233 lines
12 KiB
JSON
233 lines
12 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-2024-49854",
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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": "2024-10-21T12:17:06.016Z",
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"datePublished": "2024-10-21T12:18:46.723Z",
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"dateUpdated": "2026-08-05T11:40:04.538Z"
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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": "2026-08-05T11:40:04.538Z"
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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\nblock, bfq: fix uaf for accessing waker_bfqq after splitting\n\nAfter commit 42c306ed7233 (\"block, bfq: don't break merge chain in\nbfq_split_bfqq()\"), if the current procress is the last holder of bfqq,\nthe bfqq can be freed after bfq_split_bfqq(). Hence recored the bfqq and\nthen access bfqq->waker_bfqq may trigger UAF. What's more, the waker_bfqq\nmay in the merge chain of bfqq, hence just recored waker_bfqq is still\nnot safe.\n\nFix the problem by adding a helper bfq_waker_bfqq() to check if\nbfqq->waker_bfqq is in the merge chain, and current procress is the only\nholder."
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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 code is the BFQ I/O scheduler in the block layer, reached only by submitting I/O locally (read/write/ioctl on a file or block device backed by a bfq-scheduled queue). No network or physical vector exists.\nAC:L - The attacker fully controls both the queue-merge topology and the split trigger by spawning cooperating processes doing interleaved then seeky I/O; this is not a race requiring uncontrolled timing, and syzkaller reproduced the identical UAF with a generic fsstress workload on a default distro-common BFQ configuration.\nPR:L - Any unprivileged local user able to issue ordinary filesystem I/O can reach bfq_init_rq(); no capabilities, root, or namespace tricks are needed.\nUI:N - The attacker's own processes create the merged/waker queue state and trigger the split; no victim action or interaction is required.\nS:U - The corruption is confined to kernel heap objects within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The bug reads a pointer out of a freed bfq_queue slab object, and that value is then dereferenced and propagated; with the freed slot refilled by attacker-created bfq_queues this becomes a controlled kernel-memory read primitive and kernel pointer disclosure.\nI:H - hlist_add_head() writes list pointers into the freed/attacker-influenced waker_bfqq object, and leaves a live queue linked into a dead object's woken_list that is traversed later — a write-what-where style primitive leveragable for privilege escalation.\nA:H - The use-after-free reliably produces slab corruption and a kernel oops/panic, as demonstrated by the KASAN slab-use-after-free report from the same code path."
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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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"block/bfq-iosched.c"
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],
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"versions": [
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{
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"version": "e0c20d88b7dce85d2703bb6ba77bf359959675cd",
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"lessThan": "63a07379fdb6c72450cb05294461c6016b8b7726",
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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": "de6c5e3a456019d2182e345730e59721714fa0b5",
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"lessThan": "de0456460f2abf921e356ed2bd8da87a376680bd",
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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": "19f3bec2ac4be329b9bd12b18a989b867618d2d8",
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"lessThan": "0780451f03bf518bc032a7c584de8f92e2d39d7f",
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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": "13b3d0e8cb121f99b11918a0d4bcc1ce4647d352",
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"lessThan": "0b8bda0ff17156cd3f60944527c9d8c9f99f1583",
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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": "4780f50ea50cfe8e89fc3747bf3dd155488433bb",
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"lessThan": "cae58d19121a70329cf971359e2518c93fec04fe",
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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": "42c306ed723321af4003b2a41bb73728cab54f85",
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"lessThan": "1ba0403ac6447f2d63914fb760c44a3b19c44eaf",
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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": "9e813033594b141f61ff0ef0cfaaef292564b041",
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"status": "affected",
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},
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{
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"version": "3a5f45a4ad4e1fd36b0a998eef03d76a4f02a2a8",
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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": "3630a18846c7853aa326d3b42fd0a855af7b41bc",
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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": "4.19.323",
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"lessThan": "4.20",
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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": "5.4.285",
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"lessThan": "5.5",
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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": "5.10.227",
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"lessThan": "5.11",
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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": "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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"block/bfq-iosched.c"
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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": "4.19.323"
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},
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{
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"vulnerable": true,
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/63a07379fdb6c72450cb05294461c6016b8b7726"
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},
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{
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"url": "https://git.kernel.org/stable/c/de0456460f2abf921e356ed2bd8da87a376680bd"
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},
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{
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"url": "https://git.kernel.org/stable/c/0780451f03bf518bc032a7c584de8f92e2d39d7f"
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},
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{
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"url": "https://git.kernel.org/stable/c/0b8bda0ff17156cd3f60944527c9d8c9f99f1583"
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},
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{
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"url": "https://git.kernel.org/stable/c/cae58d19121a70329cf971359e2518c93fec04fe"
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},
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{
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"url": "https://git.kernel.org/stable/c/1ba0403ac6447f2d63914fb760c44a3b19c44eaf"
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}
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],
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"title": "block, bfq: fix uaf for accessing waker_bfqq after splitting",
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"x_generator": {
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"engine": "bippy-1.2.0"
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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-2024-49854",
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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": "2024-10-21T12:56:32.405058Z"
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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": "2024-10-21T13:04:11.371Z"
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}
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},
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
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}
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],
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"shortName": "CVE",
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"dateUpdated": "2025-11-03T22:22:22.684Z"
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}
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}
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]
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}
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} |