CVE-2025-38480

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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": 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"cpe:2.3:o:linux:linux_kernel:6.16:rc6:*:*:*:*:*:*", "matchCriteriaId": "3827F0D4-5FEE-4181-B267-5A45E7CA11FC", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: comedi: Se corrige el uso de datos no inicializados en insn_rw_emulate_bits(). Para las instrucciones `INSN_READ` e `INSN_WRITE` de Comedi en subdispositivos \"digitales\" (tipos de subdispositivo `COMEDI_SUBD_DI`, `COMEDI_SUBD_DO` y `COMEDI_SUBD_DIO`), es com\u00fan que el controlador del subdispositivo no tenga las funciones de controlador `insn_read` e `insn_write`, sino una funci\u00f3n de controlador `insn_bits` para manejar las instrucciones `INSN_BITS` de Comedi. En ese caso, los punteros del controlador de funci\u00f3n `insn_read` y/o `insn_write` del subdispositivo se configuran para apuntar a la funci\u00f3n `insn_rw_emulate_bits()` mediante `__comedi_device_postconfig()`. Para `INSN_WRITE`, `insn_rw_emulate_bits()` actualmente asume que el valor `data[0]` proporcionado es una copia v\u00e1lida de la memoria del usuario. Al menos existir\u00e1 porque `do_insnlist_ioctl()` y `do_insn_ioctl()` en \"comedi_fops.c\" garantizan la asignaci\u00f3n de al menos `MIN_SAMPLES` (16) elementos. Sin embargo, si `insn->n` es 0 (lo cual es permitido para las instrucciones `INSN_READ` e `INSN_WRITE`, entonces `data[0]` puede contener datos no inicializados, y ciertamente contiene datos no v\u00e1lidos, posiblemente de una instrucci\u00f3n diferente en la matriz de instrucciones manejadas por `do_insnlist_ioctl()`. Esto dar\u00e1 como resultado que se escriba un valor incorrecto en el canal de salida digital (o en el canal de entrada/salida digital si se configura como una salida), y puede reflejarse en el estado guardado interno del canal. Arr\u00e9glelo devolviendo 0 temprano si `insn->n` es 0, antes de llegar al c\u00f3digo que accede a `data[0]`. Anteriormente, la funci\u00f3n siempre devolv\u00eda 1 en caso de \u00e9xito, pero se supone que es el n\u00famero de muestras de datos realmente le\u00eddas o escritas hasta `insn->n`, que es 0 en este caso."}], "id": "CVE-2025-38480", "lastModified": "2026-06-17T09:16:56.910", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-07-28T12:15:29.853", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/10f9024a8c824a41827fff1fefefb314c98e2c88"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/16256d7efcf7acc9f39abe21522c4c6b77f67c00"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2af1e7d389c2619219171d23f5b96dbcbb7f9656"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3050d197d6bc9ef128944a70210f42d2430b3000"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3ab55ffaaf75d0c7b68e332c1cdcc1b0e0044870"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c2981bf30401adfcdbfece4ab6f411f7c5875a1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c53570e62b5b28bdb56bb563190227f8307817a5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e9cb26291d009243a4478a7ffb37b3a9175bfce9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-908"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: comedi: Fix use of uninitialized data in insn_rw_emulate_bits()", "id": "2383923", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2383923"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-38480", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-07-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38480\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38480\nhttps://lore.kernel.org/linux-cve-announce/2025072814-CVE-2025-38480-d8ab@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-29T07:59:21.262499+00:00", "updated": "2025-07-29T07:59:21.262592+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}