{"cve":"CVE-2026-31751","nvd":{"published":"2026-05-01T15:16:37.960","modified":"2026-06-17T10:34:23.743","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: dt2815: add hardware detection to prevent crash\n\nThe dt2815 driver crashes when attached to I/O ports without actual\nhardware present. This occurs because syzkaller or users can attach\nthe driver to arbitrary I/O addresses via COMEDI_DEVCONFIG ioctl.\n\nWhen no hardware exists at the specified port, inb() operations return\n0xff (floating bus), but outb() operations can trigger page faults due\nto undefined behavior, especially under race conditions:\n\n  BUG: unable to handle page fault for address: 000000007fffff90\n  #PF: supervisor write access in kernel mode\n  #PF: error_code(0x0002) - not-present page\n  RIP: 0010:dt2815_attach+0x6e0/0x1110\n\nAdd hardware detection by reading the status register before attempting\nany write operations. If the read returns 0xff, assume no hardware is\npresent and fail the attach with -ENODEV. This prevents crashes from\noutb() operations on non-existent hardware.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","score":4.7},"cwes":["CWE-362"],"references":["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"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:33:09.003606135+00:00"},"epss":{"cve":"CVE-2026-31751","score":0.00089,"percentile":0.00394,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}