275 lines
14 KiB
JSON
275 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-2026-23461",
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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": "2026-01-13T15:37:46.021Z",
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"datePublished": "2026-04-03T15:15:41.051Z",
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"dateUpdated": "2026-10-19T18:35:45.372Z"
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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": "2026-08-05T12:21:59.477Z"
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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: L2CAP: Fix use-after-free in l2cap_unregister_user\n\nAfter commit ab4eedb790ca (\"Bluetooth: L2CAP: Fix corrupted list in\nhci_chan_del\"), l2cap_conn_del() uses conn->lock to protect access to\nconn->users. However, l2cap_register_user() and l2cap_unregister_user()\ndon't use conn->lock, creating a race condition where these functions can\naccess conn->users and conn->hchan concurrently with l2cap_conn_del().\n\nThis can lead to use-after-free and list corruption bugs, as reported\nby syzbot.\n\nFix this by changing l2cap_register_user() and l2cap_unregister_user()\nto use conn->lock instead of hci_dev_lock(), ensuring consistent locking\nfor the l2cap_conn structure."
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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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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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:A - The vulnerable L2CAP/HIDP teardown path is reachable through Bluetooth ACL/L2CAP connection handling by a nearby Bluetooth peer. Bluetooth proximity is an adjacent-network attack surface rather than internet-routable network access.\nAC:L - This is a locking/race use-after-free where the attacker can repeatedly drive HIDP/L2CAP connection teardown and unregister paths through connection close/disconnect behavior. The race is not dependent on a rare configuration or a condition outside attacker influence.\nPR:N - Although the local HIDP management ioctl path is gated by init-namespace CAP_NET_ADMIN, an adjacent malicious Bluetooth HID peer can trigger teardown of an already established HIDP/L2CAP session without privileges on the victim system. Under the higher-severity reasonable Bluetooth-peer scenario, no victim-system privileges are required.\nUI:N - Once the HIDP/L2CAP session exists, triggering the vulnerable unregister/connection-delete race does not require a victim user to perform an action. The peer can cause disconnect/teardown behavior directly.\nS:U - The vulnerability corrupts kernel Bluetooth/L2CAP state within the same kernel security authority. It is not a VM escape, IOMMU bypass, or other scope-changing boundary crossing.\nC:H - The flaw is a kernel use-after-free/list corruption condition involving L2CAP connection/user objects and potentially freed HCI device memory. Kernel UAFs are defensibly treated as enabling high confidentiality impact through memory disclosure primitives.\nI:H - The same UAF/list corruption can be leveraged beyond a crash for heap manipulation and control-flow or data-structure corruption. Kernel memory corruption is therefore high integrity impact.\nA:H - Syzbot reports show KASAN use-after-free crashes in l2cap_unregister_user, and the bug can corrupt lists during connection teardown. A kernel crash/oops is high availability impact."
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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/l2cap_core.c"
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],
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"versions": [
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{
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"version": "efc30877bd4bc85fefe98d80af60fafc86e5775e",
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"lessThan": "11a87dd5df428a4b79a84d2790cac7f3c73f1f0d",
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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": "f87271d21dd4ee83857ca11b94e7b4952749bbae",
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"lessThan": "c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf",
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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": "ab4eedb790cae44313759b50fe47da285e2519d5",
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"status": "affected",
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},
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{
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"version": "ab4eedb790cae44313759b50fe47da285e2519d5",
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"lessThan": "752a6c9596dd25efd6978a73ff21f3b592668f4a",
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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": "18ab6b6078fa8191ca30a3065d57bf35d5635761",
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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": "6.6.84",
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"lessThan": "6.6.130",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.12.20",
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"lessThan": "6.12.78",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.13.8",
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"lessThan": "6.14",
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"status": "affected",
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"versionType": "semver"
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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/l2cap_core.c"
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],
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"versions": [
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{
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"version": "6.14",
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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": "6.14",
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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": "6.6.130",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.12.78",
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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": "6.18.20",
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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": "6.19.10",
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"lessThanOrEqual": "6.19.*",
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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": "7.0",
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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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{
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"operator": "OR",
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"negate": false,
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"versionStartIncluding": "6.6.84",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/11a87dd5df428a4b79a84d2790cac7f3c73f1f0d"
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},
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{
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"url": "https://git.kernel.org/stable/c/c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf"
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"url": "https://git.kernel.org/stable/c/da3000cbe4851458a22be38bb18c0689c39fdd5f"
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"url": "https://git.kernel.org/stable/c/71030f3b3015a412133a805ff47970cdcf30c2b8"
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{
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"url": "https://git.kernel.org/stable/c/752a6c9596dd25efd6978a73ff21f3b592668f4a"
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}
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],
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"title": "Bluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user",
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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-2026-23461",
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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": "2026-10-16T15:08:32.316331Z"
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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-362",
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"description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"
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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": "2026-10-19T18:35:45.372Z"
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}
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}
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]
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}
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} |