{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-46304: nvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-46304","status":"final","version":"1","initial_release_date":"2026-06-08T15:46:31.747Z","current_release_date":"2026-06-14T04:30:05.308Z","revision_history":[{"date":"2026-06-08T15:46:31.747Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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->async_event_work on\nthe same nvmet-wq.\n\nCall chain:\n\n nvmet_tcp_schedule_release_queue()\n kref_put(&queue->kref, nvmet_tcp_release_queue)\n nvmet_tcp_release_queue()\n queue_work(nvmet_wq, &queue->release_work) <--- nvmet_wq\n process_one_work()\n nvmet_tcp_release_queue_work()\n nvmet_cq_put(&queue->nvme_cq)\n nvmet_cq_destroy()\n nvmet_ctrl_put(cq->ctrl)\n nvmet_ctrl_free()\n flush_work(&ctrl->async_event_work) <--- nvmet_wq\n\n Previously Scheduled by :-\n\t\t nvmet_add_async_event\n\t\t queue_work(nvmet_wq, &ctrl->async_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)(&queue->release_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] \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---","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-46304 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-46304"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-46304"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/ae5b0cad163833e10b271e9becc05d81dae56e5f"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/8d66ba89480ff098a58d79003a505f383aa4e920"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/a696fbbd5240b4ac9b166f7bd4c550882ff543f1"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/9a4d7222c0955b221e38bb66d10e6bccb672c8a1"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/ee6e20c4bc9eae542a0954a368449532383169d4"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/781f47d641432c26c19625b2cdd7f40825097592"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/551f445a56a11a6457550cddcf39c9ebb8bcacc6"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/aade8abd8b868b6ffa9697aadaea28ec7f65bee6"}]},"product_tree":{"branches":[{"category":"vendor","name":"Linux","branches":[{"category":"product_name","name":"Linux","branches":[{"category":"product_version_range","name":">=06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5 =06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5 =06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5 <8d66ba89480ff098a58d79003a505f383aa4e920","product":{"name":"Linux Linux >=06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5 <8d66ba89480ff098a58d79003a505f383aa4e920","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*"}}},{"category":"product_version_range","name":">=06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5 =06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5 =06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5 <9a4d7222c0955b221e38bb66d10e6bccb672c8a1","product":{"name":"Linux Linux >=06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5 <9a4d7222c0955b221e38bb66d10e6bccb672c8a1","product_id":"CSAFPID-4","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*"}}},{"category":"product_version_range","name":">=06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5 =06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5 =06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5 <781f47d641432c26c19625b2cdd7f40825097592","product":{"name":"Linux Linux >=06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5 <781f47d641432c26c19625b2cdd7f40825097592","product_id":"CSAFPID-6","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*"}}},{"category":"product_version_range","name":">=06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5 <551f445a56a11a6457550cddcf39c9ebb8bcacc6","product":{"name":"Linux Linux >=06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5 <551f445a56a11a6457550cddcf39c9ebb8bcacc6","product_id":"CSAFPID-7","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*"}}},{"category":"product_version_range","name":">=06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5 =06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5 =4.9.68 <4.10","product":{"name":"Linux Linux >=4.9.68 <4.10","product_id":"CSAFPID-10","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Linux","branches":[{"category":"product_name","name":"Linux","branches":[{"category":"product_version","name":"4.10","product":{"name":"Linux Linux 4.10","product_id":"CSAFPID-11","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:4.10:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"0","product":{"name":"Linux Linux 0","product_id":"CSAFPID-12","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:4.10:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"5.10.258","product":{"name":"Linux Linux 5.10.258","product_id":"CSAFPID-13","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:4.10:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"5.15.209","product":{"name":"Linux Linux 5.15.209","product_id":"CSAFPID-14","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:4.10:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"6.1.175","product":{"name":"Linux Linux 6.1.175","product_id":"CSAFPID-15","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:4.10:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"6.6.140","product":{"name":"Linux Linux 6.6.140","product_id":"CSAFPID-16","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:4.10:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"6.12.88","product":{"name":"Linux Linux 6.12.88","product_id":"CSAFPID-17","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:4.10:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"6.18.30","product":{"name":"Linux Linux 6.18.30","product_id":"CSAFPID-18","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:4.10:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"7.0.7","product":{"name":"Linux Linux 7.0.7","product_id":"CSAFPID-19","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:4.10:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"7.1-rc2","product":{"name":"Linux Linux 7.1-rc2","product_id":"CSAFPID-20","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:4.10:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-46304","title":"nvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free","notes":[{"category":"description","text":"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->async_event_work on\nthe same nvmet-wq.\n\nCall chain:\n\n nvmet_tcp_schedule_release_queue()\n kref_put(&queue->kref, nvmet_tcp_release_queue)\n nvmet_tcp_release_queue()\n queue_work(nvmet_wq, &queue->release_work) <--- nvmet_wq\n process_one_work()\n nvmet_tcp_release_queue_work()\n nvmet_cq_put(&queue->nvme_cq)\n nvmet_cq_destroy()\n nvmet_ctrl_put(cq->ctrl)\n nvmet_ctrl_free()\n flush_work(&ctrl->async_event_work) <--- nvmet_wq\n\n Previously Scheduled by :-\n\t\t nvmet_add_async_event\n\t\t queue_work(nvmet_wq, &ctrl->async_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)(&queue->release_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] \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---","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6","CSAFPID-7","CSAFPID-8","CSAFPID-9","CSAFPID-10","CSAFPID-11"],"fixed":["CSAFPID-12","CSAFPID-13","CSAFPID-14","CSAFPID-15","CSAFPID-16","CSAFPID-17","CSAFPID-18","CSAFPID-19","CSAFPID-20"]},"scores":[{"cvss_v3":{"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"},"products":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6","CSAFPID-7","CSAFPID-8","CSAFPID-9","CSAFPID-10","CSAFPID-11"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 0, 4.10, 5.10.258, 5.15.209, 551f445a56a11a6457550cddcf39c9ebb8bcacc6, 6.1.175, 6.6.140, 6.12.88, 6.18.30, 7.0.7, 7.1-rc2, 781f47d641432c26c19625b2cdd7f40825097592, 8d66ba89480ff098a58d79003a505f383aa4e920, 9a4d7222c0955b221e38bb66d10e6bccb672c8a1, a696fbbd5240b4ac9b166f7bd4c550882ff543f1, aade8abd8b868b6ffa9697aadaea28ec7f65bee6, ae5b0cad163833e10b271e9becc05d81dae56e5f, ee6e20c4bc9eae542a0954a368449532383169d4.","product_ids":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6","CSAFPID-7","CSAFPID-8","CSAFPID-9","CSAFPID-10","CSAFPID-11"]}]}]}