PT-2026-36386 · Linux · Linux Kernel

Published 2026-05-01 · Updated 2026-05-06 · CVE-2026-31751

Positive Technologies (AI Summary)

CVSS v3.1

4.7

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The dt2815 driver crashes when attached to I/O ports without actual hardware present. This occurs because users can attach the driver to arbitrary I/O addresses via the '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, particularly under race conditions. This can lead to a supervisor write access page fault in kernel mode within the dt2815 attach() function.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

CVE-2026-31751

ECHO-FA47-827D-10C3

Affected Products

Linux Kernel

References · 17

• https://git.kernel.org/stable/c/65c528fbeddd88478c210052f6c7b21be4973156 · Patch
• https://git.kernel.org/stable/c/34c8b3a91bdfbe4573650b4cd750ef639101fdc5 · Patch
• https://cve.org/CVERecord?id=CVE-2026-31751 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31751 · Security Note
• https://git.kernel.org/stable/c/8d63161837f1bf8810dbcd2a583c2bbf5ca6d733 · Patch
• https://git.kernel.org/stable/c/0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3 · Patch
• https://osv.dev/vulnerability/BELL-CVE-2026-31751 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-31751 · Vendor Advisory
• https://git.kernel.org/stable/c/34b13250c618d7441508c6ef369144aa8a9b9bfa · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31751 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31751 · Vendor Advisory
• https://git.kernel.org/stable/c/d5d9df8b08d68d083ac57abc2c887dfb1f31af63 · Patch
• https://git.kernel.org/stable/c/d2a786efdb9971f2a647724625da5bbecc994dc9 · Patch
• https://ubuntu.com/security/CVE-2026-31751 · Vendor Advisory
• https://git.kernel.org/stable/c/93853512f565e625df2397f0d8050d6aafd7c3ad · Patch