CVE-2026-31751 Details
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.
A vulnerability in the Linux kernel's Comedi DT2815 driver can lead to a crash when the driver is attached to I/O ports without actual hardware. This issue arises because the driver can be connected to arbitrary I/O addresses via the COMEDI_DEVCONFIG ioctl. When no hardware is present at the specified port, input operations return 0xff (indicating a floating bus), while output operations can cause page faults due to undefined behavior, particularly under race conditions. The vulnerability has been addressed by adding hardware detection to the driver, ensuring it only attempts to communicate with I/O ports that have actual hardware present.
The vulnerability has been fixed in the Linux kernel by adding a check for hardware presence before attempting any I/O operations. Users should update to the latest version of the Linux kernel where this fix has been applied.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3 | kernel.org | Patch |
| https://git.kernel.org/stable/c/34b13250c618d7441508c6ef369144aa8a9b9bfa | kernel.org | Patch |
| https://git.kernel.org/stable/c/34c8b3a91bdfbe4573650b4cd750ef639101fdc5 | kernel.org | Patch |
| https://git.kernel.org/stable/c/65c528fbeddd88478c210052f6c7b21be4973156 | kernel.org | Patch |
| https://git.kernel.org/stable/c/8d63161837f1bf8810dbcd2a583c2bbf5ca6d733 | kernel.org | Patch |
| https://git.kernel.org/stable/c/93853512f565e625df2397f0d8050d6aafd7c3ad | kernel.org | Patch |
| https://git.kernel.org/stable/c/d2a786efdb9971f2a647724625da5bbecc994dc9 | kernel.org | Patch |
| https://git.kernel.org/stable/c/d5d9df8b08d68d083ac57abc2c887dfb1f31af63 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-362 | Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 2.6.30, < 5.10.253 >= 5.11, < 5.15.203 >= 5.16, < 6.1.168 >= 6.2, < 6.6.134 >= 6.7, < 6.12.81 >= 6.13, < 6.18.22 >= 6.19, < 6.19.12 7.0 rc1 7.0 rc2 7.0 rc3 7.0 rc4 7.0 rc5 7.0 rc6 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 7, 2026 | Initial Analysis | [email protected] |
| May 1, 2026 | New CVE Received | kernel.org |