{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31751","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-03-09T15:48:24.139Z","datePublished":"2026-05-01T14:14:43.551Z","dateUpdated":"2026-05-11T22:15:06.157Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:15:06.157Z"},"descriptions":[{"lang":"en","value":"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/drivers/dt2815.c"],"versions":[{"version":"d6a929b7608ae157cef86d00cc580d1038f0b985","lessThan":"8d63161837f1bf8810dbcd2a583c2bbf5ca6d733","status":"affected","versionType":"git"},{"version":"d6a929b7608ae157cef86d00cc580d1038f0b985","lessThan":"d2a786efdb9971f2a647724625da5bbecc994dc9","status":"affected","versionType":"git"},{"version":"d6a929b7608ae157cef86d00cc580d1038f0b985","lessThan":"0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3","status":"affected","versionType":"git"},{"version":"d6a929b7608ae157cef86d00cc580d1038f0b985","lessThan":"d5d9df8b08d68d083ac57abc2c887dfb1f31af63","status":"affected","versionType":"git"},{"version":"d6a929b7608ae157cef86d00cc580d1038f0b985","lessThan":"65c528fbeddd88478c210052f6c7b21be4973156","status":"affected","versionType":"git"},{"version":"d6a929b7608ae157cef86d00cc580d1038f0b985","lessThan":"34c8b3a91bdfbe4573650b4cd750ef639101fdc5","status":"affected","versionType":"git"},{"version":"d6a929b7608ae157cef86d00cc580d1038f0b985","lessThan":"34b13250c618d7441508c6ef369144aa8a9b9bfa","status":"affected","versionType":"git"},{"version":"d6a929b7608ae157cef86d00cc580d1038f0b985","lessThan":"93853512f565e625df2397f0d8050d6aafd7c3ad","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/drivers/dt2815.c"],"versions":[{"version":"2.6.30","status":"affected"},{"version":"0","lessThan":"2.6.30","status":"unaffected","versionType":"semver"},{"version":"5.10.253","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.203","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.168","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.134","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.81","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.22","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.12","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.6.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.12.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.18.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.19.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/8d63161837f1bf8810dbcd2a583c2bbf5ca6d733"},{"url":"https://git.kernel.org/stable/c/d2a786efdb9971f2a647724625da5bbecc994dc9"},{"url":"https://git.kernel.org/stable/c/0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3"},{"url":"https://git.kernel.org/stable/c/d5d9df8b08d68d083ac57abc2c887dfb1f31af63"},{"url":"https://git.kernel.org/stable/c/65c528fbeddd88478c210052f6c7b21be4973156"},{"url":"https://git.kernel.org/stable/c/34c8b3a91bdfbe4573650b4cd750ef639101fdc5"},{"url":"https://git.kernel.org/stable/c/34b13250c618d7441508c6ef369144aa8a9b9bfa"},{"url":"https://git.kernel.org/stable/c/93853512f565e625df2397f0d8050d6aafd7c3ad"}],"title":"comedi: dt2815: add hardware detection to prevent crash","x_generator":{"engine":"bippy-1.2.0"}}}}