affected
  • 241ab6ad7108e51c67881f7881c5e46f0400cdb1 to < a88b25db815ff6edace81b0bb0f4a201133bd215affected
  • 241ab6ad7108e51c67881f7881c5e46f0400cdb1 to < b061bb4dca49fd93063359d3805387235818778caffected
  • 241ab6ad7108e51c67881f7881c5e46f0400cdb1 to < 086a9ae3c5df63ec11033a8c0b3f6a1fd295ddd1affected
  • 241ab6ad7108e51c67881f7881c5e46f0400cdb1 to < cf26dd2d841583c54a87005c4934b92fddb930c3affected
  • 241ab6ad7108e51c67881f7881c5e46f0400cdb1 to < 5d059ce0e6a2f6f8b97273499d47b8f917097b48affected
  • 241ab6ad7108e51c67881f7881c5e46f0400cdb1 to < 17221216ae8ce6a24e8a4e787382e3ebc81b88a8affected

Linux Linux

Default version status: affected

  • 2.6.29affected
  • 0 to < 2.6.29unaffected
  • 5.10.265 to ≤ 5.10.*unaffected
  • 5.15.216 to ≤ 5.15.*unaffected
  • 6.1.183 to ≤ 6.1.*unaffected
  • 6.6.148 to ≤ 6.6.*unaffected
  • 6.12.101 to ≤ 6.12.*unaffected
  • 6.18.42 to ≤ 6.18.*unaffected
  • 7.1.6 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References