CVE-2026-23167 (GCVE-0-2026-23167)

Vulnerability from cvelistv5 – Published: 2026-02-14 16:01 – Updated: 2026-02-14 16:01
VLAI?
Title
nfc: nci: Fix race between rfkill and nci_unregister_device().
Summary
In the Linux kernel, the following vulnerability has been resolved: nfc: nci: Fix race between rfkill and nci_unregister_device(). syzbot reported the splat below [0] without a repro. It indicates that struct nci_dev.cmd_wq had been destroyed before nci_close_device() was called via rfkill. nci_dev.cmd_wq is only destroyed in nci_unregister_device(), which (I think) was called from virtual_ncidev_close() when syzbot close()d an fd of virtual_ncidev. The problem is that nci_unregister_device() destroys nci_dev.cmd_wq first and then calls nfc_unregister_device(), which removes the device from rfkill by rfkill_unregister(). So, the device is still visible via rfkill even after nci_dev.cmd_wq is destroyed. Let's unregister the device from rfkill first in nci_unregister_device(). Note that we cannot call nfc_unregister_device() before nci_close_device() because 1) nfc_unregister_device() calls device_del() which frees all memory allocated by devm_kzalloc() and linked to ndev->conn_info_list 2) nci_rx_work() could try to queue nci_conn_info to ndev->conn_info_list which could be leaked Thus, nfc_unregister_device() is split into two functions so we can remove rfkill interfaces only before nci_close_device(). [0]: DEBUG_LOCKS_WARN_ON(1) WARNING: kernel/locking/lockdep.c:238 at hlock_class kernel/locking/lockdep.c:238 [inline], CPU#0: syz.0.8675/6349 WARNING: kernel/locking/lockdep.c:238 at check_wait_context kernel/locking/lockdep.c:4854 [inline], CPU#0: syz.0.8675/6349 WARNING: kernel/locking/lockdep.c:238 at __lock_acquire+0x39d/0x2cf0 kernel/locking/lockdep.c:5187, CPU#0: syz.0.8675/6349 Modules linked in: CPU: 0 UID: 0 PID: 6349 Comm: syz.0.8675 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 RIP: 0010:hlock_class kernel/locking/lockdep.c:238 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4854 [inline] RIP: 0010:__lock_acquire+0x3a4/0x2cf0 kernel/locking/lockdep.c:5187 Code: 18 00 4c 8b 74 24 08 75 27 90 e8 17 f2 fc 02 85 c0 74 1c 83 3d 50 e0 4e 0e 00 75 13 48 8d 3d 43 f7 51 0e 48 c7 c6 8b 3a de 8d <67> 48 0f b9 3a 90 31 c0 0f b6 98 c4 00 00 00 41 8b 45 20 25 ff 1f RSP: 0018:ffffc9000c767680 EFLAGS: 00010046 RAX: 0000000000000001 RBX: 0000000000040000 RCX: 0000000000080000 RDX: ffffc90013080000 RSI: ffffffff8dde3a8b RDI: ffffffff8ff24ca0 RBP: 0000000000000003 R08: ffffffff8fef35a3 R09: 1ffffffff1fde6b4 R10: dffffc0000000000 R11: fffffbfff1fde6b5 R12: 00000000000012a2 R13: ffff888030338ba8 R14: ffff888030338000 R15: ffff888030338b30 FS: 00007fa5995f66c0(0000) GS:ffff8881256f8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7e72f842d0 CR3: 00000000485a0000 CR4: 00000000003526f0 Call Trace: <TASK> lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868 touch_wq_lockdep_map+0xcb/0x180 kernel/workqueue.c:3940 __flush_workqueue+0x14b/0x14f0 kernel/workqueue.c:3982 nci_close_device+0x302/0x630 net/nfc/nci/core.c:567 nci_dev_down+0x3b/0x50 net/nfc/nci/core.c:639 nfc_dev_down+0x152/0x290 net/nfc/core.c:161 nfc_rfkill_set_block+0x2d/0x100 net/nfc/core.c:179 rfkill_set_block+0x1d2/0x440 net/rfkill/core.c:346 rfkill_fop_write+0x461/0x5a0 net/rfkill/core.c:1301 vfs_write+0x29a/0xb90 fs/read_write.c:684 ksys_write+0x150/0x270 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa59b39acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa5995f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fa59b615fa0 RCX: 00007fa59b39acb9 RDX: 0000000000000008 RSI: 0000200000000080 RDI: 0000000000000007 RBP: 00007fa59b408bf7 R08: ---truncated---
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6a2968aaf50c7a22fced77a5e24aa636281efca8 , < cd4412d5905ee580e96c48360dc98fcd9e6f3208 (git)
Affected: 6a2968aaf50c7a22fced77a5e24aa636281efca8 , < eaa5da5130deda26420273d4610cf6e4f794ed75 (git)
Affected: 6a2968aaf50c7a22fced77a5e24aa636281efca8 , < 8ea4d96419fb20f15a52ce657d49f1e7c91eb7ac (git)
Affected: 6a2968aaf50c7a22fced77a5e24aa636281efca8 , < 546eba0b10989de9ccc7fd619e874a30561e2b88 (git)
Affected: 6a2968aaf50c7a22fced77a5e24aa636281efca8 , < 126cd30cad37bc7c2c85fe2df2a522d4edf0a5c5 (git)
Affected: 6a2968aaf50c7a22fced77a5e24aa636281efca8 , < c3369fc5e6120a72169e71acd72e987907a682af (git)
Affected: 6a2968aaf50c7a22fced77a5e24aa636281efca8 , < d2492688bb9fed6ab6e313682c387ae71a66ebae (git)
Create a notification for this product.
