280 lines
14 KiB
JSON
280 lines
14 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-2024-49855",
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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": "2024-10-21T12:18:47.391Z",
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"dateUpdated": "2026-08-05T11:40:05.597Z"
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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": "2026-08-05T11:40:05.597Z"
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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\nnbd: fix race between timeout and normal completion\n\nIf request timetout is handled by nbd_requeue_cmd(), normal completion\nhas to be stopped for avoiding to complete this requeued request, other\nuse-after-free can be triggered.\n\nFix the race by clearing NBD_CMD_INFLIGHT in nbd_requeue_cmd(), meantime\nmake sure that cmd->lock is grabbed for clearing the flag and the\nrequeue."
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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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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:N - The race is driven by the NBD reply stream received over TCP in `recv_work()`/`nbd_handle_reply()`, code that processes data from a remote peer; a malicious or compromised NBD server — or an on-path attacker, since the NBD protocol is plaintext and unauthenticated on port 10809 — controls reply timing and content.\nAC:L - The remote server controls both sides of the race: it withholds a reply to force `nbd_xmit_timeout()` to fire, then delivers the reply at that instant to collide with `nbd_requeue_cmd()`, and it can repeat this across many in-flight requests indefinitely at no cost.\nPR:N - The NBD protocol carries no authentication, so the attacking server or MITM needs no credentials or privileges on the victim host; the CAP_SYS_ADMIN gate only covers the victim admin's own legitimate `nbd-client` setup, which is a pre-existing deployment condition rather than an attacker privilege.\nUI:N - No victim action is needed at attack time — an already-established NBD session (diskless boot, cloud block storage) is enough, and a compromised server or on-path attacker triggers the race unilaterally.\nS:U - The use-after-free and block-layer corruption stay within the kernel of the affected host; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Re-dispatching an already-completed request makes `nbd_send_cmd()` walk freed bio/bvec memory and transmit its contents over the socket to the attacker-controlled server, directly disclosing freed kernel/page-cache data.\nI:H - A re-dispatched READ writes the server's attacker-chosen reply payload into freed and possibly reallocated pages, and the requeue of a reused request corrupts `q->requeue_list`/`rq->queuelist` — a controlled write primitive usable for control-flow hijacking.\nA:H - The double completion and requeue of a freed/reused request reliably produce list corruption, KASAN use-after-free splats, oops, or hang of the storage path and the machine."
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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/nbd.c"
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],
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"versions": [
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{
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"version": "2895f1831e911ca87d4efdf43e35eb72a0c7e66e",
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"lessThan": "9c25faf72d780a9c71081710cd48759d61ff6e9b",
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"status": "affected",
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"versionType": "git"
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},
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"version": "2895f1831e911ca87d4efdf43e35eb72a0c7e66e",
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"lessThan": "6e73b946a379a1dfbb62626af93843bdfb53753d",
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"status": "affected",
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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": "cdf62c535a9bfd5ff0eef4b91669da39d8abc0c3",
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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": "5171ef20bae852ff38f4cfdb368bcdcc744776d0",
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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": "5.17.15",
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"lessThan": "5.18",
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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": "5.18.4",
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"lessThan": "5.19",
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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": "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/nbd.c"
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],
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"versions": [
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{
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"version": "5.19",
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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": "5.19",
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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": "6.1.113",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.54",
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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": "6.10.13",
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"lessThanOrEqual": "6.10.*",
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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": "6.11.2",
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"lessThanOrEqual": "6.11.*",
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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": "6.12",
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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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"operator": "OR",
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"url": "https://git.kernel.org/stable/c/9c25faf72d780a9c71081710cd48759d61ff6e9b"
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"url": "https://git.kernel.org/stable/c/5236ada8ebbd9e7461f17477357582f5be4f46f7"
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"url": "https://git.kernel.org/stable/c/9a74c3e6c0d686c26ba2aab66d15ddb89dc139cc"
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{
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"url": "https://git.kernel.org/stable/c/c9ea57c91f03bcad415e1a20113bdb2077bcf990"
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}
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],
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"title": "nbd: fix race between timeout and normal completion",
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"x_generator": {
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"engine": "bippy-1.2.0"
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{
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"metrics": [
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{
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"type": "ssvc",
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"content": {
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"id": "CVE-2024-49855",
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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": "2024-10-21T12:56:24.992815Z"
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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": "2024-10-21T13:04:11.227Z"
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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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"dateUpdated": "2025-11-03T22:22:24.136Z"
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} |