268 lines
14 KiB
JSON
268 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-2026-64073",
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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": "2026-07-19T07:54:57.031Z",
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"datePublished": "2026-07-19T15:39:48.463Z",
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"dateUpdated": "2026-10-19T20:28:11.133Z"
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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": "2026-08-05T12:38:54.369Z"
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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\nirq_work: Fix use-after-free in irq_work_single() on PREEMPT_RT\n\nOn PREEMPT_RT, non-HARD irq_work runs in per-CPU kthreads via\nrun_irq_workd(), so irq_work_sync() uses rcuwait() to wait for BUSY==0.\n\nAfter irq_work_single() clears BUSY via atomic_cmpxchg(), it still\ndereferences @work for irq_work_is_hard() and rcuwait_wake_up().\n\nAn irq_work_sync() caller on another CPU that enters after BUSY is cleared\ncan observe BUSY==0 immediately, return, and free the work before those\naccesses complete — causing a use-after-free.\n\nFix this by wrapping run_irq_workd() in guard(rcu)() so that the entire\nirq_work_single() execution is within an RCU read-side critical\nsection. Then add synchronize_rcu() in irq_work_sync() after\nrcuwait_wait_event() to ensure the caller waits for the RCU grace period\nbefore returning, preventing premature frees."
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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 - Exploitation requires reaching irq_work_sync() teardown paths via local syscalls (e.g. perf_event_open/close, bpf map teardown) that queue non-HARD irq_work on PREEMPT_RT; there is no direct network packet or remote-protocol entry point into irq_work.c.\nAC:L - The bug is a cross-CPU race where irq_work_sync() returns after BUSY is cleared while irq_work_single() still dereferences the work; an attacker can control both sides by concurrently closing/freeing a subsystem object and driving irq_work_queue() from another thread/CPU (e.g. perf fasync wakeup vs. close).\nPR:L - Unprivileged local users can reach vulnerable teardown via perf_event_open/close on per-task events (exclude_kernel=1, default paranoid=2) and via bpf() ringbuf/map cleanup when CAP_BPF is available in a user namespace; no init-namespace root is required for the highest-impact paths.\nUI:N - Exploitation is driven entirely by the attacker's own syscalls and threading; no victim interaction such as opening files or mounting filesystems is needed.\nS:U - Successful exploitation corrupts or reads kernel memory and can yield local privilege escalation within the same kernel security authority; it does not inherently cross a VM/host, IOMMU, or container boundary by itself.\nC:H - This is a kernel heap use-after-free: irq_work_single() dereferences a freed irq_work embedded in structures like perf_event or bpf_ringbuf, enabling arbitrary kernel memory disclosure through heap reuse and controlled reads of stale object fields.\nI:H - The UAF permits attacker-controlled reallocation of the freed irq_work container object, providing a standard kernel heap corruption primitive that can be developed into arbitrary write or control-flow hijack, not merely a bounded modification.\nA:H - Use-after-free in irq_work_single() can immediately fault or panic the kernel during post-BUSY dereferences, and repeated triggering via perf/BPF open-close races can cause persistent denial of service on PREEMPT_RT systems."
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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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"kernel/irq_work.c"
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],
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"versions": [
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{
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"version": "810979682ccc98dbd83f341c18a2e556c30a7164",
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"lessThan": "2dc79362302922cb18f35e262712b5e58de65442",
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"status": "affected",
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"versionType": "git"
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"version": "810979682ccc98dbd83f341c18a2e556c30a7164",
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"status": "affected",
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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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"kernel/irq_work.c"
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],
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"versions": [
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{
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"version": "5.16",
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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": "5.16",
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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": "6.1.175",
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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": "6.6.142",
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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": "6.12.92",
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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": "6.18.34",
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"lessThanOrEqual": "6.18.*",
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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": "7.0.11",
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"lessThanOrEqual": "7.0.*",
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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": "7.1",
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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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"references": [
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"url": "https://git.kernel.org/stable/c/2dc79362302922cb18f35e262712b5e58de65442"
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},
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{
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"url": "https://git.kernel.org/stable/c/eef4f71b46a9929ac33e968538c9dd5d96a02460"
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"url": "https://git.kernel.org/stable/c/684a78183c54c23e70d1cba320f7fc184604210b"
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"url": "https://git.kernel.org/stable/c/18c0456ea2615b1a743a6db739c74411c3b42bc6"
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{
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"url": "https://git.kernel.org/stable/c/81b582784518196eff1050212a046bc29d3a05dd"
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{
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"url": "https://git.kernel.org/stable/c/91840be8f710370607f949a627e070896faeddb8"
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}
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],
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"title": "irq_work: Fix use-after-free in irq_work_single() on PREEMPT_RT",
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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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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-64073",
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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": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:36:05.350468Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-416",
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"description": "CWE-416 Use After Free"
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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": "2026-10-19T20:28:11.133Z"
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}
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}
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]
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}
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} |