    Linux Linux Affected: 3.2
Unaffected: 0 , < 3.2 (semver)
Unaffected: 5.10.249 , ≤ 5.10.* (semver)
Unaffected: 5.15.199 , ≤ 5.15.* (semver)
Unaffected: 6.1.162 , ≤ 6.1.* (semver)
Unaffected: 6.6.123 , ≤ 6.6.* (semver)
Unaffected: 6.12.69 , ≤ 6.12.* (semver)
Unaffected: 6.18.9 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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{
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          "product": "Linux",
          "programFiles": [
            "include/net/nfc/nfc.h",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.15.199",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.162",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.123",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.69",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: nci: Fix race between rfkill and nci_unregister_device().\n\nsyzbot reported the splat below [0] without a repro.\n\nIt indicates that struct nci_dev.cmd_wq had been destroyed before\nnci_close_device() was called via rfkill.\n\nnci_dev.cmd_wq is only destroyed in nci_unregister_device(), which\n(I think) was called from virtual_ncidev_close() when syzbot close()d\nan fd of virtual_ncidev.\n\nThe problem is that nci_unregister_device() destroys nci_dev.cmd_wq\nfirst and then calls nfc_unregister_device(), which removes the\ndevice from rfkill by rfkill_unregister().\n\nSo, the device is still visible via rfkill even after nci_dev.cmd_wq\nis destroyed.\n\nLet\u0027s unregister the device from rfkill first in nci_unregister_device().\n\nNote that we cannot call nfc_unregister_device() before\nnci_close_device() because\n\n  1) nfc_unregister_device() calls device_del() which frees\n     all memory allocated by devm_kzalloc() and linked to\n     ndev-\u003econn_info_list\n\n  2) nci_rx_work() could try to queue nci_conn_info to\n     ndev-\u003econn_info_list which could be leaked\n\nThus, nfc_unregister_device() is split into two functions so we\ncan remove rfkill interfaces only before nci_close_device().\n\n[0]:\nDEBUG_LOCKS_WARN_ON(1)\nWARNING: kernel/locking/lockdep.c:238 at hlock_class kernel/locking/lockdep.c:238 [inline], CPU#0: syz.0.8675/6349\nWARNING: kernel/locking/lockdep.c:238 at check_wait_context kernel/locking/lockdep.c:4854 [inline], CPU#0: syz.0.8675/6349\nWARNING: kernel/locking/lockdep.c:238 at __lock_acquire+0x39d/0x2cf0 kernel/locking/lockdep.c:5187, CPU#0: syz.0.8675/6349\nModules linked in:\nCPU: 0 UID: 0 PID: 6349 Comm: syz.0.8675 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026\nRIP: 0010:hlock_class kernel/locking/lockdep.c:238 [inline]\nRIP: 0010:check_wait_context kernel/locking/lockdep.c:4854 [inline]\nRIP: 0010:__lock_acquire+0x3a4/0x2cf0 kernel/locking/lockdep.c:5187\nCode: 18 00 4c 8b 74 24 08 75 27 90 e8 17 f2 fc 02 85 c0 74 1c 83 3d 50 e0 4e 0e 00 75 13 48 8d 3d 43 f7 51 0e 48 c7 c6 8b 3a de 8d \u003c67\u003e 48 0f b9 3a 90 31 c0 0f b6 98 c4 00 00 00 41 8b 45 20 25 ff 1f\nRSP: 0018:ffffc9000c767680 EFLAGS: 00010046\nRAX: 0000000000000001 RBX: 0000000000040000 RCX: 0000000000080000\nRDX: ffffc90013080000 RSI: ffffffff8dde3a8b RDI: ffffffff8ff24ca0\nRBP: 0000000000000003 R08: ffffffff8fef35a3 R09: 1ffffffff1fde6b4\nR10: dffffc0000000000 R11: fffffbfff1fde6b5 R12: 00000000000012a2\nR13: ffff888030338ba8 R14: ffff888030338000 R15: ffff888030338b30\nFS:  00007fa5995f66c0(0000) GS:ffff8881256f8000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f7e72f842d0 