200 lines
9.7 KiB
JSON
200 lines
9.7 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-2022-49531",
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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": "2025-02-26T02:08:31.588Z",
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"datePublished": "2025-02-26T02:13:51.542Z",
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"dateUpdated": "2026-08-05T08:55:27.919Z"
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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": "2026-08-05T08:55:27.919Z"
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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\nloop: implement ->free_disk\n\nEnsure that the lo_device which is stored in the gendisk private\ndata is valid until the gendisk is freed. Currently the loop driver\nuses a lot of effort to make sure a device is not freed when it is\nstill in use, but to to fix a potential deadlock this will be relaxed\na bit soon."
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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 bug is reached only through local loop device lifecycle control—LOOP_CTL_REMOVE on /dev/loop-control racing with opens of /dev/loopN—not via network packet processing or adjacent-link protocols.\nAC:L - The attacker drives both sides of the open-vs-remove race (concurrent open of /dev/loopN while issuing LOOP_CTL_REMOVE after Lo_deleting is set but before/during del_gendisk and kfree(lo)), so success does not depend on conditions outside attacker control.\nPR:L - loop_control_ioctl has no capable() check; /dev/loop-control is mode 660 root:disk, so disk-group users and containers granted loop device access can add/remove devices without init-namespace CAP_SYS_ADMIN (same PR:L treatment as CVE-2023-53111).\nUI:N - The attacker performs LOOP_CTL_REMOVE and the concurrent open/teardown themselves; no separate victim action such as mounting a filesystem is required.\nS:U - Impact is a standard in-kernel use-after-free of loop_device within the host kernel’s security authority, with no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:H - kfree(lo) while gendisk->private_data still refers to the freed loop_device is a slab UAF; reclaiming that object enables arbitrary kernel read/disclosure primitives.\nI:H - The same loop_device UAF can be heap-sprayed into write and control-flow hijack primitives (e.g., via lo_open/lo_release/ioctl paths touching the dangling private_data), enabling integrity compromise and privilege escalation.\nA:H - Dereferencing the freed loop_device (mutex_lock on destroyed lo_mutex, I/O via queuedata, etc.) reliably causes kernel oops/panic even when not fully exploited."
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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/block/loop.c"
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],
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"versions": [
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{
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"version": "73285082745045bcd64333c1fbaa88f8490f2626",
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"lessThan": "aadd1443aae7fe8956e3b11157827067f034406a",
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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": "73285082745045bcd64333c1fbaa88f8490f2626",
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"lessThan": "d2c7f56f8b5256d57f9e3fc7794c31361d43bdd9",
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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/block/loop.c"
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],
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"versions": [
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{
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"version": "2.6.22",
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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": "2.6.22",
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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": "5.18.3",
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"lessThanOrEqual": "5.18.*",
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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": "5.19",
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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": "2.6.22",
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"versionEndExcluding": "5.18.3"
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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": "2.6.22",
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"versionEndExcluding": "5.19"
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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/aadd1443aae7fe8956e3b11157827067f034406a"
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},
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{
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"url": "https://git.kernel.org/stable/c/d2c7f56f8b5256d57f9e3fc7794c31361d43bdd9"
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}
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],
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"title": "loop: implement ->free_disk",
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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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"cvssV3_1": {
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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 5.5,
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"attackVector": "LOCAL",
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"baseSeverity": "MEDIUM",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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"integrityImpact": "NONE",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "NONE"
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}
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},
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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-2022-49531",
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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": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2025-10-01T19:37:55.551083Z"
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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-667",
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"description": "CWE-667 Improper Locking"
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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": "2025-10-01T19:46:41.143Z"
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}
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}
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]
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}
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} |