{"id":62562,"date":"2026-06-14T04:02:10","date_gmt":"2026-06-14T04:02:10","guid":{"rendered":"https:\/\/zero.redgem.net\/?p=62562"},"modified":"2026-06-14T04:02:10","modified_gmt":"2026-06-14T04:02:10","slug":"nvmet-avoid-recursive-nvmet-wq-flush-in-nvmetctrlfree","status":"publish","type":"post","link":"https:\/\/zero.redgem.net\/?p=62562","title":{"rendered":"nvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free_CVE-2026-46304"},"content":{"rendered":"

{“lastseen”:””,”description”:”In the Linux kernel, the following vulnerability has been resolved:\\n\\nnvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free\\n\\nnvmet_tcp_release_queue_work() runs on nvmet-wq and can drop the\\nfinal controller reference through nvmet_cq_put(). If that triggers\\nnvmet_ctrl_free(), the teardown path flushes ctrl-\\u003easync_event_work on\\nthe same nvmet-wq.\\n\\nCall chain:\\n\\n nvmet_tcp_schedule_release_queue()\\n kref_put(\\u0026queue-\\u003ekref, nvmet_tcp_release_queue)\\n nvmet_tcp_release_queue()\\n queue_work(nvmet_wq, \\u0026queue-\\u003erelease_work) \\u003c— nvmet_wq\\n process_one_work()\\n nvmet_tcp_release_queue_work()\\n nvmet_cq_put(\\u0026queue-\\u003envme_cq)\\n nvmet_cq_destroy()\\n nvmet_ctrl_put(cq-\\u003ectrl)\\n nvmet_ctrl_free()\\n flush_work(\\u0026ctrl-\\u003easync_event_work) \\u003c— nvmet_wq\\n\\n Previously Scheduled by :-\\n\\t\\t nvmet_add_async_event\\n\\t\\t queue_work(nvmet_wq, \\u0026ctrl-\\u003easync_event_work);\\n\\nThis trips lockdep with a possible recursive locking warning.\\n\\n[ 5223.015876] run blktests nvme\/003 at 2026-04-07 20:53:55\\n[ 5223.061801] loop0: detected capacity change from 0 to 2097152\\n[ 5223.072206] nvmet: adding nsid 1 to subsystem blktests-subsystem-1\\n[ 5223.088368] nvmet_tcp: enabling port 0 (127.0.0.1:4420)\\n[ 5223.126086] nvmet: Created discovery controller 1 for subsystem nqn.2014-08.org.nvmexpress.discovery for NQN nqn.2014-08.org.nvmexpress:uuid:0f01fb42-9f7f-4856-b0b3-51e60b8de349.\\n[ 5223.128453] nvme nvme1: new ctrl: NQN \\”nqn.2014-08.org.nvmexpress.discovery\\”, addr 127.0.0.1:4420, hostnqn: nqn.2014-08.org.nvmexpress:uuid:0f01fb42-9f7f-4856-b0b3-51e60b8de349\\n[ 5233.199447] nvme nvme1: Removing ctrl: NQN \\”nqn.2014-08.org.nvmexpress.discovery\\”\\n\\n[ 5233.227718] ============================================\\n[ 5233.231283] WARNING: possible recursive locking detected\\n[ 5233.234696] 7.0.0-rc3nvme+ #20 Tainted: G O N\\n[ 5233.238434] ——————————————–\\n[ 5233.241852] kworker\/u192:6\/2413 is trying to acquire lock:\\n[ 5233.245429] ffff888111632548 ((wq_completion)nvmet-wq){+.+.}-{0:0}, at: touch_wq_lockdep_map+0x26\/0x90\\n[ 5233.251438]\\n but task is already holding lock:\\n[ 5233.255254] ffff888111632548 ((wq_completion)nvmet-wq){+.+.}-{0:0}, at: process_one_work+0x5cc\/0x6e0\\n[ 5233.261125]\\n other info that might help us debug this:\\n[ 5233.265333] Possible unsafe locking scenario:\\n\\n[ 5233.269217] CPU0\\n[ 5233.270795] —-\\n[ 5233.272436] lock((wq_completion)nvmet-wq);\\n[ 5233.275241] lock((wq_completion)nvmet-wq);\\n[ 5233.278020]\\n *** DEADLOCK ***\\n\\n[ 5233.281793] May be due to missing lock nesting notation\\n\\n[ 5233.286195] 3 locks held by kworker\/u192:6\/2413:\\n[ 5233.289192] #0: ffff888111632548 ((wq_completion)nvmet-wq){+.+.}-{0:0}, at: process_one_work+0x5cc\/0x6e0\\n[ 5233.294569] #1: ffffc9000e2a7e40 ((work_completion)(\\u0026queue-\\u003erelease_work)){+.+.}-{0:0}, at: process_one_work+0x1c5\/0x6e0\\n[ 5233.300128] #2: ffffffff82d7dc40 (rcu_read_lock){….