comedi: dt2815: add hardware detection to prevent crash

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Summary

CVECVE-2026-31751
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:37 UTC
Updated2026-05-07 19:11:00 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000240000 probability, percentile 0.068060000 (date 2026-05-05)

Problem Types: CWE-362

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d6a929b7608ae157cef86d00cc580d1038f0b985 8d63161837f1bf8810dbcd2a583c2bbf5ca6d733 git Not specified
CNA Linux Linux affected d6a929b7608ae157cef86d00cc580d1038f0b985 d2a786efdb9971f2a647724625da5bbecc994dc9 git Not specified
CNA Linux Linux affected d6a929b7608ae157cef86d00cc580d1038f0b985 0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3 git Not specified
CNA Linux Linux affected d6a929b7608ae157cef86d00cc580d1038f0b985 d5d9df8b08d68d083ac57abc2c887dfb1f31af63 git Not specified
CNA Linux Linux affected d6a929b7608ae157cef86d00cc580d1038f0b985 65c528fbeddd88478c210052f6c7b21be4973156 git Not specified
CNA Linux Linux affected d6a929b7608ae157cef86d00cc580d1038f0b985 34c8b3a91bdfbe4573650b4cd750ef639101fdc5 git Not specified
CNA Linux Linux affected d6a929b7608ae157cef86d00cc580d1038f0b985 34b13250c618d7441508c6ef369144aa8a9b9bfa git Not specified
CNA Linux Linux affected d6a929b7608ae157cef86d00cc580d1038f0b985 93853512f565e625df2397f0d8050d6aafd7c3ad git Not specified
CNA Linux Linux affected 2.6.30 Not specified
CNA Linux Linux unaffected 2.6.30 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/34b13250c618d7441508c6ef369144aa8a9b9bfa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8d63161837f1bf8810dbcd2a583c2bbf5ca6d733 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/65c528fbeddd88478c210052f6c7b21be4973156 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d2a786efdb9971f2a647724625da5bbecc994dc9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d5d9df8b08d68d083ac57abc2c887dfb1f31af63 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/93853512f565e625df2397f0d8050d6aafd7c3ad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/34c8b3a91bdfbe4573650b4cd750ef639101fdc5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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