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-2025-39879",
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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": "2025-04-16T07:20:57.144Z",
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"datePublished": "2025-09-23T06:00:49.377Z",
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"dateUpdated": "2026-10-21T12:37:32.477Z"
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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": "2026-10-21T12:37:32.477Z"
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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\nceph: always call ceph_shift_unused_folios_left()\n\nThe function ceph_process_folio_batch() sets folio_batch entries to\nNULL, which is an illegal state. Before folio_batch_release() crashes\ndue to this API violation, the function ceph_shift_unused_folios_left()\nis supposed to remove those NULLs from the array.\n\nHowever, since commit ce80b76dd327 (\"ceph: introduce\nceph_process_folio_batch() method\"), this shifting doesn't happen\nanymore because the \"for\" loop got moved to ceph_process_folio_batch(),\nand now the `i` variable that remains in ceph_writepages_start()\ndoesn't get incremented anymore, making the shifting effectively\nunreachable much of the time.\n\nLater, commit 1551ec61dc55 (\"ceph: introduce ceph_submit_write()\nmethod\") added more preconditions for doing the shift, replacing the\n`i` check (with something that is still just as broken):\n\n- if ceph_process_folio_batch() fails, shifting never happens\n\n- if ceph_move_dirty_page_in_page_array() was never called (because\n ceph_process_folio_batch() has returned early for some of various\n reasons), shifting never happens\n\n- if `processed_in_fbatch` is zero (because ceph_process_folio_batch()\n has returned early for some of the reasons mentioned above or\n because ceph_move_dirty_page_in_page_array() has failed), shifting\n never happens\n\nSince those two commits, any problem in ceph_process_folio_batch()\ncould crash the kernel, e.g. this way:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000034\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n PGD 0 P4D 0\n Oops: Oops: 0002 [#1] SMP NOPTI\n CPU: 172 UID: 0 PID: 2342707 Comm: kworker/u778:8 Not tainted 6.15.10-cm4all1-es #714 NONE\n Hardware name: Dell Inc. PowerEdge R7615/0G9DHV, BIOS 1.6.10 12/08/2023\n Workqueue: writeback wb_workfn (flush-ceph-1)\n RIP: 0010:folios_put_refs+0x85/0x140\n Code: 83 c5 01 39 e8 7e 76 48 63 c5 49 8b 5c c4 08 b8 01 00 00 00 4d 85 ed 74 05 41 8b 44 ad 00 48 8b 15 b0 >\n RSP: 0018:ffffb880af8db778 EFLAGS: 00010207\n RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000003\n RDX: ffffe377cc3b0000 RSI: 0000000000000000 RDI: ffffb880af8db8c0\n RBP: 0000000000000000 R08: 000000000000007d R09: 000000000102b86f\n R10: 0000000000000001 R11: 00000000000000ac R12: ffffb880af8db8c0\n R13: 0000000000000000 R14: 0000000000000000 R15: ffff9bd262c97000\n FS: 0000000000000000(0000) GS:ffff9c8efc303000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000034 CR3: 0000000160958004 CR4: 0000000000770ef0\n PKRU: 55555554\n Call Trace:\n <TASK>\n ceph_writepages_start+0xeb9/0x1410\n\nThe crash can be reproduced easily by changing the\nceph_check_page_before_write() return value to `-E2BIG`.\n\n(Interestingly, the crash happens only if `huge_zero_folio` has\nalready been allocated; without `huge_zero_folio`,\nis_huge_zero_folio(NULL) returns true and folios_put_refs() skips NULL\nentries instead of dereferencing them. That makes reproducing the bug\nsomewhat unreliable. See\nhttps://lore.kernel.org/20250826231626.218675-1-max.kellermann@ionos.com\nfor a discussion of this detail.)\n\nMy suggestion is to move the ceph_shift_unused_folios_left() to right\nafter ceph_process_folio_batch() to ensure it always gets called to\nfix up the illegal folio_batch state."
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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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"fs/ceph/addr.c"
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],
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"versions": [
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{
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"version": "0f2b2b7cacf888229cec19126e6791b11fb35f32",
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"lessThan": "523214f0afa1b3d0e696917bc5a4d0737718e3d7",
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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": "ce80b76dd32764cc914975777e058d4fae4f0ea0",
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"lessThan": "289b6615cf553d98509a9b273195d9936da1cfb2",
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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": "ce80b76dd32764cc914975777e058d4fae4f0ea0",
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"lessThan": "cce7c15faaac79b532a07ed6ab8332280ad83762",
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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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"fs/ceph/addr.c"
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],
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"versions": [
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{
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"version": "6.15",
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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": "6.15",
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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": "6.16.8",
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"lessThanOrEqual": "6.16.*",
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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": "6.17",
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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": "6.15",
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"versionEndExcluding": "6.16.8"
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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": "6.15",
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"versionEndExcluding": "6.17"
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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/523214f0afa1b3d0e696917bc5a4d0737718e3d7"
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},
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{
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"url": "https://git.kernel.org/stable/c/289b6615cf553d98509a9b273195d9936da1cfb2"
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},
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{
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"url": "https://git.kernel.org/stable/c/cce7c15faaac79b532a07ed6ab8332280ad83762"
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}
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],
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"title": "ceph: always call ceph_shift_unused_folios_left()",
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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-2025-39879",
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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": "2026-01-14T19:25:25.258616Z"
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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-476",
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"description": "CWE-476 NULL Pointer Dereference"
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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": "2026-01-14T19:33:12.440Z"
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}
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}
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]
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}
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} |