CR3: 00000000485a0000 CR4: 00000000003526f0\nCall Trace:\n \u003cTASK\u003e\n lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868\n touch_wq_lockdep_map+0xcb/0x180 kernel/workqueue.c:3940\n __flush_workqueue+0x14b/0x14f0 kernel/workqueue.c:3982\n nci_close_device+0x302/0x630 net/nfc/nci/core.c:567\n nci_dev_down+0x3b/0x50 net/nfc/nci/core.c:639\n nfc_dev_down+0x152/0x290 net/nfc/core.c:161\n nfc_rfkill_set_block+0x2d/0x100 net/nfc/core.c:179\n rfkill_set_block+0x1d2/0x440 net/rfkill/core.c:346\n rfkill_fop_write+0x461/0x5a0 net/rfkill/core.c:1301\n vfs_write+0x29a/0xb90 fs/read_write.c:684\n ksys_write+0x150/0x270 fs/read_write.c:738\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7fa59b39acb9\nCode: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007fa5995f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001\nRAX: ffffffffffffffda RBX: 00007fa59b615fa0 RCX: 00007fa59b39acb9\nRDX: 0000000000000008 RSI: 0000200000000080 RDI: 0000000000000007\nRBP: 00007fa59b408bf7 R08: \n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-14T16:01:30.755Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cd4412d5905ee580e96c48360dc98fcd9e6f3208"
        },
        {
          "url": "https://git.kernel.org/stable/c/eaa5da5130deda26420273d4610cf6e4f794ed75"
        },
        {
          "url": "https://git.kernel.org/stable/c/8ea4d96419fb20f15a52ce657d49f1e7c91eb7ac"
        },
        {
          "url": "https://git.kernel.org/stable/c/546eba0b10989de9ccc7fd619e874a30561e2b88"
        },
        {
          "url": "https://git.kernel.org/stable/c/126cd30cad37bc7c2c85fe2df2a522d4edf0a5c5"
        },
        {
          "url": "https://git.kernel.org/stable/c/c3369fc5e6120a72169e71acd72e987907a682af"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2492688bb9fed6ab6e313682c387ae71a66ebae"
        }
      ],
      "title": "nfc: nci: Fix race between rfkill and nci_unregister_device().",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23167",
    "datePublished": "2026-02-14T16:01:30.755Z",
    "dateReserved": "2026-01-13T15:37:45.981Z",
    "dateUpdated": "2026-02-14T16:01:30.755Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23167\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-02-14T16:15:56.910\",\"lastModified\":\"2026-02-14T16:15:56.910\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnfc: nci: Fix race between rfkill and nci_unregister_device().\\n\\nsyzbot reported the splat below [0] without a repro.\\n\\nIt indicates that struct nci_dev.cmd_wq had been destroyed before\\nnci_close_device() was called via rfkill.\\n\\nnci_dev.cmd_wq is only destroyed in nci_unregister_device(), which\\n(I think) was called from virtual_ncidev_close() when syzbot close()d\\nan fd of virtual_ncidev.\\n\\nThe problem is that nci_unregister_device() destroys nci_dev.cmd_wq\\nfirst and then calls nfc_unregister_device(), which removes the\\ndevice from rfkill by rfkill_unregister().\\n\\nSo, the device is still visible via rfkill even after nci_dev.cmd_wq\\nis destroyed.\\n\\nLet\u0027s unregister the device from rfkill first in nci_unregister_device().\\n\\nNote that we cannot call nfc_unregister_device() before\\nnci_close_device() because\\n\\n  1) nfc_unregister_device() calls device_del() which frees\\n     all memory allocated by devm_kzalloc() and linked to\\n     ndev-\u003econn_info_list\\n\\n  2) nci_rx_work() could try to queue nci_conn_info to\\n     ndev-\u003econn_info_list which could be leaked\\n\\nThus, nfc_unregister_device() is split into two functions so we\\ncan remove rfkill interfaces only before nci_close_device().