CVE-2022-48658 (GCVE-0-2022-48658)

Vulnerability from cvelistv5 – Published: 2024-04-28 13:01 – Updated: 2026-08-05 08:51
VLAI
Title
mm: slub: fix flush_cpu_slab()/__free_slab() invocations in task context.
Summary
In the Linux kernel, the following vulnerability has been resolved: mm: slub: fix flush_cpu_slab()/__free_slab() invocations in task context. Commit 5a836bf6b09f ("mm: slub: move flush_cpu_slab() invocations __free_slab() invocations out of IRQ context") moved all flush_cpu_slab() invocations to the global workqueue to avoid a problem related with deactivate_slab()/__free_slab() being called from an IRQ context on PREEMPT_RT kernels. When the flush_all_cpu_locked() function is called from a task context it may happen that a workqueue with WQ_MEM_RECLAIM bit set ends up flushing the global workqueue, this will cause a dependency issue. workqueue: WQ_MEM_RECLAIM nvme-delete-wq:nvme_delete_ctrl_work [nvme_core] is flushing !WQ_MEM_RECLAIM events:flush_cpu_slab WARNING: CPU: 37 PID: 410 at kernel/workqueue.c:2637 check_flush_dependency+0x10a/0x120 Workqueue: nvme-delete-wq nvme_delete_ctrl_work [nvme_core] RIP: 0010:check_flush_dependency+0x10a/0x120[ 453.262125] Call Trace: __flush_work.isra.0+0xbf/0x220 ? __queue_work+0x1dc/0x420 flush_all_cpus_locked+0xfb/0x120 __kmem_cache_shutdown+0x2b/0x320 kmem_cache_destroy+0x49/0x100 bioset_exit+0x143/0x190 blk_release_queue+0xb9/0x100 kobject_cleanup+0x37/0x130 nvme_fc_ctrl_free+0xc6/0x150 [nvme_fc] nvme_free_ctrl+0x1ac/0x2b0 [nvme_core] Fix this bug by creating a workqueue for the flush operation with the WQ_MEM_RECLAIM bit set.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:46 UTC
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 5a836bf6b09f99ead1b69457ff39ab3011ece57b , < 61703b248be993eb4997b00ae5d3318e6d8f3c5b (git)
Affected: 5a836bf6b09f99ead1b69457ff39ab3011ece57b , < df6cb39335cf5a1b918e8dbd8ba7cd9f1d00e45a (git)
Affected: 5a836bf6b09f99ead1b69457ff39ab3011ece57b , < e45cc288724f0cfd497bb5920bcfa60caa335729 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.71 , ≤ 5.15.* (semver)
Unaffected: 5.19.12 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
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            "type": "Primary"
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    "redhat_vex": {
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      "current_release_date": "2026-10-02T02:26:56+00:00",
      "cve": "CVE-2022-48658",
      "id": "CVE-2022-48658",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "78",
      "product_status:known_not_affected": "120",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm: slub: fix flush_cpu_slab()/__free_slab() invocations in task context.",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-48658.json",
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                    "id": "CVE-2022-48658",
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                    "timestamp": "2024-09-10T15:46:04.814997Z",
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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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                  "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\u2192flush_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\u2019s 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\u2019s 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\u2192!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\u2014flush behavior is otherwise correct\u2014so 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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        "dateReserved": "2024-02-25T13:44:28.317Z",
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}



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