Medium 4.7Published May 1, 2026

CVE-2026-31751comedi: dt2815: add hardware detection to prevent crash

Updated under an hour ago (Oct 28, 2026, 7:23 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: comedi: dt2815: add hardware detection to prevent crash The dt2815 driver crashes when attached to I/O ports without actual hardware present. This occurs because syzkaller or users can attach the driver to arbitrary I/O addresses via COMEDI_DEVCONFIG ioctl. When no hardware exists at the specified port, inb() operations return 0xff (floating bus), but outb() operations can trigger page faults due to undefined behavior, especially under race conditions: BUG: unable to handle page fault for address: 000000007fffff90 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page RIP: 0010:dt2815_attach+0x6e0/0x1110 Add hardware detection by reading the status register before attempting any write operations. If the read returns 0xff, assume no hardware is present and fail the attach with -ENODEV. This prevents crashes from outb() operations on non-existent hardware.

CVSS: 4.7 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from d6a929b7608ae157cef86d00cc580d1038f0b985 before 8d63161837f1bf8810dbcd2a583c2bbf5ca6d733; from d6a929b7608ae157cef86d00cc580d1038f0b985 before d2a786efdb9971f2a647724625da5bbecc994dc9; from d6a929b7608ae157cef86d00cc580d1038f0b985 before 0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3; from d6a929b7608ae157cef86d00cc580d1038f0b985 before d5d9df8b08d68d083ac57abc2c887dfb1f31af63; from d6a929b7608ae157cef86d00cc580d1038f0b985 before 65c528fbeddd88478c210052f6c7b21be4973156; from d6a929b7608ae157cef86d00cc580d1038f0b985 before 34c8b3a91bdfbe4573650b4cd750ef639101fdc5; from d6a929b7608ae157cef86d00cc580d1038f0b985 before 34b13250c618d7441508c6ef369144aa8a9b9bfa; from d6a929b7608ae157cef86d00cc580d1038f0b985 before 93853512f565e625df2397f0d8050d6aafd7c3ad	CNA record
linux linux_kernel linux:linux_kernel	from 2.6.30 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12; 7.0; and 5 more ranges	NVD

References

References

https://git.kernel.org/stable/c/8d63161837f1bf8810dbcd2a583c2bbf5ca6d733	patch
https://git.kernel.org/stable/c/d2a786efdb9971f2a647724625da5bbecc994dc9	patch
https://git.kernel.org/stable/c/0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3	patch
https://git.kernel.org/stable/c/d5d9df8b08d68d083ac57abc2c887dfb1f31af63	patch
https://git.kernel.org/stable/c/65c528fbeddd88478c210052f6c7b21be4973156	patch
https://git.kernel.org/stable/c/34c8b3a91bdfbe4573650b4cd750ef639101fdc5	patch
https://git.kernel.org/stable/c/34b13250c618d7441508c6ef369144aa8a9b9bfa	patch
https://git.kernel.org/stable/c/93853512f565e625df2397f0d8050d6aafd7c3ad	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.