\\n\\n[0]:\\nDEBUG_LOCKS_WARN_ON(1)\\nWARNING: kernel/locking/lockdep.c:238 at hlock_class kernel/locking/lockdep.c:238 [inline], CPU#0: syz.0.8675/6349\\nWARNING: kernel/locking/lockdep.c:238 at check_wait_context kernel/locking/lockdep.c:4854 [inline], CPU#0: syz.0.8675/6349\\nWARNING: kernel/locking/lockdep.c:238 at __lock_acquire+0x39d/0x2cf0 kernel/locking/lockdep.c:5187, CPU#0: syz.0.8675/6349\\nModules linked in:\\nCPU: 0 UID: 0 PID: 6349 Comm: syz.0.8675 Not tainted syzkaller #0 PREEMPT(full)\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026\\nRIP: 0010:hlock_class kernel/locking/lockdep.c:238 [inline]\\nRIP: 0010:check_wait_context kernel/locking/lockdep.c:4854 [inline]\\nRIP: 0010:__lock_acquire+0x3a4/0x2cf0 kernel/locking/lockdep.c:5187\\nCode: 18 00 4c 8b 74 24 08 75 27 90 e8 17 f2 fc 02 85 c0 74 1c 83 3d 50 e0 4e 0e 00 75 13 48 8d 3d 43 f7 51 0e 48 c7 c6 8b 3a de 8d \u003c67\u003e 48 0f b9 3a 90 31 c0 0f b6 98 c4 00 00 00 41 8b 45 20 25 ff 1f\\nRSP: 0018:ffffc9000c767680 EFLAGS: 00010046\\nRAX: 0000000000000001 RBX: 0000000000040000 RCX: 0000000000080000\\nRDX: ffffc90013080000 RSI: ffffffff8dde3a8b RDI: ffffffff8ff24ca0\\nRBP: 0000000000000003 R08: ffffffff8fef35a3 R09: 1ffffffff1fde6b4\\nR10: dffffc0000000000 R11: fffffbfff1fde6b5 R12: 00000000000012a2\\nR13: ffff888030338ba8 R14: ffff888030338000 R15: ffff888030338b30\\nFS:  00007fa5995f66c0(0000) GS:ffff8881256f8000(0000) knlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 00007f7e72f842d0 CR3: 00000000485a0000 CR4: 00000000003526f0\\nCall Trace:\\n \u003cTASK\u003e\\n lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868\\n touch_wq_lockdep_map+0xcb/0x180 kernel/workqueue.c:3940\\n __flush_workqueue+0x14b/0x14f0 kernel/workqueue.c:3982\\n nci_close_device+0x302/0x630 net/nfc/nci/core.c:567\\n nci_dev_down+0x3b/0x50 net/nfc/nci/core.c:639\\n nfc_dev_down+0x152/0x290 net/nfc/core.c:161\\n nfc_rfkill_set_block+0x2d/0x100 net/nfc/core.c:179\\n rfkill_set_block+0x1d2/0x440 net/rfkill/core.c:346\\n rfkill_fop_write+0x461/0x5a0 net/rfkill/core.c:1301\\n vfs_write+0x29a/0xb90 fs/read_write.c:684\\n ksys_write+0x150/0x270 fs/read_write.c:738\\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\\n do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\nRIP: 0033:0x7fa59b39acb9\\nCode: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48\\nRSP: 002b:00007fa5995f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001\\nRAX: ffffffffffffffda RBX: 00007fa59b615fa0 RCX: 00007fa59b39acb9\\nRDX: 0000000000000008 RSI: 0000200000000080 RDI: 0000000000000007\\nRBP: 00007fa59b408bf7 R08: \\n---truncated---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/126cd30cad37bc7c2c85fe2df2a522d4edf0a5c5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/546eba0b10989de9ccc7fd619e874a30561e2b88\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8ea4d96419fb20f15a52ce657d49f1e7c91eb7ac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c3369fc5e6120a72169e71acd72e987907a682af\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cd4412d5905ee580e96c48360dc98fcd9e6f3208\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d2492688bb9fed6ab6e313682c387ae71a66ebae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eaa5da5130deda26420273d4610cf6e4f794ed75\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.