193 lines
11 KiB
JSON
193 lines
11 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-2024-42235",
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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": "2024-07-30T07:40:12.252Z",
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"datePublished": "2024-08-07T15:14:25.070Z",
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"dateUpdated": "2026-08-05T11:36:00.433Z"
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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": "2026-08-05T11:36:00.433Z"
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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\ns390/mm: Add NULL pointer check to crst_table_free() base_crst_free()\n\ncrst_table_free() used to work with NULL pointers before the conversion\nto ptdescs. Since crst_table_free() can be called with a NULL pointer\n(error handling in crst_table_upgrade() add an explicit check.\n\nAlso add the same check to base_crst_free() for consistency reasons.\n\nIn real life this should not happen, since order two GFP_KERNEL\nallocations will not fail, unless FAIL_PAGE_ALLOC is enabled and used."
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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 vulnerable path is entered only through a local `mmap()`/`mremap()`/`shmat()` syscall on s390, via `arch_get_unmapped_area()` → `check_asce_limit()` → `crst_table_upgrade()`. No network, adjacent-network, or remote-peer data reaches this code.\nAC:L - The attacker fully controls the address-space geometry needed (two ordinary high-address mmaps drive `asce_limit` to `_REGION1_SIZE` and then request a 5-level upgrade, leaving `p4d == NULL`), and can engineer the required order-2 `GFP_KERNEL` failure by driving their own multithreaded process into the OOM-victim state that makes `__alloc_pages_slowpath()` return NULL, retrying as often as needed. Every attempt is cheap and repeatable, so the remaining timing window is one the attacker creates rather than one beyond their control.\nPR:L - Any unprivileged local user can call `mmap()` with a high address hint — there is no capability check, namespace requirement, or privileged device node anywhere between the syscall entry and `crst_table_free()`. On IBM Z / LinuxONE hosts this means any shared-tenant, container, or shell user.\nUI:N - The whole sequence is performed by the attacking process itself through ordinary syscalls; no victim must mount a filesystem, open a device, or take any other action.\nS:U - The corrupted page-allocator state and the freed reserved page remain entirely within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - On 6.6.y the reserved PFN 0 (the s390 absolute-zero lowcore holding restart PSWs and `restart_fn`/`restart_data` kernel pointers plus machine-check save areas) is released into the buddy allocator with the sanity checks compiled out, so it can be handed to an attacker-influenced allocation still containing that firmware/kernel state; repeating the trigger underflows the refcount of whatever page then occupies PFN 0, yielding a use-after-free read primitive over live kernel memory.\nI:H - Injecting a memblock-reserved page into the buddy free lists breaks the allocator's ownership invariant — the page is concurrently written by hardware/firmware (store status, machine-check save area) while owned by another kernel object or user mapping — and the refcount underflow on repeat triggers gives a double-free/page-reuse primitive, the classic route to controlled kernel writes.\nA:H - On 6.9/6.10 the underflowed `__pa(0)` produces a wild `struct page *` that faults in `compound_order()`, oopsing the kernel; on 6.6.y with page-checking enabled it produces a \"BUG: Bad page state\" splat and `TAINT_BAD_PAGE` (a panic under `panic_on_taint`), and with checks off the corrupted allocator state leads to subsequent oops/panic."
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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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"arch/s390/mm/pgalloc.c"
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],
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"versions": [
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{
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"version": "6326c26c1514757242829b292b26eac589013200",
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"lessThan": "794fa52b94637d6b2e8c9474fbe3983af5c9f046",
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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": "6326c26c1514757242829b292b26eac589013200",
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"lessThan": "f80bd8bb6f380bc265834c46058d38b34174813e",
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"status": "affected",
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"versionType": "git"
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{
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"lessThan": "b5efb63acf7bddaf20eacfcac654c25c446eabe8",
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"status": "affected",
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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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"arch/s390/mm/pgalloc.c"
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],
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"versions": [
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{
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"version": "6.6",
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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": "6.6",
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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": "6.6.41",
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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": "6.9.10",
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"lessThanOrEqual": "6.9.*",
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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": "6.10",
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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": "6.6",
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"versionEndExcluding": "6.6.41"
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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": "6.6",
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"versionEndExcluding": "6.9.10"
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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": "6.6",
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"versionEndExcluding": "6.10"
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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/794fa52b94637d6b2e8c9474fbe3983af5c9f046"
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},
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{
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"url": "https://git.kernel.org/stable/c/f80bd8bb6f380bc265834c46058d38b34174813e"
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},
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{
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"url": "https://git.kernel.org/stable/c/b5efb63acf7bddaf20eacfcac654c25c446eabe8"
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}
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],
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"title": "s390/mm: Add NULL pointer check to crst_table_free() base_crst_free()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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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-2024-42235",
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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": "2024-09-10T16:14:07.518719Z"
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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": "2024-09-11T17:34:32.266Z"
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}
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}
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]
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}
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} |