203 lines
10 KiB
JSON
203 lines
10 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-2024-42250",
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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": "2024-07-30T07:40:12.256Z",
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"datePublished": "2024-08-07T15:14:33.997Z",
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"dateUpdated": "2026-08-05T11:36:04.678Z"
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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": "2026-08-05T11:36:04.678Z"
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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\ncachefiles: add missing lock protection when polling\n\nAdd missing lock protection in poll routine when iterating xarray,\notherwise:\n\nEven with RCU read lock held, only the slot of the radix tree is\nensured to be pinned there, while the data structure (e.g. struct\ncachefiles_req) stored in the slot has no such guarantee. The poll\nroutine will iterate the radix tree and dereference cachefiles_req\naccordingly. Thus RCU read lock is not adequate in this case and\nspinlock is needed here."
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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 race is driven through local file I/O on an EROFS-over-fscache on-demand mount and the local `/dev/cachefiles` daemon interface; no network-supplied data reaches the vulnerable poll iterator.\nAC:L - The attacker creates both sides of the race — each cache-miss read allocates a request and calls `wake_up_all(&cache->daemon_pollwq)`, forcing the daemon into the unlocked xarray walk, and the same task performs the `kfree(req)` on completion — and can retry indefinitely while heap-spraying the freed slab.\nPR:L - An unprivileged local user or container tenant only needs read access to files on the already-mounted on-demand cache; the CAP_SYS_ADMIN-held daemon fd is a normal running service in these deployments, not something the attacker must obtain.\nUI:N - No victim action is required — the cachefiles daemon polls continuously as part of its normal operation and is woken automatically by the attacker's own request submissions.\nS:U - The use-after-free occurs in kernel memory and its impact stays within the kernel's security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - `req->object` is at offset 0 of the freed object, so a reallocated/sprayed slab yields an attacker-chosen pointer that is dereferenced twice, and the resulting `state` comparison is leaked back as the EPOLLIN bit — a repeatable arbitrary-address read oracle.\nI:H - A slab use-after-free with a fully attacker-controllable first-field pointer is a classic primitive for heap grooming and control-flow/data corruption, so integrity impact is High per use-after-free handling.\nA:H - Dereferencing the stale or wild `req->object` chain reliably produces a kernel oops/panic, taking down the host or container node."
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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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"fs/cachefiles/daemon.c"
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],
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"versions": [
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{
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"version": "0e19a18f998dcabe8be590e0b39660a1f230209b",
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"lessThan": "97cfd5e20ddc2e33e16ce369626ce76c9a475fd7",
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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": "18943864342705fa18dd4e6b8d608491fec81f6e",
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"lessThan": "6bb6bd3dd6f382dfd36220d4b210a0c77c066651",
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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": "b817e22b2e91257ace32a6768c3c003faeaa1c5c",
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"lessThan": "8eadcab7f3dd809edbe5ae20533ff843dfea3a07",
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"status": "affected",
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{
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"lessThan": "cf5bb09e742a9cf6349127e868329a8f69b7a014",
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"status": "affected",
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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/cachefiles/daemon.c"
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],
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"versions": [
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{
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"version": "6.8",
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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": "6.8",
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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": "6.8",
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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": "6.8",
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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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"references": [
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{
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"url": "https://git.kernel.org/stable/c/97cfd5e20ddc2e33e16ce369626ce76c9a475fd7"
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},
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{
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"url": "https://git.kernel.org/stable/c/6bb6bd3dd6f382dfd36220d4b210a0c77c066651"
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},
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{
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"url": "https://git.kernel.org/stable/c/8eadcab7f3dd809edbe5ae20533ff843dfea3a07"
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},
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{
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"url": "https://git.kernel.org/stable/c/cf5bb09e742a9cf6349127e868329a8f69b7a014"
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}
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],
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"title": "cachefiles: add missing lock protection when polling",
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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-2024-42250",
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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": "2024-09-10T16:13:18.948935Z"
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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": "2024-09-11T17:34:30.655Z"
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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": "2025-11-03T22:02:51.030Z"
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}
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}
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]
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}
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} |