{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-48658", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-25T13:44:28.317Z", "datePublished": "2024-04-28T13:01:12.987Z", "dateUpdated": "2026-08-05T08:51:39.776Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:51:39.776Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "mm/slub.c" ], "versions": [ { "version": "5a836bf6b09f99ead1b69457ff39ab3011ece57b", "lessThan": "61703b248be993eb4997b00ae5d3318e6d8f3c5b", "status": "affected", "versionType": "git" }, { "version": "5a836bf6b09f99ead1b69457ff39ab3011ece57b", "lessThan": "df6cb39335cf5a1b918e8dbd8ba7cd9f1d00e45a", "status": "affected", "versionType": "git" }, { "version": "5a836bf6b09f99ead1b69457ff39ab3011ece57b", "lessThan": "e45cc288724f0cfd497bb5920bcfa60caa335729", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "mm/slub.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.71", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19.12", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "5.15.71" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "5.19.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/61703b248be993eb4997b00ae5d3318e6d8f3c5b" }, { "url": "https://git.kernel.org/stable/c/df6cb39335cf5a1b918e8dbd8ba7cd9f1d00e45a" }, { "url": "https://git.kernel.org/stable/c/e45cc288724f0cfd497bb5920bcfa60caa335729" } ], "title": "mm: slub: fix flush_cpu_slab()/__free_slab() invocations in task context.", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T15:17:55.669Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/61703b248be993eb4997b00ae5d3318e6d8f3c5b", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/df6cb39335cf5a1b918e8dbd8ba7cd9f1d00e45a", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/e45cc288724f0cfd497bb5920bcfa60caa335729", "tags": [ "x_transferred" ] } ] }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2022-48658", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T15:46:04.814997Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:33:55.526Z" } } ] } }