221 lines
11 KiB
JSON
221 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-2025-21786",
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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": "2024-12-29T08:45:45.765Z",
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"datePublished": "2025-02-27T02:18:26.406Z",
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"dateUpdated": "2026-08-05T11:54:24.903Z"
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},
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"shortName": "Linux",
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},
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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\nworkqueue: Put the pwq after detaching the rescuer from the pool\n\nThe commit 68f83057b913(\"workqueue: Reap workers via kthread_stop() and\nremove detach_completion\") adds code to reap the normal workers but\nmistakenly does not handle the rescuer and also removes the code waiting\nfor the rescuer in put_unbound_pool(), which caused a use-after-free bug\nreported by Cheung Wall.\n\nTo avoid the use-after-free bug, the pool’s reference must be held until\nthe detachment is complete. Therefore, move the code that puts the pwq\nafter detaching the rescuer from the pool."
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},
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{
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"lang": "en",
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"value": "AV:L - The vulnerability is in the core workqueue rescuer path and is reached by generating local workqueue load and memory pressure; there is no remote input path into `rescuer_thread()`. Exploitation requires the attacker to be executing code on the system.\nAC:L - The attacker fully controls the side of the race that matters — sustained memory pressure plus queued work on an unbound `WQ_MEM_RECLAIM` workqueue drives `pool_mayday_timeout()`/`send_mayday()` at will and can be looped indefinitely, so the narrow window between `put_pwq()` and `worker_detach_from_pool()` can be retried unboundedly until the RCU free lands first.\nPR:L - Any unprivileged local user can create the required conditions — allocating memory to stall `create_worker()` and issuing filesystem/block/network I/O that queues work on unbound `WQ_MEM_RECLAIM` workqueues (ext4-rsv-conversion, xfs, nfsiod, rpciod, scsi hosts). No capability check guards the rescuer path.\nUI:N - The rescuer is summoned automatically by the workqueue watchdog timer under memory pressure; no action by any other user or administrator-victim is needed to complete the attack.\nS:U - The freed object and the corruption both live in kernel heap memory within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The freed `struct worker_pool` is read after free (`pool->flags`, `worker->node` list pointers) and comes from a generic kmalloc cache, so a reallocated victim object leaks its contents through the rescuer's list manipulation, giving a path to arbitrary kernel memory disclosure.\nI:H - `detach_worker()`'s `list_del(&worker->node)` performs a write-after-free of kernel pointers at the fixed offset of `pool->workers` into the freed slab object, which after heap spraying yields a controlled-offset write primitive usable for control-flow hijack and privilege escalation.\nA:H - Use-after-free on the worker pool corrupts the attached-workers list and typically produces an immediate oops/panic (KASAN reported it as a UAF), permanently wedging or 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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"kernel/workqueue.c"
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"version": "0",
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"lessThan": "6.11",
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"status": "unaffected",
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"versionType": "semver"
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},
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"version": "6.12.16",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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},
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"lessThanOrEqual": "6.13.*",
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"status": "unaffected",
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},
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{
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"version": "6.14",
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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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{
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"url": "https://git.kernel.org/stable/c/e7c16028a424dd35be1064a68fa318be4359310f"
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},
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"url": "https://git.kernel.org/stable/c/835b69c868f53f959d4986bbecd561ba6f38e492"
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"title": "workqueue: Put the pwq after detaching the rescuer from the pool",
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-21786",
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"role": "CISA Coordinator",
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"options": [
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{
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"Automatable": "no"
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{
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"Technical Impact": "total"
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"version": "2.0.3",
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"timestamp": "2025-02-27T18:14:15.335144Z"
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"type": "CWE",
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"description": "CWE-416 Use After Free"
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}
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]
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} |