314 lines
17 KiB
JSON
314 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-38478",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T04:51:24.021Z",
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"datePublished": "2025-07-28T11:21:44.210Z",
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"dateUpdated": "2026-10-15T21:52:17.239Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:02:15.495Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The only entry point is the COMEDI_INSN/COMEDI_INSNLIST ioctl issued on a local /dev/comediN character device (comedi_unlocked_ioctl, comedi_fops.c:2253/2280). No network, remote-peer, or adjacent-network data path reaches this code.\nAC:L - The attacker deterministically triggers the bug with a single ioctl by setting insn->n smaller than what the handler reads (e.g. INSN_CONFIG with an ID that falls through check_insn_config_length()'s permissive default arm) — no race, no timing window, no condition outside attacker control, and the kmalloc-64 slab contents can be groomed beforehand to influence the uninitialized bytes.\nPR:L - Unlike COMEDI_DEVCONFIG, the instruction ioctls carry no capable() check whatsoever — comedi_open() demands CAP_SYS_ADMIN only for an unattached device, and PCI/USB boards auto-attach at probe via comedi_pci_auto_config()/comedi_usb_auto_config(), so any unprivileged user holding an fd on the comedi node (comedi's standard group-permission model) can drive the path.\nUI:N - The attacker performs the entire attack with self-issued ioctls on a file descriptor it opens itself; no victim action, mount, or interaction by another user is required.\nS:U - The uninitialized read and its consequences stay entirely within the kernel's own security authority on the same host, with no crossing of a VM, IOMMU, container, or sandbox boundary.\nC:H - Up to 60 bytes of uninitialized kernel slab memory — potentially containing heap and kernel pointers usable to defeat KASLR — are consumed by subdevice handlers and pushed into device registers that the same unprivileged caller can read back through comedi read/get instructions (s526 preload→counter read, NI routing/filter set→get, 8254 load→read), and this identical buffer was the subject of a confirmed syzbot KMSAN kernel-infoleak.\nI:H - Uninitialized heap words bypass parse_insn()'s maxdata range validation (which only covers the first insn->n elements) and are written directly into counter mode/preload, PWM, routing and edge-detection/interrupt registers plus driver state (devpriv->gpct_config, io_bits, readback caches), so both kernel-side driver state and the hardware controlling the attached physical process are modified with values neither the user nor the driver validated.\nA:H - Programming interrupt/edge-detection and counter-mode registers with random heap contents can leave the board asserting spurious interrupts or wedged in an invalid state — an IRQ storm or livelock on a shared line — and the uninitialized read is itself undefined behaviour that is fatal on KMSAN-instrumented and panic_on_warn hardened kernels."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/comedi/comedi_fops.c"
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],
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"versions": [
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{
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"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
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"lessThan": "6f38c6380c3b38a05032b8881e41137385a6ce02",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
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"lessThan": "13e4d9038a1e869445a996a3f604a84ef52fe8f4",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
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"lessThan": "020eed5681d0f9bced73970368078a92d6cfaa9c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
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"lessThan": "d3436638738ace8f101af7bdee2eae1bc38e9b29",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
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"lessThan": "673ee92bd2d31055bca98a1d96b653f5284289c4",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
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"lessThan": "c42116dc70af6664526f7aa82cf937824ab42649",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
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"lessThan": "fe8713fb4e4e82a4f91910d9a41bf0613e69a0b9",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
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"lessThan": "46d8c744136ce2454aa4c35c138cc06817f92b8e",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/comedi/comedi_fops.c"
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],
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"versions": [
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{
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"version": "2.6.29",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "2.6.29",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.4.297",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.241",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.190",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.147",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.100",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.40",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.15.8",
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"lessThanOrEqual": "6.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.16",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.29",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/6f38c6380c3b38a05032b8881e41137385a6ce02"
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},
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{
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"url": "https://git.kernel.org/stable/c/13e4d9038a1e869445a996a3f604a84ef52fe8f4"
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},
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{
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"url": "https://git.kernel.org/stable/c/020eed5681d0f9bced73970368078a92d6cfaa9c"
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},
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{
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"url": "https://git.kernel.org/stable/c/d3436638738ace8f101af7bdee2eae1bc38e9b29"
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},
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{
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"url": "https://git.kernel.org/stable/c/673ee92bd2d31055bca98a1d96b653f5284289c4"
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},
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{
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"url": "https://git.kernel.org/stable/c/c42116dc70af6664526f7aa82cf937824ab42649"
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},
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{
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"url": "https://git.kernel.org/stable/c/fe8713fb4e4e82a4f91910d9a41bf0613e69a0b9"
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},
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{
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"url": "https://git.kernel.org/stable/c/46d8c744136ce2454aa4c35c138cc06817f92b8e"
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}
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],
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"title": "comedi: Fix initialization of data for instructions that write to subdevice",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
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},
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
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}
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],
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2025-11-03T17:38:46.621Z"
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}
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},
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-38478",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:50:50.290792Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-15T21:52:17.239Z"
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}
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}
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]
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}
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} |