180 lines
10 KiB
JSON
180 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-2023-54135",
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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": "2025-12-24T13:02:52.522Z",
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"datePublished": "2025-12-24T13:06:51.329Z",
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"dateUpdated": "2026-08-05T09:17:33.212Z"
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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": "2026-08-05T09:17:33.212Z"
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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\nmaple_tree: fix potential out-of-bounds access in mas_wr_end_piv()\n\nCheck the write offset end bounds before using it as the offset into the\npivot array. This avoids a possible out-of-bounds access on the pivot\narray if the write extends to the last slot in the node, in which case the\nnode maximum should be used as the end pivot.\n\nakpm: this doesn't affect any current callers, but new users of mapletree\nmay encounter this problem if backported into earlier kernels, so let's\nfix it in -stable kernels in case of this."
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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 maple tree write path is reached only through local syscalls — `mmap()`, `munmap()`, `mprotect()`, `mremap()`, `brk()` via `vma_iter_store*()`/`vma_iter_clear*()` → `mas_store_gfp()`/`mas_store_prealloc()` → `mas_wr_end_piv()`. The other in-tree users (btrfs send LRU cache, regcache-maple) are likewise local/driver-internal, with no remote packet-processing path.\nAC:L - The trigger is a completely full 16-slot leaf node plus a store whose range starts in an earlier slot and ends inside the final slot — a tree shape an unprivileged attacker deterministically constructs by creating thousands of non-mergeable VMAs and then unmapping a spanning range. No race and no memory layout outside the attacker's influence is involved.\nPR:L - Any unprivileged local process reaches the code with plain `mmap()`/`munmap()` calls on its own address space; there is no capability check, LSM gate, or namespace requirement anywhere along `do_vmi_align_munmap()` → `vma_iter_clear_gfp()` → `mas_wr_store_entry()`.\nUI:N - The attacking process triggers the faulty write path entirely through its own address-space syscalls; no victim action, mount, or file open is required.\nS:U - The out-of-bounds pivot read and the resulting maple-tree corruption are confined to the kernel's own memory-management structures, which are the same security authority as the compromised kernel. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The array overrun reads a live kernel pointer (`slot[0]`, a `struct vm_area_struct *`) and turns it into a range boundary, and the resulting `mas->last`/`new_end` corruption leaves stale VMA pointers and bogus ranges in the VMA tree — memory corruption that can be leveraged into an arbitrary-read primitive, and whose pivot values are indirectly observable through mmap gap placement.\nI:H - A bogus `end_piv` propagates into `mas_wr_extend_null()`, which can set `mas->last` to a kernel heap pointer value beyond the node's `mas->max`, and into `mas_wr_node_store()`'s `new_end` computation, causing the store to overwrite the wrong ranges and leave stale slots — VMA-tree corruption exploitable for use-after-free and arbitrary-write primitives.\nA:H - Writing a range past the node maximum and leaving stale slots violates maple-tree invariants, producing `MT_BUG_ON`/`VM_BUG_ON` hits, oopses, or use-after-free on `vm_area_struct` during any subsequent tree walk or address-space teardown, crashing the kernel."
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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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"lib/maple_tree.c"
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],
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"versions": [
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{
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"version": "54a611b605901c7d5d05b6b8f5d04a6ceb0962aa",
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"lessThan": "4e2ad53ababeaac44d71162650984abfe783960c",
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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": "54a611b605901c7d5d05b6b8f5d04a6ceb0962aa",
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"lessThan": "dc4751bd4aba01ccfc02f91adfeee0ba4cda405c",
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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": "54a611b605901c7d5d05b6b8f5d04a6ceb0962aa",
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"lessThan": "f5fcf6555a2a4f32947d17b92b173837cc652891",
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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": "54a611b605901c7d5d05b6b8f5d04a6ceb0962aa",
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"lessThan": "cd00dd2585c4158e81fdfac0bbcc0446afbad26d",
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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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"lib/maple_tree.c"
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],
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"versions": [
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{
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"version": "6.1",
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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": "6.1",
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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": "6.1.37",
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"lessThanOrEqual": "6.1.*",
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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": "6.3.11",
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"lessThanOrEqual": "6.3.*",
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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": "6.4.1",
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"lessThanOrEqual": "6.4.*",
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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": "6.5",
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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": "6.1",
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"versionEndExcluding": "6.1.37"
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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": "6.1",
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"versionEndExcluding": "6.3.11"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.1",
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"versionEndExcluding": "6.4.1"
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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": "6.1",
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"versionEndExcluding": "6.5"
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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/4e2ad53ababeaac44d71162650984abfe783960c"
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},
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{
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"url": "https://git.kernel.org/stable/c/dc4751bd4aba01ccfc02f91adfeee0ba4cda405c"
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},
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{
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"url": "https://git.kernel.org/stable/c/f5fcf6555a2a4f32947d17b92b173837cc652891"
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},
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{
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"url": "https://git.kernel.org/stable/c/cd00dd2585c4158e81fdfac0bbcc0446afbad26d"
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}
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],
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"title": "maple_tree: fix potential out-of-bounds access in mas_wr_end_piv()",
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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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} |