{ "cveId": "CVE-2025-21983", "url": "https://patchblox.com/security/cve/CVE-2025-21983", "summary": "CVE-2025-21983 is fixed in 36 products on 1 platform, first by DEBIAN-CVE-2025-21983, released April 1, 2025. It is not reported as exploited. Patch Radar priority: High.", "title": "linux: In the Linux kernel, the following vulnerability has been resolved: mm/slab/kvfree_rcu: Switch to WQ_MEM_RECLAIM wq...", "description": "In the Linux kernel, the following vulnerability has been resolved: mm/slab/kvfree_rcu: Switch to WQ_MEM_RECLAIM wq Currently kvfree_rcu() APIs use a system workqueue which is \u0022system_unbound_wq\u0022 to driver RCU machinery to reclaim a memory. Recently, it has been noted that the following kernel warning can be observed: \u003Csnip\u003E workqueue: WQ_MEM_RECLAIM nvme-wq:nvme_scan_work is flushing !WQ_MEM_RECLAIM events_unbound:kfree_rcu_work WARNING: CPU: 21 PID: 330 at kernel/workqueue.c:3719 check_flush_dependency\u002B0x112/0x120 Modules linked in: intel_uncore_frequency(E) intel_uncore_frequency_common(E) skx_edac(E) ... CPU: 21 UID: 0 PID: 330 Comm: kworker/u144:6 Tainted: G E 6.13.2-0_g925d379822da #1 Hardware name: Wiwynn Twin Lakes MP/Twin Lakes Passive MP, BIOS YMM20 02/01/2023 Workqueue: nvme-wq nvme_scan_work RIP: 0010:check_flush_dependency\u002B0x112/0x120 Code: 05 9a 40 14 02 01 48 81 c6 c0 00 00 00 48 8b 50 18 48 81 c7 c0 00 00 00 48 89 f9 48 ... RSP: 0018:ffffc90000df7bd8 EFLAGS: 00010082 RAX: 000000000000006a RBX: ffffffff81622390 RCX: 0000000000000027 RDX: 00000000fffeffff RSI: 000000000057ffa8 RDI: ffff88907f960c88 RBP: 0000000000000000 R08: ffffffff83068e50 R09: 000000000002fffd R10: 0000000000000004 R11: 0000000000000000 R12: ffff8881001a4400 R13: 0000000000000000 R14: ffff88907f420fb8 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88907f940000(0000) knlGS:0000000000000000 CR2: 00007f60c3001000 CR3: 000000107d010005 CR4: 00000000007726f0 PKRU: 55555554 Call Trace: \u003CTASK\u003E ? __warn\u002B0xa4/0x140 ? check_flush_dependency\u002B0x112/0x120 ? report_bug\u002B0xe1/0x140 ? check_flush_dependency\u002B0x112/0x120 ? handle_bug\u002B0x5e/0x90 ? exc_invalid_op\u002B0x16/0x40 ? asm_exc_invalid_op\u002B0x16/0x20 ? timer_recalc_next_expiry\u002B0x190/0x190 ? check_flush_dependency\u002B0x112/0x120 ? check_flush_dependency\u002B0x112/0x120 __flush_work.llvm.1643880146586177030\u002B0x174/0x2c0 flush_rcu_work\u002B0x28/0x30 kvfree_rcu_barrier\u002B0x12f/0x160 kmem_cache_destroy\u002B0x18/0x120 bioset_exit\u002B0x10c/0x150 disk_release.llvm.6740012984264378178\u002B0x61/0xd0 device_release\u002B0x4f/0x90 kobject_put\u002B0x95/0x180 nvme_put_ns\u002B0x23/0xc0 nvme_remove_invalid_namespaces\u002B0xb3/0xd0 nvme_scan_work\u002B0x342/0x490 process_scheduled_works\u002B0x1a2/0x370 worker_thread\u002B0x2ff/0x390 ? pwq_release_workfn\u002B0x1e0/0x1e0 kthread\u002B0xb1/0xe0 ? __kthread_parkme\u002B0x70/0x70 ret_from_fork\u002B0x30/0x40 ? __kthread_parkme\u002B0x70/0x70 ret_from_fork_asm\u002B0x11/0x20 \u003C/TASK\u003E ---[ end trace 0000000000000000 ]--- \u003Csnip\u003E To address this switch to use of independent WQ_MEM_RECLAIM workqueue, so the rules are not violated from workqueue framework point of view. Apart of that, since kvfree_rcu() does reclaim memory it is worth to go with WQ_MEM_RECLAIM type of wq because it is designed for this purpose.", "published": "2025-04-01T16:15:29Z", "severity": "high", "cvss": 7.8, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "epss": 0.00199, "epssPercentile": 0.09842, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "fixes": [ { "platform": "linux", "product": "kernel-uek", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-core", "release": "ol 10", 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10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-debug-core", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-debug-devel", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-debug-devel", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": 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