{"cve":"CVE-2022-48658","nvd":{"published":"2024-04-28T13:15:07.760","modified":"2026-08-04T10:17:14.683","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":[],"references":["https://git.kernel.org/stable/c/61703b248be993eb4997b00ae5d3318e6d8f3c5b","https://git.kernel.org/stable/c/df6cb39335cf5a1b918e8dbd8ba7cd9f1d00e45a","https://git.kernel.org/stable/c/e45cc288724f0cfd497bb5920bcfa60caa335729","https://git.kernel.org/stable/c/61703b248be993eb4997b00ae5d3318e6d8f3c5b","https://git.kernel.org/stable/c/df6cb39335cf5a1b918e8dbd8ba7cd9f1d00e45a"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:49:08.435428910+00:00"},"epss":{"cve":"CVE-2022-48658","score":0.00673,"percentile":0.5211,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}