182 lines
10 KiB
JSON
182 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-2025-38717",
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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": "2025-04-16T04:51:24.033Z",
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"datePublished": "2025-09-04T15:33:11.686Z",
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"dateUpdated": "2026-08-05T12:04:14.893Z"
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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": "2026-08-05T12:04:14.893Z"
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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\nnet: kcm: Fix race condition in kcm_unattach()\n\nsyzbot found a race condition when kcm_unattach(psock)\nand kcm_release(kcm) are executed at the same time.\n\nkcm_unattach() is missing a check of the flag\nkcm->tx_stopped before calling queue_work().\n\nIf the kcm has a reserved psock, kcm_unattach() might get executed\nbetween cancel_work_sync() and unreserve_psock() in kcm_release(),\nrequeuing kcm->tx_work right before kcm gets freed in kcm_done().\n\nRemove kcm->tx_stopped and replace it by the less\nerror-prone disable_work_sync()."
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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 entirely by local syscalls — creating an AF_KCM socket, `SIOCKCMATTACH`/`SIOCKCMUNATTACH` ioctls, and `close()` — with no remote packet needed to reach the vulnerable window. No network-facing service parses attacker data on this path.\nAC:L - The attacker controls both sides of the race, running `kcm_release()` in one thread while a second thread issues `SIOCKCMUNATTACH` on the reserved psock, and can retry the loop indefinitely until the window between `cancel_work_sync()` and `unreserve_psock()` is hit. syzbot hit it repeatedly with three separate reproducers, and `CONFIG_AF_KCM` is shipped as a module by major distributions.\nPR:L - There is not a single `capable()` or `CAP_NET_ADMIN` check in `net/kcm/`, and the protocol family autoloads on an unprivileged `socket(AF_KCM, ...)` call via `MODULE_ALIAS_NETPROTO(PF_KCM)`. Any local unprivileged user can attach a TCP socket and trigger the race.\nUI:N - The attacker performs every step — socket creation, attach, unattach, and close — from its own threads. No victim action or cooperation is required.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The freed `struct kcm_sock` is reachable from a workqueue and is reallocatable by the attacker (its own slab cache, refillable simply by creating more KCM sockets), so the UAF yields a read primitive over adjacent/reused kernel objects and can leak arbitrary kernel memory.\nI:H - Queueing work on a freed object makes the workqueue write into freed memory, and `kcm_tx_work()` subsequently operates on attacker-groomed contents, culminating in the indirect call `sk->sk_write_space(sk)` in `kcm_write_msgs()` — a control-flow hijack / arbitrary-write path, not just corruption.\nA:H - Even unexploited, running `lock_sock()` and `kcm_write_msgs()` on a freed `kcm_sock` produces a KASAN-reported use-after-free, workqueue list corruption, and kernel oops/panic, which any unprivileged user can trigger repeatedly."
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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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"include/net/kcm.h",
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"net/kcm/kcmsock.c"
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],
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"versions": [
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{
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"version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
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"lessThan": "c0bffbc92a1ca3960fb9cdb8e9f75a68468eb308",
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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": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
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"lessThan": "7275dc3bb8f91b23125ff3f47b6529935cf46152",
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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": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
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"lessThan": "798733ee5d5788b12e8a52db1519abc17e826f69",
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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": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
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"lessThan": "52565a935213cd6a8662ddb8efe5b4219343a25d",
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"status": "affected",
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"versionType": "git"
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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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"include/net/kcm.h",
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"net/kcm/kcmsock.c"
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],
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"versions": [
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{
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"version": "4.6",
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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": "4.6",
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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": "6.12.43",
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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": "6.15.11",
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"lessThanOrEqual": "6.15.*",
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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": "6.16.2",
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"lessThanOrEqual": "6.16.*",
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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": "6.17",
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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": "4.6",
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"versionEndExcluding": "6.12.43"
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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": "4.6",
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"versionEndExcluding": "6.15.11"
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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": "4.6",
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"versionEndExcluding": "6.16.2"
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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": "4.6",
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"versionEndExcluding": "6.17"
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}
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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/c0bffbc92a1ca3960fb9cdb8e9f75a68468eb308"
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},
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{
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"url": "https://git.kernel.org/stable/c/7275dc3bb8f91b23125ff3f47b6529935cf46152"
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},
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{
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"url": "https://git.kernel.org/stable/c/798733ee5d5788b12e8a52db1519abc17e826f69"
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},
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{
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"url": "https://git.kernel.org/stable/c/52565a935213cd6a8662ddb8efe5b4219343a25d"
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}
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],
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"title": "net: kcm: Fix race condition in kcm_unattach()",
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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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}
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} |