{"id":"CVE-2026-46304","revision":"12a8c837018f47c7af9705df0aaf936e","records":[{"revision":"12a8c837018f47c7af9705df0aaf936e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-46304","aliases":[],"title":"nvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free","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->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---","state":0,"publishedAt":"2026-06-08T15:46:31.747+00:00","modifiedAt":"2026-10-19T19:36:57.215+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/nvme/target/core.c\"\n ],\n \"versions\": [\n {\n \"version\": \"06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5\",\n \"lessThan\": \"ae5b0cad163833e10b271e9becc05d81dae56e5f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5\",\n \"lessThan\": \"8d66ba89480ff098a58d79003a505f383aa4e920\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5\",\n \"lessThan\": \"a696fbbd5240b4ac9b166f7bd4c550882ff543f1\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5\",\n \"lessThan\": \"9a4d7222c0955b221e38bb66d10e6bccb672c8a1\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5\",\n \"lessThan\": \"ee6e20c4bc9eae542a0954a368449532383169d4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5\",\n \"lessThan\": \"781f47d641432c26c19625b2cdd7f40825097592\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5\",\n \"lessThan\": \"551f445a56a11a6457550cddcf39c9ebb8bcacc6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5\",\n \"lessThan\": \"aade8abd8b868b6ffa9697aadaea28ec7f65bee6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3976dd677e891c0b2c63d08028d445663539472c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"4.9.68\",\n \"lessThan\": \"4.10\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/nvme/target/core.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.10\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.10\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.258\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.209\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.175\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.140\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.88\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.30\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.7\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/ae5b0cad163833e10b271e9becc05d81dae56e5f","https://git.kernel.org/stable/c/8d66ba89480ff098a58d79003a505f383aa4e920","https://git.kernel.org/stable/c/a696fbbd5240b4ac9b166f7bd4c550882ff543f1","https://git.kernel.org/stable/c/9a4d7222c0955b221e38bb66d10e6bccb672c8a1","https://git.kernel.org/stable/c/ee6e20c4bc9eae542a0954a368449532383169d4","https://git.kernel.org/stable/c/781f47d641432c26c19625b2cdd7f40825097592","https://git.kernel.org/stable/c/551f445a56a11a6457550cddcf39c9ebb8bcacc6","https://git.kernel.org/stable/c/aade8abd8b868b6ffa9697aadaea28ec7f65bee6"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-46304","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-46304","identifiers":["CVE-2026-46304"]},"retained":false,"historicalAffected":[]}],"coverage":[]}