268 lines
14 KiB
JSON
268 lines
14 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-2026-68391",
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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": "2026-07-30T09:28:09.388Z",
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"datePublished": "2026-08-10T12:04:10.564Z",
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"dateUpdated": "2026-10-19T21:09:07.828Z"
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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": "2026-10-03T10:55:46.244Z"
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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\nBluetooth: mgmt: hold reference for hci_conn in mgmt_pending_cmds\n\nDereferencing RCU-protected pointers outside critical sections is\ninvalid and may lead to UAF. Use of hci_conn in hci_sync callbacks also\nneeds to hold refcount to avoid UAF.\n\nTake appropriate locks for hci_conn lookups, and take refcount for\nhci_conn pointers stored in mgmt_pending_cmd so that the pointer stays\nvalid.\n\nWhen accessing conn->state, ensure hdev->lock is held to avoid data\nrace."
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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 - Both sides of the race are local: the vulnerable path is entered only by writing MGMT_OP_GET_CONN_INFO/MGMT_OP_GET_CLOCK_INFO to an AF_BLUETOOTH/BTPROTO_HCI socket bound to HCI_CHANNEL_CONTROL, and the free is driven by a local disconnect/device-teardown. A remote or adjacent Bluetooth peer cannot inject mgmt commands, so the vector is local even though the subsystem is Bluetooth.\nAC:L - The attacker owns both sides of the race: one thread loops GET_CONN_INFO/GET_CLOCK_INFO, whose sync callback blocks in __hci_cmd_sync waiting on the controller for up to HCI_CMD_TIMEOUT, while another issues MGMT_OP_DISCONNECT or HCIDEVDOWN to free the hci_conn inside that wide window; with an emulated controller the response timing is fully controlled, and the sequence can be retried indefinitely.\nPR:L - The opcodes lack HCI_MGMT_UNTRUSTED so they need a trusted mgmt socket (CAP_NET_ADMIN), which kernel CNA practice for the Bluetooth mgmt interface treats as low privilege: it is a delegable capability held by the non-root bluetoothd service account and Android's sandboxed Bluetooth process rather than full init-namespace root.\nUI:N - The attacker performs every step itself — queueing the mgmt command and tearing down the connection or the HCI index — with no victim action, pairing, or user-initiated Bluetooth operation required.\nS:U - The use-after-free and the resulting heap corruption stay entirely within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - get_conn_info_complete()/get_clock_info_complete() read rssi, tx_power, max_tx_power, clock and clock_accuracy from a freed hci_conn and return them to userspace over the mgmt socket; hci_conn comes from a general-purpose kmalloc cache, so grooming the reclaimed slab turns this into a repeatable kernel-memory disclosure oracle.\nI:H - The dangling cmd->user_data points at a freed, sprayable struct-device-embedded object that can be reclaimed with attacker-shaped data and is later put/released, and the unlocked lookup also propagates a stale conn->handle into hci_read_rssi_sync/hci_read_clock_sync so the host acts on a handle that may have been reused by another link — sufficient for controlled corruption after heap grooming.\nA:H - Dereferencing the freed hci_conn in the hci_cmd_sync completion callback is a slab use-after-free that produces a KASAN splat and can oops or panic the kernel when the slab has been returned to the page allocator, and it can be re-triggered in a loop for sustained denial of service."
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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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"net/bluetooth/mgmt.c"
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],
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"versions": [
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{
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"version": "7b445e220db9a2c58be5d09bbbd322abf1b1452a",
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"lessThan": "84674dd1d3192ecb050827d3148642609c0c9dbb",
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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": "7b445e220db9a2c58be5d09bbbd322abf1b1452a",
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"lessThan": "b56f2ecafc08f372bf0529f9c4f3f429cb1702dc",
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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": "7b445e220db9a2c58be5d09bbbd322abf1b1452a",
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"lessThan": "f915e74b6f18293d1d69a2a3305ef321ff7c0172",
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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": "7b445e220db9a2c58be5d09bbbd322abf1b1452a",
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"lessThan": "d5b3b484b62bb0f4542e7622789d28871626cdf0",
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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": "7b445e220db9a2c58be5d09bbbd322abf1b1452a",
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"lessThan": "ecdcb55ea1c01dda074406f38058785a69526734",
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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": "7b445e220db9a2c58be5d09bbbd322abf1b1452a",
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"lessThan": "da55f570191d5d72f10c607a7043b947eb05ea46",
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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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"net/bluetooth/mgmt.c"
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],
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"versions": [
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{
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"version": "6.0",
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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": "6.0",
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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": "6.1.189",
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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": "6.6.148",
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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": "6.12.101",
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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": "6.18.42",
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"lessThanOrEqual": "6.18.*",
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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": "7.1.6",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.0",
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"versionEndExcluding": "6.1.189"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.0",
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"versionEndExcluding": "6.6.148"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.0",
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"versionEndExcluding": "6.12.101"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.0",
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"versionEndExcluding": "6.18.42"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.0",
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"versionEndExcluding": "7.1.6"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.0",
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"versionEndExcluding": "7.2"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/84674dd1d3192ecb050827d3148642609c0c9dbb"
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},
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{
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"url": "https://git.kernel.org/stable/c/b56f2ecafc08f372bf0529f9c4f3f429cb1702dc"
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},
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{
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"url": "https://git.kernel.org/stable/c/f915e74b6f18293d1d69a2a3305ef321ff7c0172"
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},
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{
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"url": "https://git.kernel.org/stable/c/d5b3b484b62bb0f4542e7622789d28871626cdf0"
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},
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{
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"url": "https://git.kernel.org/stable/c/ecdcb55ea1c01dda074406f38058785a69526734"
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},
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{
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"url": "https://git.kernel.org/stable/c/da55f570191d5d72f10c607a7043b947eb05ea46"
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}
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],
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"title": "Bluetooth: mgmt: hold reference for hci_conn in mgmt_pending_cmds",
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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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"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-2026-68391",
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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": "2026-10-16T15:47:56.283760Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-416",
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"description": "CWE-416 Use After Free"
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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": "2026-10-19T21:09:07.828Z"
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}
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}
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]
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}
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} |