218 lines
11 KiB
JSON
218 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-2021-47412",
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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": "2024-05-21T14:58:30.817Z",
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"datePublished": "2024-05-21T15:04:03.309Z",
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"dateUpdated": "2026-08-05T08:47:43.235Z"
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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": "2026-08-05T08:47:43.235Z"
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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: don't call rq_qos_ops->done_bio if the bio isn't tracked\n\nrq_qos framework is only applied on request based driver, so:\n\n1) rq_qos_done_bio() needn't to be called for bio based driver\n\n2) rq_qos_done_bio() needn't to be called for bio which isn't tracked,\nsuch as bios ended from error handling code.\n\nEspecially in bio_endio():\n\n1) request queue is referred via bio->bi_bdev->bd_disk->queue, which\nmay be gone since request queue refcount may not be held in above two\ncases\n\n2) q->rq_qos may be freed in blk_cleanup_queue() when calling into\n__rq_qos_done_bio()\n\nFix the potential kernel panic by not calling rq_qos_ops->done_bio if\nthe bio isn't tracked. This way is safe because both ioc_rqos_done_bio()\nand blkcg_iolatency_done_bio() are nop if the bio isn't tracked."
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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 bug is in block-layer bio_endio()/rq_qos_done_bio(), reached by local I/O submission (syscalls to a block device or filesystem on it) racing device/queue teardown, not by parsing remote protocol packets.\nAC:L - An attacker who can issue concurrent I/O and induce queue teardown (e.g. write to removable/loop/NBD media then eject/disconnect) controls both sides of the race; rq_qos_done_bio() has no lock versus rq_qos_exit(), so the UAF is reliably triggerable.\nPR:L - Unprivileged local users can write to user-accessible block devices (removable media, permitted loop/NBD nodes) and trigger teardown via eject/unmount paths available to the mounting user; root in the init namespace is not required.\nUI:N - The attacker performs the I/O and device teardown/eject themselves; no separate victim action is required.\nS:U - Impact is confined to the host kernel (UAF/panic or local privilege escalation) and does not cross a VM, IOMMU, or other security authority boundary.\nC:H - rq_qos_exit() frees rq_qos objects while bio_endio() may still load q->rq_qos and walk rqos->ops/next on reallocated slab memory, giving an attacker-controlled UAF read primitive.\nI:H - __rq_qos_done_bio() invokes rqos->ops->done_bio on the freed object, so heap reuse can hijack the function pointer for arbitrary write / control-flow hijacking, not merely a crash.\nA:H - The same UAF produces kernel oops/panic when done_bio runs against freed rq_qos or a freed request_queue, fully impacting availability."
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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/bio.c"
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],
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"versions": [
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{
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"version": "67b42d0bf7a8fd1ec0cf1acdc9550e688d7c8578",
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"lessThan": "db60edbfff332a6a5477c367af8125f034570989",
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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": "67b42d0bf7a8fd1ec0cf1acdc9550e688d7c8578",
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"lessThan": "004b8f8a691205a93d9e80d98b786b2b97424d6e",
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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": "67b42d0bf7a8fd1ec0cf1acdc9550e688d7c8578",
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"lessThan": "a647a524a46736786c95cdb553a070322ca096e3",
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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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"block/bio.c"
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],
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"versions": [
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{
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"version": "4.19",
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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": "4.19",
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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": "5.10.241",
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"lessThanOrEqual": "5.10.*",
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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": "5.14.11",
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"lessThanOrEqual": "5.14.*",
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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": "5.15",
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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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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.19",
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"versionEndExcluding": "5.10.241"
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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": "4.19",
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"versionEndExcluding": "5.14.11"
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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",
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/db60edbfff332a6a5477c367af8125f034570989"
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},
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{
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"url": "https://git.kernel.org/stable/c/004b8f8a691205a93d9e80d98b786b2b97424d6e"
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},
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{
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"url": "https://git.kernel.org/stable/c/a647a524a46736786c95cdb553a070322ca096e3"
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}
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],
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"title": "block: don't call rq_qos_ops->done_bio if the bio isn't tracked",
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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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"type": "ssvc",
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"content": {
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"timestamp": "2024-06-11T17:28:47.066559Z",
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"id": "CVE-2021-47412",
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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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"role": "CISA Coordinator",
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"version": "2.0.3"
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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": "2024-06-11T17:29:00.823Z"
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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://git.kernel.org/stable/c/004b8f8a691205a93d9e80d98b786b2b97424d6e",
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
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