{"id":"CVE-2025-38478","revision":"220129a5cf0e4d158ea7829c18880082","records":[{"revision":"220129a5cf0e4d158ea7829c18880082","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-38478","aliases":[],"title":"comedi: Fix initialization of data for instructions that write to subdevice","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: Fix initialization of data for instructions that write to subdevice\n\nSome Comedi subdevice instruction handlers are known to access\ninstruction data elements beyond the first `insn->n` elements in some\ncases.  The `do_insn_ioctl()` and `do_insnlist_ioctl()` functions\nallocate at least `MIN_SAMPLES` (16) data elements to deal with this,\nbut they do not initialize all of that.  For Comedi instruction codes\nthat write to the subdevice, the first `insn->n` data elements are\ncopied from user-space, but the remaining elements are left\nuninitialized.  That could be a problem if the subdevice instruction\nhandler reads the uninitialized data.  Ensure that the first\n`MIN_SAMPLES` elements are initialized before calling these instruction\nhandlers, filling the uncopied elements with 0.  For\n`do_insnlist_ioctl()`, the same data buffer elements are used for\nhandling a list of instructions, so ensure the first `MIN_SAMPLES`\nelements are initialized for each instruction that writes to the\nsubdevice.","state":0,"publishedAt":"2025-07-28T11:21:44.21+00:00","modifiedAt":"2026-10-15T21:52:17.239+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/comedi/comedi_fops.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"ed9eccbe8970f6eedc1b978c157caf1251a896d4\",\n                            \"lessThan\": \"6f38c6380c3b38a05032b8881e41137385a6ce02\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ed9eccbe8970f6eedc1b978c157caf1251a896d4\",\n                            \"lessThan\": \"13e4d9038a1e869445a996a3f604a84ef52fe8f4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ed9eccbe8970f6eedc1b978c157caf1251a896d4\",\n                            \"lessThan\": \"020eed5681d0f9bced73970368078a92d6cfaa9c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ed9eccbe8970f6eedc1b978c157caf1251a896d4\",\n                            \"lessThan\": \"d3436638738ace8f101af7bdee2eae1bc38e9b29\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ed9eccbe8970f6eedc1b978c157caf1251a896d4\",\n                            \"lessThan\": \"673ee92bd2d31055bca98a1d96b653f5284289c4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ed9eccbe8970f6eedc1b978c157caf1251a896d4\",\n                            \"lessThan\": \"c42116dc70af6664526f7aa82cf937824ab42649\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ed9eccbe8970f6eedc1b978c157caf1251a896d4\",\n                            \"lessThan\": \"fe8713fb4e4e82a4f91910d9a41bf0613e69a0b9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ed9eccbe8970f6eedc1b978c157caf1251a896d4\",\n                            \"lessThan\": \"46d8c744136ce2454aa4c35c138cc06817f92b8e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/comedi/comedi_fops.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.29\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.29\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.4.297\",\n                            \"lessThanOrEqual\": \"5.4.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.241\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.190\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.147\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.100\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.40\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.15.8\",\n                            \"lessThanOrEqual\": \"6.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.16\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/6f38c6380c3b38a05032b8881e41137385a6ce02","https://git.kernel.org/stable/c/13e4d9038a1e869445a996a3f604a84ef52fe8f4","https://git.kernel.org/stable/c/020eed5681d0f9bced73970368078a92d6cfaa9c","https://git.kernel.org/stable/c/d3436638738ace8f101af7bdee2eae1bc38e9b29","https://git.kernel.org/stable/c/673ee92bd2d31055bca98a1d96b653f5284289c4","https://git.kernel.org/stable/c/c42116dc70af6664526f7aa82cf937824ab42649","https://git.kernel.org/stable/c/fe8713fb4e4e82a4f91910d9a41bf0613e69a0b9","https://git.kernel.org/stable/c/46d8c744136ce2454aa4c35c138cc06817f92b8e"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-38478","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-38478","identifiers":["CVE-2025-38478"]},"retained":false,"historicalAffected":[]}],"coverage":[]}