}-{1:3}, at: __flush_work+0x62\/0x530\\n[ 5233.304290]\\n stack backtrace:\\n[ 5233.306520] CPU: 4 UID: 0 PID: 2413 Comm: kworker\/u192:6 Tainted: G O N 7.0.0-rc3nvme+ #20 PREEMPT(full)\\n[ 5233.306524] Tainted: [O]=OOT_MODULE, [N]=TEST\\n[ 5233.306525] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04\/01\/2014\\n[ 5233.306527] Workqueue: nvmet-wq nvmet_tcp_release_queue_work [nvmet_tcp]\\n[ 5233.306532] Call Trace:\\n[ 5233.306534] \\u003cTASK\\u003e\\n[ 5233.306536] dump_stack_lvl+0x73\/0xb0\\n[ 5233.306552] print_deadlock_bug+0x225\/0x2f0\\n[ 5233.306556] __lock_acquire+0x13f0\/0x2290\\n[ 5233.306563] lock_acquire+0xd0\/0x300\\n[ 5233.306565] ? touch_wq_lockdep_map+0x26\/0x90\\n[ 5233.306571] ? __flush_work+0x20b\/0x530\\n[ 5233.306573] ? touch_wq_lockdep_map+0x26\/0x90\\n[ 5233.306577] touch_wq_lockdep_map+0x3b\/0x90\\n[ 5233.306580] ? touch_wq_lockdep_map+0x26\/0x90\\n[ 52\\n—truncated—“,”published”:”2026-06-08T15:46:31.747Z”,”modified”:”2026-06-14T04:30:05.308Z”,”type”:”cve”,”title”:”nvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free”,”source”:”Linux”,”references”:”https:\/\/git.kernel.org\/stable\/c\/ae5b0cad163833e10b271e9becc05d81dae56e5f\\nhttps:\/\/git.kernel.org\/stable\/c\/8d66ba89480ff098a58d79003a505f383aa4e920\\nhttps:\/\/git.kernel.org\/stable\/c\/a696fbbd5240b4ac9b166f7bd4c550882ff543f1\\nhttps:\/\/git.kernel.org\/stable\/c\/9a4d7222c0955b221e38bb66d10e6bccb672c8a1\\nhttps:\/\/git.kernel.org\/stable\/c\/ee6e20c4bc9eae542a0954a368449532383169d4\\nhttps:\/\/git.kernel.org\/stable\/c\/781f47d641432c26c19625b2cdd7f40825097592\\nhttps:\/\/git.kernel.org\/stable\/c\/551f445a56a11a6457550cddcf39c9ebb8bcacc6\\nhttps:\/\/git.kernel.org\/stable\/c\/aade8abd8b868b6ffa9697aadaea28ec7f65bee6″,”id”:”CVE-2026-46304″,”bulletinFamily”:””,”cwe”:null,”cvelist”:null,”sourceData”:”Linux Linux 06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5\\nLinux Linux 06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5\\nLinux Linux 06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5\\nLinux Linux 06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5\\nLinux Linux 06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5\\nLinux Linux 06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5\\nLinux Linux 06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5\\nLinux Linux 06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5\\nLinux Linux 3976dd677e891c0b2c63d08028d445663539472c\\nLinux Linux 4.9.68\\nLinux Linux 4.10″,”sourceHref”:””,”cvss”:{“score”:7.5,”severity”:”HIGH”,”vector”:”CVSS:3.1\/AV:N\/AC:L\/PR:N\/UI:N\/S:U\/C:N\/I:N\/A:H”,”version”:”3.1″},”cvss2″:{},”cvss3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””,”cvssV3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””}},”href”:””,”category_name”:”CVE”,”post_link”:””,”product”:”Linux”,”version”:”06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5″,”vendor”:”Linux”,”ai_description”:””,”ai_severity”:””,”ai_vendor”:””,”ai_product”:””,”ai_version”:””,”ai_score”:0}<\/p>\n","protected":false},"excerpt":{"rendered":"

{“lastseen”:””,”description”:”In the Linux kernel, the following vulnerability has been resolved:\\n\\nnvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free\\n\\nnvmet_tcp_release_queue_work() runs on nvmet-wq and can drop the\\nfinal controller reference…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[6,8,16,12,15,13,7,11,5],"class_list":["post-62562","post","type-post","status-publish","format-standard","hentry","category-category_cve","tag-cve","tag-cvss","tag-cvss-75","tag-exploit","tag-high","tag-news","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"\nnvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free_CVE-2026-46304 - zero redgem<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zero.redgem.net\/?p=62562\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"nvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free_CVE-2026-46304 - 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