228 lines
12 KiB
JSON
228 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-2025-22074",
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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": "2024-12-29T08:45:45.814Z",
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"datePublished": "2025-04-16T14:12:25.921Z",
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"dateUpdated": "2026-10-30T12:21:13.575Z"
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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": "2026-10-30T12:21:13.575Z"
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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\nksmbd: fix r_count dec/increment mismatch\n\nr_count is only increased when there is an oplock break wait,\nso r_count inc/decrement are not paired. This can cause r_count\nto become negative, which can lead to a problem where the ksmbd\nthread does not terminate."
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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:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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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:N - ksmbd is the in-kernel SMB server listening on TCP/445; the oplock/lease break path is driven entirely by SMB2 CREATE/WRITE/SET_INFO requests sent by a remote peer over the network.\nAC:L - The attacker owns both connections involved (the oplock holder and the breaker) and controls exactly how many unbalanced decrements occur by sending N writes, so `r_count` can be steered to zero or negative deterministically; no condition outside the attacker's control is needed.\nPR:L - Obtaining a level-II oplock or read-caching lease requires an open file handle, which requires a completed SMB2 session setup and tree connect with valid credentials — a low-privileged authenticated share user suffices.\nUI:N - The attacker triggers the oplock break itself by writing to or truncating the file from a second connection; no action by any local user or administrator is required.\nS:U - The corruption and its consequences (hung ksmbd kthread, freed ksmbd_conn/transport reuse) remain entirely within the kernel's own security authority.\nC:H - The underflow lets the connection teardown free `ksmbd_conn`, the transport and the socket while an in-flight work item still dereferences them, and the attacker can reoccupy that slab with request-buffer data, yielding a use-after-free read primitive over kernel memory including session keys and credentials.\nI:H - The same use-after-free gives writes through the stale `work->conn`/`work->sess` pointers and via `ksmbd_conn_write()` into freed and reallocated memory, which is the standard basis for heap-spray-driven control-flow hijacking.\nA:H - A negative `r_count` makes `wait_event(conn->r_count_q, r_count == 0)` unsatisfiable, hanging the `ksmbd:%u` kthread uninterruptibly and permanently leaking the socket, connection and sessions; this is repeatable per connection until resources are exhausted, and the UAF variant additionally causes kernel oopses."
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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/smb/server/oplock.c"
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],
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"versions": [
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{
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"version": "8e6508c7ecb1802909f294827eff38f301d0c937",
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"lessThan": "8829849da3f68697b830a5b36047b0d8a50ae3ed",
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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": "09aeab68033161cb54f194da93e51a11aee6144b",
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"lessThan": "4790bcb269e5d6d88200a67c54ae6d627332a3be",
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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": "a4261bbc33fbf99b99c80aa3a2c5097611802980",
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"lessThan": "457db486203c90e10c3efc87fd45cc7000b1cd36",
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"status": "affected",
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"versionType": "git"
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},
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{
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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": "3aa660c059240e0c795217182cf7df32909dd917",
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"lessThan": "c2ec33d46b4d1c8085dab5d02e00b21f4f0fb8a9",
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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": "3aa660c059240e0c795217182cf7df32909dd917",
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"lessThan": "ddb7ea36ba7129c2ed107e2186591128618864e1",
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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": "6.6.84",
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"lessThan": "6.6.87",
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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": "6.12.20",
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"lessThan": "6.12.23",
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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": "6.13.8",
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"lessThan": "6.13.11",
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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": "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/smb/server/oplock.c"
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],
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"versions": [
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{
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"version": "6.14",
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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": "6.14",
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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": "6.6.87",
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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": "6.12.23",
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"lessThanOrEqual": "6.12.*",
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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": "6.13.11",
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"lessThanOrEqual": "6.13.*",
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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": "6.14.2",
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"lessThanOrEqual": "6.14.*",
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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": "6.15",
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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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"nodes": [
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"operator": "OR",
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"negate": false,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6.84",
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/8829849da3f68697b830a5b36047b0d8a50ae3ed"
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},
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{
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"url": "https://git.kernel.org/stable/c/4790bcb269e5d6d88200a67c54ae6d627332a3be"
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},
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{
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"url": "https://git.kernel.org/stable/c/457db486203c90e10c3efc87fd45cc7000b1cd36"
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},
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{
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"url": "https://git.kernel.org/stable/c/20378cf48359f39dee0ef9b61470ebe77bd49c0d"
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{
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"url": "https://git.kernel.org/stable/c/c2ec33d46b4d1c8085dab5d02e00b21f4f0fb8a9"
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{
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"url": "https://git.kernel.org/stable/c/ddb7ea36ba7129c2ed107e2186591128618864e1"
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}
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],
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"title": "ksmbd: fix r_count dec/increment mismatch",
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"x_generator": {
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