CVE-2026-31751

01/תיאור (מקור, אנגלית)

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.

02/מוצרים מושפעים

linux: linux kernel

03/קישורים8

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