221 lines
12 KiB
JSON
221 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-2022-48658",
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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": "2024-02-25T13:44:28.317Z",
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"datePublished": "2024-04-28T13:01:12.987Z",
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"dateUpdated": "2026-08-05T08:51:39.776Z"
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},
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"dateUpdated": "2026-08-05T08:51:39.776Z"
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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\nmm: slub: fix flush_cpu_slab()/__free_slab() invocations in task context.\n\nCommit 5a836bf6b09f (\"mm: slub: move flush_cpu_slab() invocations\n__free_slab() invocations out of IRQ context\") moved all flush_cpu_slab()\ninvocations to the global workqueue to avoid a problem related\nwith deactivate_slab()/__free_slab() being called from an IRQ context\non PREEMPT_RT kernels.\n\nWhen the flush_all_cpu_locked() function is called from a task context\nit may happen that a workqueue with WQ_MEM_RECLAIM bit set ends up\nflushing the global workqueue, this will cause a dependency issue.\n\n workqueue: WQ_MEM_RECLAIM nvme-delete-wq:nvme_delete_ctrl_work [nvme_core]\n is flushing !WQ_MEM_RECLAIM events:flush_cpu_slab\n WARNING: CPU: 37 PID: 410 at kernel/workqueue.c:2637\n check_flush_dependency+0x10a/0x120\n Workqueue: nvme-delete-wq nvme_delete_ctrl_work [nvme_core]\n RIP: 0010:check_flush_dependency+0x10a/0x120[ 453.262125] Call Trace:\n __flush_work.isra.0+0xbf/0x220\n ? __queue_work+0x1dc/0x420\n flush_all_cpus_locked+0xfb/0x120\n __kmem_cache_shutdown+0x2b/0x320\n kmem_cache_destroy+0x49/0x100\n bioset_exit+0x143/0x190\n blk_release_queue+0xb9/0x100\n kobject_cleanup+0x37/0x130\n nvme_fc_ctrl_free+0xc6/0x150 [nvme_fc]\n nvme_free_ctrl+0x1ac/0x2b0 [nvme_core]\n\nFix this bug by creating a workqueue for the flush operation with\nthe WQ_MEM_RECLAIM bit set."
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}
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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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 - The documented trigger is NVMe controller teardown on nvme-delete-wq; over NVMe-TCP/RDMA a remote fabric peer can force reconnect exhaustion and nvme_delete_ctrl(), reaching kmem_cache_destroy→flush_all_cpus_locked without local access.\nAC:L - A peer that drops the connection and refuses reconnects deterministically drives controller deletion into flush_all_cpus_locked’s schedule_work_on(system_wq)+flush_work path; no race or attacker-uncontrollable layout is required.\nPR:N - Teardown is driven by remote transport/reconnect-failure events on an already-configured NVMe-oF link; the peer needs no local account or capabilities on the vulnerable host.\nUI:N - Reconnect and delete run from kernel workqueues after the peer-driven disconnect; no victim user action is required.\nS:U - The WARN and potential reclaim deadlock stay inside the host kernel’s workqueue/SLUB paths and do not cross a VM, IOMMU, or other security-authority boundary.\nC:N - This is only an illegal WQ_MEM_RECLAIM→!WQ_MEM_RECLAIM flush dependency; there is no UAF, OOB read, or other disclosure primitive.\nI:N - No out-of-bounds write, UAF, or other memory corruption occurs—flush behavior is otherwise correct—so there is no integrity or code-execution impact.\nA:H - check_flush_dependency() issues WARN_ONCE (panic under panic_on_warn), and the flagged condition is a real deadlock risk: a WQ_MEM_RECLAIM worker blocking on rescuer-less system_wq under memory pressure."
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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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"mm/slub.c"
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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