CVE-2026-31751

MEDIUM EPSS 0.6%
Published May 1, 20262mo ago · Modified Jun 17, 20262w ago
4.7 CVSS 3.1
Medium
Find Similar
Published May 1, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

Description

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 Details

Base Score
4.7
Exploitability
1.0
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
0.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-362

Affected Products 13

VendorProductVersionRange
linuxlinux_kernel*≥2.6.30  –  <5.10.253
linuxlinux_kernel*≥5.11  –  <5.15.203
linuxlinux_kernel*≥5.16  –  <6.1.168
linuxlinux_kernel*≥6.2  –  <6.6.134
linuxlinux_kernel*≥6.7  –  <6.12.81
linuxlinux_kernel*≥6.13  –  <6.18.22
linuxlinux_kernel*≥6.19  –  <6.19.12
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 8

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

Remediation

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