CVE-2026-31751
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.
Debolezza
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.
Prodotti interessati
- linux linux_kernel
Riferimenti
- https://git.kernel.org/stable/c/0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3
- https://git.kernel.org/stable/c/34b13250c618d7441508c6ef369144aa8a9b9bfa
- https://git.kernel.org/stable/c/34c8b3a91bdfbe4573650b4cd750ef639101fdc5
- https://git.kernel.org/stable/c/65c528fbeddd88478c210052f6c7b21be4973156
- https://git.kernel.org/stable/c/8d63161837f1bf8810dbcd2a583c2bbf5ca6d733
- https://git.kernel.org/stable/c/93853512f565e625df2397f0d8050d6aafd7c3ad
Trova il bug prima di un attaccante.
Accedi con GitHub e avvia il tuo primo audit in meno di un minuto. Il piano gratuito non richiede carta di credito.