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vuln-cve/data/2025/38xxx/CVE-2025-38480.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-38480",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T04:51:24.021Z",
"datePublished": "2025-07-28T11:21:45.142Z",
"dateUpdated": "2026-05-11T21:28:49.584Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-05-11T21:28:49.584Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: Fix use of uninitialized data in insn_rw_emulate_bits()\n\nFor Comedi `INSN_READ` and `INSN_WRITE` instructions on \"digital\"\nsubdevices (subdevice types `COMEDI_SUBD_DI`, `COMEDI_SUBD_DO`, and\n`COMEDI_SUBD_DIO`), it is common for the subdevice driver not to have\n`insn_read` and `insn_write` handler functions, but to have an\n`insn_bits` handler function for handling Comedi `INSN_BITS`\ninstructions. In that case, the subdevice's `insn_read` and/or\n`insn_write` function handler pointers are set to point to the\n`insn_rw_emulate_bits()` function by `__comedi_device_postconfig()`.\n\nFor `INSN_WRITE`, `insn_rw_emulate_bits()` currently assumes that the\nsupplied `data[0]` value is a valid copy from user memory. It will at\nleast exist because `do_insnlist_ioctl()` and `do_insn_ioctl()` in\n\"comedi_fops.c\" ensure at lease `MIN_SAMPLES` (16) elements are\nallocated. However, if `insn->n` is 0 (which is allowable for\n`INSN_READ` and `INSN_WRITE` instructions, then `data[0]` may contain\nuninitialized data, and certainly contains invalid data, possibly from a\ndifferent instruction in the array of instructions handled by\n`do_insnlist_ioctl()`. This will result in an incorrect value being\nwritten to the digital output channel (or to the digital input/output\nchannel if configured as an output), and may be reflected in the\ninternal saved state of the channel.\n\nFix it by returning 0 early if `insn->n` is 0, before reaching the code\nthat accesses `data[0]`. Previously, the function always returned 1 on\nsuccess, but it is supposed to be the number of data samples actually\nread or written up to `insn->n`, which is 0 in this case."
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/comedi/drivers.c"
],
"versions": [
{
"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
"lessThan": "4c2981bf30401adfcdbfece4ab6f411f7c5875a1",
"status": "affected",
"versionType": "git"
},
{
"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
"lessThan": "16256d7efcf7acc9f39abe21522c4c6b77f67c00",
"status": "affected",
"versionType": "git"
},
{
"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
"lessThan": "c53570e62b5b28bdb56bb563190227f8307817a5",
"status": "affected",
"versionType": "git"
},
{
"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
"lessThan": "3050d197d6bc9ef128944a70210f42d2430b3000",
"status": "affected",
"versionType": "git"
},
{
"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
"lessThan": "10f9024a8c824a41827fff1fefefb314c98e2c88",
"status": "affected",
"versionType": "git"
},
{
"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
"lessThan": "2af1e7d389c2619219171d23f5b96dbcbb7f9656",
"status": "affected",
"versionType": "git"
},
{
"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
"lessThan": "3ab55ffaaf75d0c7b68e332c1cdcc1b0e0044870",
"status": "affected",
"versionType": "git"
},
{
"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
"lessThan": "e9cb26291d009243a4478a7ffb37b3a9175bfce9",
"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.c"
],
"versions": [
{
"version": "2.6.29",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.29",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.4.297",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.241",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.190",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.147",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.100",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.40",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.15.8",
"lessThanOrEqual": "6.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.16",
"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": "2.6.29",
"versionEndExcluding": "5.4.297"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.29",
"versionEndExcluding": "5.10.241"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.29",
"versionEndExcluding": "5.15.190"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.29",
"versionEndExcluding": "6.1.147"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.29",
"versionEndExcluding": "6.6.100"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.29",
"versionEndExcluding": "6.12.40"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.29",
"versionEndExcluding": "6.15.8"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.29",
"versionEndExcluding": "6.16"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/4c2981bf30401adfcdbfece4ab6f411f7c5875a1"
},
{
"url": "https://git.kernel.org/stable/c/16256d7efcf7acc9f39abe21522c4c6b77f67c00"
},
{
"url": "https://git.kernel.org/stable/c/c53570e62b5b28bdb56bb563190227f8307817a5"
},
{
"url": "https://git.kernel.org/stable/c/3050d197d6bc9ef128944a70210f42d2430b3000"
},
{
"url": "https://git.kernel.org/stable/c/10f9024a8c824a41827fff1fefefb314c98e2c88"
},
{
"url": "https://git.kernel.org/stable/c/2af1e7d389c2619219171d23f5b96dbcbb7f9656"
},
{
"url": "https://git.kernel.org/stable/c/3ab55ffaaf75d0c7b68e332c1cdcc1b0e0044870"
},
{
"url": "https://git.kernel.org/stable/c/e9cb26291d009243a4478a7ffb37b3a9175bfce9"
}
],
"title": "comedi: Fix use of uninitialized data in insn_rw_emulate_bits()",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"title": "CVE Program Container",
"references": [
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
},
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
}
],
"providerMetadata": {
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE",
"dateUpdated": "2025-11-03T17:38:48.508Z"
}
}
]
}
}
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