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comedi: comedi_parport: deal with premature interrupt

Type: advisorySource: OSV1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-68182

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:CVE-2026-68182

Kernel

Source reference: /affected/1/package/name

Affected versions
Not stated in this record
Fixed versions
5.10.265

Source reference: /affected/1/ranges

5.15.216

Source reference: /affected/1/ranges

6.1.183

Source reference: /affected/1/ranges

6.6.148

Source reference: /affected/1/ranges

6.12.101

Source reference: /affected/1/ranges

6.18.42

Source reference: /affected/1/ranges

7.1.6

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

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            "introduced": "241ab6ad7108e51c67881f7881c5e46f0400cdb1"
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            "fixed": "48ef18e5eb6b8a9c546038b2ab89a841fcd97fe7"
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            "fixed": "a88b25db815ff6edace81b0bb0f4a201133bd215"
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          {
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          {
            "fixed": "cf26dd2d841583c54a87005c4934b92fddb930c3"
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          {
            "fixed": "5d059ce0e6a2f6f8b97273499d47b8f917097b48"
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            "fixed": "17221216ae8ce6a24e8a4e787382e3ebc81b88a8"
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        ]
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    ],
    "package": {
      "name": "Kernel",
      "ecosystem": "Linux"
    },
    "database_specific": {
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    }
  }
]
Related CVEs
CVE-2026-68182

Source reference: /id

Publisher severity

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Event
#50776 · Revision 1
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