{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-46304", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-46304", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-06-08T15:46:31.747Z", "updatedAt": "2026-10-19T19:36:57.215Z", "importedAt": "2026-10-24T01:58:14.884Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "nvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free", "summary": "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---", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5", "status": "affected", "versionType": "git", "lessThan": "ae5b0cad163833e10b271e9becc05d81dae56e5f" }, { "version": "06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5", "status": "affected", "versionType": "git", "lessThan": "8d66ba89480ff098a58d79003a505f383aa4e920" }, { "version": "06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5", "status": "affected", "versionType": "git", "lessThan": "a696fbbd5240b4ac9b166f7bd4c550882ff543f1" }, { "version": "06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5", "status": "affected", "versionType": "git", "lessThan": "9a4d7222c0955b221e38bb66d10e6bccb672c8a1" }, { "version": "06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5", "status": "affected", "versionType": "git", "lessThan": "ee6e20c4bc9eae542a0954a368449532383169d4" }, { "version": "06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5", "status": "affected", "versionType": "git", "lessThan": "781f47d641432c26c19625b2cdd7f40825097592" }, { "version": "06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5", "status": "affected", "versionType": "git", "lessThan": "551f445a56a11a6457550cddcf39c9ebb8bcacc6" }, { "version": "06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5", "status": "affected", "versionType": "git", "lessThan": "aade8abd8b868b6ffa9697aadaea28ec7f65bee6" }, { "version": "3976dd677e891c0b2c63d08028d445663539472c", "status": "affected", "versionType": "git" }, { "version": "4.9.68", "status": "affected", "versionType": "semver", "lessThan": "4.10" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.10", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.10" }, { "version": "5.10.258", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.209", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.175", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.140", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.88", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.30", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.0.7", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.0.*" }, { "version": "7.1", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }