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CVE-2022-49505 (GCVE-0-2022-49505)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:13 – Updated: 2026-08-05 08:55
VLAI
Title
NFC: NULL out the dev->rfkill to prevent UAF
Summary
In the Linux kernel, the following vulnerability has been resolved: NFC: NULL out the dev->rfkill to prevent UAF Commit 3e3b5dfcd16a ("NFC: reorder the logic in nfc_{un,}register_device") assumes the device_is_registered() in function nfc_dev_up() will help to check when the rfkill is unregistered. However, this check only take effect when device_del(&dev->dev) is done in nfc_unregister_device(). Hence, the rfkill object is still possible be dereferenced. The crash trace in latest kernel (5.18-rc2): [ 68.760105] ================================================================== [ 68.760330] BUG: KASAN: use-after-free in __lock_acquire+0x3ec1/0x6750 [ 68.760756] Read of size 8 at addr ffff888009c93018 by task fuzz/313 [ 68.760756] [ 68.760756] CPU: 0 PID: 313 Comm: fuzz Not tainted 5.18.0-rc2 #4 [ 68.760756] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 68.760756] Call Trace: [ 68.760756] <TASK> [ 68.760756] dump_stack_lvl+0x57/0x7d [ 68.760756] print_report.cold+0x5e/0x5db [ 68.760756] ? __lock_acquire+0x3ec1/0x6750 [ 68.760756] kasan_report+0xbe/0x1c0 [ 68.760756] ? __lock_acquire+0x3ec1/0x6750 [ 68.760756] __lock_acquire+0x3ec1/0x6750 [ 68.760756] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 68.760756] ? register_lock_class+0x18d0/0x18d0 [ 68.760756] lock_acquire+0x1ac/0x4f0 [ 68.760756] ? rfkill_blocked+0xe/0x60 [ 68.760756] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 68.760756] ? mutex_lock_io_nested+0x12c0/0x12c0 [ 68.760756] ? nla_get_range_signed+0x540/0x540 [ 68.760756] ? _raw_spin_lock_irqsave+0x4e/0x50 [ 68.760756] _raw_spin_lock_irqsave+0x39/0x50 [ 68.760756] ? rfkill_blocked+0xe/0x60 [ 68.760756] rfkill_blocked+0xe/0x60 [ 68.760756] nfc_dev_up+0x84/0x260 [ 68.760756] nfc_genl_dev_up+0x90/0xe0 [ 68.760756] genl_family_rcv_msg_doit+0x1f4/0x2f0 [ 68.760756] ? genl_family_rcv_msg_attrs_parse.constprop.0+0x230/0x230 [ 68.760756] ? security_capable+0x51/0x90 [ 68.760756] genl_rcv_msg+0x280/0x500 [ 68.760756] ? genl_get_cmd+0x3c0/0x3c0 [ 68.760756] ? lock_acquire+0x1ac/0x4f0 [ 68.760756] ? nfc_genl_dev_down+0xe0/0xe0 [ 68.760756] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 68.760756] netlink_rcv_skb+0x11b/0x340 [ 68.760756] ? genl_get_cmd+0x3c0/0x3c0 [ 68.760756] ? netlink_ack+0x9c0/0x9c0 [ 68.760756] ? netlink_deliver_tap+0x136/0xb00 [ 68.760756] genl_rcv+0x1f/0x30 [ 68.760756] netlink_unicast+0x430/0x710 [ 68.760756] ? memset+0x20/0x40 [ 68.760756] ? netlink_attachskb+0x740/0x740 [ 68.760756] ? __build_skb_around+0x1f4/0x2a0 [ 68.760756] netlink_sendmsg+0x75d/0xc00 [ 68.760756] ? netlink_unicast+0x710/0x710 [ 68.760756] ? netlink_unicast+0x710/0x710 [ 68.760756] sock_sendmsg+0xdf/0x110 [ 68.760756] __sys_sendto+0x19e/0x270 [ 68.760756] ? __ia32_sys_getpeername+0xa0/0xa0 [ 68.760756] ? fd_install+0x178/0x4c0 [ 68.760756] ? fd_install+0x195/0x4c0 [ 68.760756] ? kernel_fpu_begin_mask+0x1c0/0x1c0 [ 68.760756] __x64_sys_sendto+0xd8/0x1b0 [ 68.760756] ? lockdep_hardirqs_on+0xbf/0x130 [ 68.760756] ? syscall_enter_from_user_mode+0x1d/0x50 [ 68.760756] do_syscall_64+0x3b/0x90 [ 68.760756] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 68.760756] RIP: 0033:0x7f67fb50e6b3 ... [ 68.760756] RSP: 002b:00007f67fa91fe90 EFLAGS: 00000293 ORIG_RAX: 000000000000002c [ 68.760756] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f67fb50e6b3 [ 68.760756] RDX: 000000000000001c RSI: 0000559354603090 RDI: 0000000000000003 [ 68.760756] RBP: 00007f67fa91ff00 R08: 00007f67fa91fedc R09: 000000000000000c [ 68.760756] R10: 0000000000000000 R11: 0000000000000293 R12: 00007ffe824d496e [ 68.760756] R13: 00007ffe824d496f R14: 00007f67fa120000 R15: 0000000000000003 [ 68.760756] </TASK> [ 68.760756] [ 68.760756] Allocated by task 279: [ 68.760756] kasan_save_stack+0x1e/0x40 [ ---truncated---
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-27 17:58 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ff169909eac9e00bf1aa0af739ba6ddfb1b1d135 , < a8e03bcad52dc9afabf650fdbad84f739cec9efa (git)
Affected: 47244ac0b65bd74cc70007d8e1bac68bd2baad19 , < f81270125b50532624400063281e6611ecd61ddf (git)
Affected: c45cea83e13699bdfd47842e04d09dd43af4c371 , < 6abfaca8711803d0d7cc8c0fac1070a88509d463 (git)
Affected: 307d2e6cebfca9d92f86c8e2c8e3dd4a8be46ba6 , < fbf9c4c714d3cdeb98b6a18e4d057f931cad1d81 (git)
Affected: 73a0d12114b4bc1a9def79a623264754b9df698e , < 2a1b5110c95e4d49c8c3906270dfcde680a5a7be (git)
Affected: 8a9c61c3ef187d8891225f9b932390670a43a0d3 , < 1632be63862f183cd5cf1cc094e698e6ec005dfd (git)
Affected: 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 , < 4a68938f43b7c2663e4c90bb9bbe29ac8b9a42a0 (git)
Affected: 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 , < 4f5d71930f41be78557f9714393179025baacd65 (git)
Affected: 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 , < 1b0e81416a24d6e9b8c2341e22e8bf48f8b8bfc9 (git)
Affected: 5ef16d2d172ee56714cff37cd005b98aba08ef5a (git)
Affected: 4.9.291 , < 4.9.318 (semver)
Affected: 4.14.256 , < 4.14.283 (semver)
Affected: 4.19.218 , < 4.19.247 (semver)
Affected: 5.4.162 , < 5.4.198 (semver)
Affected: 5.10.82 , < 5.10.121 (semver)
Affected: 5.15.5 , < 5.15.46 (semver)
Affected: 4.4.293 , < 4.5 (semver)
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Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 4.9.318 , ≤ 4.9.* (semver)
Unaffected: 4.14.283 , ≤ 4.14.* (semver)
Unaffected: 4.19.247 , ≤ 4.19.* (semver)
Unaffected: 5.4.198 , ≤ 5.4.* (semver)
Unaffected: 5.10.121 , ≤ 5.10.* (semver)
Unaffected: 5.15.46 , ≤ 5.15.* (semver)
Unaffected: 5.17.14 , ≤ 5.17.* (semver)
Unaffected: 5.18.3 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFC: NULL out the dev-\u003erfkill to prevent UAF\n\nCommit 3e3b5dfcd16a (\"NFC: reorder the logic in nfc_{un,}register_device\")\nassumes the device_is_registered() in function nfc_dev_up() will help\nto check when the rfkill is unregistered. However, this check only\ntake effect when device_del(\u0026dev-\u003edev) is done in nfc_unregister_device().\nHence, the rfkill object is still possible be dereferenced.\n\nThe crash trace in latest kernel (5.18-rc2):\n\n[   68.760105] ==================================================================\n[   68.760330] BUG: KASAN: use-after-free in __lock_acquire+0x3ec1/0x6750\n[   68.760756] Read of size 8 at addr ffff888009c93018 by task fuzz/313\n[   68.760756]\n[   68.760756] CPU: 0 PID: 313 Comm: fuzz Not tainted 5.18.0-rc2 #4\n[   68.760756] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\n[   68.760756] Call Trace:\n[   68.760756]  \u003cTASK\u003e\n[   68.760756]  dump_stack_lvl+0x57/0x7d\n[   68.760756]  print_report.cold+0x5e/0x5db\n[   68.760756]  ? __lock_acquire+0x3ec1/0x6750\n[   68.760756]  kasan_report+0xbe/0x1c0\n[   68.760756]  ? __lock_acquire+0x3ec1/0x6750\n[   68.760756]  __lock_acquire+0x3ec1/0x6750\n[   68.760756]  ? lockdep_hardirqs_on_prepare+0x410/0x410\n[   68.760756]  ? register_lock_class+0x18d0/0x18d0\n[   68.760756]  lock_acquire+0x1ac/0x4f0\n[   68.760756]  ? rfkill_blocked+0xe/0x60\n[   68.760756]  ? lockdep_hardirqs_on_prepare+0x410/0x410\n[   68.760756]  ? mutex_lock_io_nested+0x12c0/0x12c0\n[   68.760756]  ? nla_get_range_signed+0x540/0x540\n[   68.760756]  ? _raw_spin_lock_irqsave+0x4e/0x50\n[   68.760756]  _raw_spin_lock_irqsave+0x39/0x50\n[   68.760756]  ? rfkill_blocked+0xe/0x60\n[   68.760756]  rfkill_blocked+0xe/0x60\n[   68.760756]  nfc_dev_up+0x84/0x260\n[   68.760756]  nfc_genl_dev_up+0x90/0xe0\n[   68.760756]  genl_family_rcv_msg_doit+0x1f4/0x2f0\n[   68.760756]  ? genl_family_rcv_msg_attrs_parse.constprop.0+0x230/0x230\n[   68.760756]  ? security_capable+0x51/0x90\n[   68.760756]  genl_rcv_msg+0x280/0x500\n[   68.760756]  ? genl_get_cmd+0x3c0/0x3c0\n[   68.760756]  ? lock_acquire+0x1ac/0x4f0\n[   68.760756]  ? nfc_genl_dev_down+0xe0/0xe0\n[   68.760756]  ? lockdep_hardirqs_on_prepare+0x410/0x410\n[   68.760756]  netlink_rcv_skb+0x11b/0x340\n[   68.760756]  ? genl_get_cmd+0x3c0/0x3c0\n[   68.760756]  ? netlink_ack+0x9c0/0x9c0\n[   68.760756]  ? netlink_deliver_tap+0x136/0xb00\n[   68.760756]  genl_rcv+0x1f/0x30\n[   68.760756]  netlink_unicast+0x430/0x710\n[   68.760756]  ? memset+0x20/0x40\n[   68.760756]  ? netlink_attachskb+0x740/0x740\n[   68.760756]  ? __build_skb_around+0x1f4/0x2a0\n[   68.760756]  netlink_sendmsg+0x75d/0xc00\n[   68.760756]  ? netlink_unicast+0x710/0x710\n[   68.760756]  ? netlink_unicast+0x710/0x710\n[   68.760756]  sock_sendmsg+0xdf/0x110\n[   68.760756]  __sys_sendto+0x19e/0x270\n[   68.760756]  ? __ia32_sys_getpeername+0xa0/0xa0\n[   68.760756]  ? fd_install+0x178/0x4c0\n[   68.760756]  ? fd_install+0x195/0x4c0\n[   68.760756]  ? kernel_fpu_begin_mask+0x1c0/0x1c0\n[   68.760756]  __x64_sys_sendto+0xd8/0x1b0\n[   68.760756]  ? lockdep_hardirqs_on+0xbf/0x130\n[   68.760756]  ? syscall_enter_from_user_mode+0x1d/0x50\n[   68.760756]  do_syscall_64+0x3b/0x90\n[   68.760756]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n[   68.760756] RIP: 0033:0x7f67fb50e6b3\n...\n[   68.760756] RSP: 002b:00007f67fa91fe90 EFLAGS: 00000293 ORIG_RAX: 000000000000002c\n[   68.760756] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f67fb50e6b3\n[   68.760756] RDX: 000000000000001c RSI: 0000559354603090 RDI: 0000000000000003\n[   68.760756] RBP: 00007f67fa91ff00 R08: 00007f67fa91fedc R09: 000000000000000c\n[   68.760756] R10: 0000000000000000 R11: 0000000000000293 R12: 00007ffe824d496e\n[   68.760756] R13: 00007ffe824d496f R14: 00007f67fa120000 R15: 0000000000000003\n\n[   68.760756]  \u003c/TASK\u003e\n[   68.760756]\n[   68.760756] Allocated by task 279:\n[   68.760756]  kasan_save_stack+0x1e/0x40\n[\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The UAF is reached via local netlink (NFC_CMD_DEV_UP \u2192 nfc_genl_dev_up \u2192 nfc_dev_up) raced with local device teardown (TTY N_NCI close / nfc_unregister_device), not via NFC radio frames or remote packet processing.\nAC:L - The attacker controls both sides of the race\u2014creating/destroying an NFC device (e.g. N_NCI on a PTY with nfcmrvl) while issuing concurrent NFC_CMD_DEV_UP\u2014and the window between rfkill_destroy and device_del includes sleeping work (llcp unregister, timers), so the race is reliably repeatable.\nPR:L - Unprivileged users can attach N_NCI and register/unregister NFC devices with no capability check on the TTY path; NFC_CMD_DEV_UP uses GENL_ADMIN_PERM, but on NFC-enabled systems a management daemon performs DEV_UP, and when uncertain between PR:L and PR:H the higher-severity Low is chosen.\nUI:N - The attacker drives device create/teardown and DEV_UP (directly or via racing an always-on NFC service) without any separate victim action such as mounting a filesystem or opening a user file.\nS:U - Impact is host-kernel heap UAF within the same OS security authority; this is standard local privilege escalation, not a VM escape, IOMMU/DMA bypass, or sandbox boundary cross.\nC:H - rfkill_blocked() operates on a freed struct rfkill (spinlock/state); classic UAF reclaim/heap spray yields arbitrary kernel read primitives, scored Confidentiality High per UAF guidance.\nI:H - The same freed rfkill object can be reallocated and corrupted before rfkill_blocked() runs, enabling heap write and control-flow hijack primitives, scored Integrity High per UAF guidance.\nA:H - KASAN already demonstrates a use-after-free crash in rfkill_blocked/nfc_dev_up; even without full exploitation this produces a kernel oops/panic (Availability High)."
            }
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        "dateUpdated": "2026-08-05T08:55:23.598Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/a8e03bcad52dc9afabf650fdbad84f739cec9efa"
        },
        {
          "url": "https://git.kernel.org/stable/c/f81270125b50532624400063281e6611ecd61ddf"
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          "url": "https://git.kernel.org/stable/c/6abfaca8711803d0d7cc8c0fac1070a88509d463"
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          "url": "https://git.kernel.org/stable/c/fbf9c4c714d3cdeb98b6a18e4d057f931cad1d81"
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          "url": "https://git.kernel.org/stable/c/2a1b5110c95e4d49c8c3906270dfcde680a5a7be"
        },
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          "url": "https://git.kernel.org/stable/c/1632be63862f183cd5cf1cc094e698e6ec005dfd"
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          "url": "https://git.kernel.org/stable/c/4f5d71930f41be78557f9714393179025baacd65"
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          "url": "https://git.kernel.org/stable/c/1b0e81416a24d6e9b8c2341e22e8bf48f8b8bfc9"
        }
      ],
      "title": "NFC: NULL out the dev-\u003erfkill to prevent UAF",
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    "datePublished": "2025-02-26T02:13:37.496Z",
    "dateReserved": "2025-02-26T02:08:31.586Z",
    "dateUpdated": "2026-08-05T08:55:23.598Z",
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          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFC: NULL out the dev-\u003erfkill to prevent UAF\n\nCommit 3e3b5dfcd16a (\"NFC: reorder the logic in nfc_{un,}register_device\")\nassumes the device_is_registered() in function nfc_dev_up() will help\nto check when the rfkill is unregistered. However, this check only\ntake effect when device_del(\u0026dev-\u003edev) is done in nfc_unregister_device().\nHence, the rfkill object is still possible be dereferenced.\n\nThe crash trace in latest kernel (5.18-rc2):\n\n[   68.760105] ==================================================================\n[   68.760330] BUG: KASAN: use-after-free in __lock_acquire+0x3ec1/0x6750\n[   68.760756] Read of size 8 at addr ffff888009c93018 by task fuzz/313\n[   68.760756]\n[   68.760756] CPU: 0 PID: 313 Comm: fuzz Not tainted 5.18.0-rc2 #4\n[   68.760756] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\n[   68.760756] Call Trace:\n[   68.760756]  \u003cTASK\u003e\n[   68.760756]  dump_stack_lvl+0x57/0x7d\n[   68.760756]  print_report.cold+0x5e/0x5db\n[   68.760756]  ? __lock_acquire+0x3ec1/0x6750\n[   68.760756]  kasan_report+0xbe/0x1c0\n[   68.760756]  ? __lock_acquire+0x3ec1/0x6750\n[   68.760756]  __lock_acquire+0x3ec1/0x6750\n[   68.760756]  ? lockdep_hardirqs_on_prepare+0x410/0x410\n[   68.760756]  ? register_lock_class+0x18d0/0x18d0\n[   68.760756]  lock_acquire+0x1ac/0x4f0\n[   68.760756]  ? rfkill_blocked+0xe/0x60\n[   68.760756]  ? lockdep_hardirqs_on_prepare+0x410/0x410\n[   68.760756]  ? mutex_lock_io_nested+0x12c0/0x12c0\n[   68.760756]  ? nla_get_range_signed+0x540/0x540\n[   68.760756]  ? _raw_spin_lock_irqsave+0x4e/0x50\n[   68.760756]  _raw_spin_lock_irqsave+0x39/0x50\n[   68.760756]  ? rfkill_blocked+0xe/0x60\n[   68.760756]  rfkill_blocked+0xe/0x60\n[   68.760756]  nfc_dev_up+0x84/0x260\n[   68.760756]  nfc_genl_dev_up+0x90/0xe0\n[   68.760756]  genl_family_rcv_msg_doit+0x1f4/0x2f0\n[   68.760756]  ? genl_family_rcv_msg_attrs_parse.constprop.0+0x230/0x230\n[   68.760756]  ? security_capable+0x51/0x90\n[   68.760756]  genl_rcv_msg+0x280/0x500\n[   68.760756]  ? genl_get_cmd+0x3c0/0x3c0\n[   68.760756]  ? lock_acquire+0x1ac/0x4f0\n[   68.760756]  ? nfc_genl_dev_down+0xe0/0xe0\n[   68.760756]  ? lockdep_hardirqs_on_prepare+0x410/0x410\n[   68.760756]  netlink_rcv_skb+0x11b/0x340\n[   68.760756]  ? genl_get_cmd+0x3c0/0x3c0\n[   68.760756]  ? netlink_ack+0x9c0/0x9c0\n[   68.760756]  ? netlink_deliver_tap+0x136/0xb00\n[   68.760756]  genl_rcv+0x1f/0x30\n[   68.760756]  netlink_unicast+0x430/0x710\n[   68.760756]  ? memset+0x20/0x40\n[   68.760756]  ? netlink_attachskb+0x740/0x740\n[   68.760756]  ? __build_skb_around+0x1f4/0x2a0\n[   68.760756]  netlink_sendmsg+0x75d/0xc00\n[   68.760756]  ? netlink_unicast+0x710/0x710\n[   68.760756]  ? netlink_unicast+0x710/0x710\n[   68.760756]  sock_sendmsg+0xdf/0x110\n[   68.760756]  __sys_sendto+0x19e/0x270\n[   68.760756]  ? __ia32_sys_getpeername+0xa0/0xa0\n[   68.760756]  ? fd_install+0x178/0x4c0\n[   68.760756]  ? fd_install+0x195/0x4c0\n[   68.760756]  ? kernel_fpu_begin_mask+0x1c0/0x1c0\n[   68.760756]  __x64_sys_sendto+0xd8/0x1b0\n[   68.760756]  ? lockdep_hardirqs_on+0xbf/0x130\n[   68.760756]  ? syscall_enter_from_user_mode+0x1d/0x50\n[   68.760756]  do_syscall_64+0x3b/0x90\n[   68.760756]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n[   68.760756] RIP: 0033:0x7f67fb50e6b3\n...\n[   68.760756] RSP: 002b:00007f67fa91fe90 EFLAGS: 00000293 ORIG_RAX: 000000000000002c\n[   68.760756] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f67fb50e6b3\n[   68.760756] RDX: 000000000000001c RSI: 0000559354603090 RDI: 0000000000000003\n[   68.760756] RBP: 00007f67fa91ff00 R08: 00007f67fa91fedc R09: 000000000000000c\n[   68.760756] R10: 0000000000000000 R11: 0000000000000293 R12: 00007ffe824d496e\n[   68.760756] R13: 00007ffe824d496f R14: 00007f67fa120000 R15: 0000000000000003\n\n[   68.760756]  \u003c/TASK\u003e\n[   68.760756]\n[   68.760756] Allocated by task 279:\n[   68.760756]  kasan_save_stack+0x1e/0x40\n[\n---truncated---"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: NFC: NULL en dev-\u0026gt;rfkill para evitar UAF Commit 3e3b5dfcd16a (\"NFC: reordenar la l\u00f3gica en nfc_{un,}register_device\") supone que device_is_registered() en la funci\u00f3n nfc_dev_up() ayudar\u00e1 a comprobar cu\u00e1ndo se anula el registro de rfkill. Sin embargo, esta comprobaci\u00f3n solo tiene efecto cuando se realiza device_del(\u0026amp;dev-\u0026gt;dev) en nfc_unregister_device(). Por lo tanto, el objeto rfkill a\u00fan puede desreferenciarse. El rastro de falla en el kernel m\u00e1s reciente (5.18-rc2): [ 68.760105] ======================================================================= [ 68.760330] BUG: KASAN: use-after-free in __lock_acquire+0x3ec1/0x6750 [ 68.760756] Read of size 8 at addr ffff888009c93018 by task fuzz/313 [ 68.760756] [ 68.760756] CPU: 0 PID: 313 Comm: fuzz Not tainted 5.18.0-rc2 #4 [ 68.760756] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 68.760756] Call Trace: [ 68.760756]  [ 68.760756] dump_stack_lvl+0x57/0x7d [ 68.760756] print_report.cold+0x5e/0x5db [ 68.760756] ? __lock_acquire+0x3ec1/0x6750 [ 68.760756] kasan_report+0xbe/0x1c0 [ 68.760756] ? __lock_acquire+0x3ec1/0x6750 [ 68.760756] __lock_acquire+0x3ec1/0x6750 [ 68.760756] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 68.760756] ? register_lock_class+0x18d0/0x18d0 [ 68.760756] lock_acquire+0x1ac/0x4f0 [ 68.760756] ? rfkill_blocked+0xe/0x60 [ 68.760756] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 68.760756] ? mutex_lock_io_nested+0x12c0/0x12c0 [ 68.760756] ? nla_get_range_signed+0x540/0x540 [ 68.760756] ? _raw_spin_lock_irqsave+0x4e/0x50 [ 68.760756] _raw_spin_lock_irqsave+0x39/0x50 [ 68.760756] ? rfkill_blocked+0xe/0x60 [ 68.760756] rfkill_blocked+0xe/0x60 [ 68.760756] nfc_dev_up+0x84/0x260 [ 68.760756] nfc_genl_dev_up+0x90/0xe0 [ 68.760756] genl_family_rcv_msg_doit+0x1f4/0x2f0 [ 68.760756] ? genl_family_rcv_msg_attrs_parse.constprop.0+0x230/0x230 [ 68.760756] ? security_capable+0x51/0x90 [ 68.760756] genl_rcv_msg+0x280/0x500 [ 68.760756] ? genl_get_cmd+0x3c0/0x3c0 [ 68.760756] ? lock_acquire+0x1ac/0x4f0 [ 68.760756] ? nfc_genl_dev_down+0xe0/0xe0 [ 68.760756] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 68.760756] netlink_rcv_skb+0x11b/0x340 [ 68.760756] ? genl_get_cmd+0x3c0/0x3c0 [ 68.760756] ? netlink_ack+0x9c0/0x9c0 [ 68.760756] ? netlink_deliver_tap+0x136/0xb00 [ 68.760756] genl_rcv+0x1f/0x30 [ 68.760756] netlink_unicast+0x430/0x710 [ 68.760756] ? memset+0x20/0x40 [ 68.760756] ? netlink_attachskb+0x740/0x740 [ 68.760756] ? __build_skb_around+0x1f4/0x2a0 [ 68.760756] netlink_sendmsg+0x75d/0xc00 [ 68.760756] ? netlink_unicast+0x710/0x710 [ 68.760756] ? netlink_unicast+0x710/0x710 [ 68.760756] sock_sendmsg+0xdf/0x110 [ 68.760756] __sys_sendto+0x19e/0x270 [ 68.760756] ? __ia32_sys_getpeername+0xa0/0xa0 [ 68.760756] ? fd_install+0x178/0x4c0 [ 68.760756] ? fd_install+0x195/0x4c0 [ 68.760756] ? kernel_fpu_begin_mask+0x1c0/0x1c0 [ 68.760756] __x64_sys_sendto+0xd8/0x1b0 [ 68.760756] ? lockdep_hardirqs_on+0xbf/0x130 [ 68.760756] ? syscall_enter_from_user_mode+0x1d/0x50 [ 68.760756] do_syscall_64+0x3b/0x90 [ 68.760756] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 68.760756] RIP: 0033:0x7f67fb50e6b3 ... [ 68.760756] RSP: 002b:00007f67fa91fe90 EFLAGS: 00000293 ORIG_RAX: 000000000000002c [ 68.760756] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f67fb50e6b3 [ 68.760756] RDX: 000000000000001c RSI: 0000559354603090 RDI: 0000000000000003 [ 68.760756] RBP: 00007f67fa91ff00 R08: 00007f67fa91fedc R09: 000000000000000c [ 68.760756] R10: 0000000000000000 R11: 0000000000000293 R12: 00007ffe824d496e [ 68.760756] R13: 00007ffe824d496f R14: 00007f67fa120000 R15: 0000000000000003 [ 68.760756]  [ 68.760756] [ 68.760756] Allocated by task 279: [ 68.760756] kasan_save_stack+0x1e/0x40 [ ---truncated--- "
          }
        ],
        "id": "CVE-2022-49505",
        "lastModified": "2026-06-17T05:18:16.100",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2022-49505",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-27T17:58:28.672028Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2025-02-26T07:01:26.633",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/1632be63862f183cd5cf1cc094e698e6ec005dfd"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/1b0e81416a24d6e9b8c2341e22e8bf48f8b8bfc9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/2a1b5110c95e4d49c8c3906270dfcde680a5a7be"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/4a68938f43b7c2663e4c90bb9bbe29ac8b9a42a0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/4f5d71930f41be78557f9714393179025baacd65"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/6abfaca8711803d0d7cc8c0fac1070a88509d463"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/a8e03bcad52dc9afabf650fdbad84f739cec9efa"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/f81270125b50532624400063281e6611ecd61ddf"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/fbf9c4c714d3cdeb98b6a18e4d057f931cad1d81"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-06-29T20:18:36+00:00",
      "cve": "CVE-2022-49505",
      "id": "CVE-2022-49505",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: NFC: NULL out the dev-\u003erfkill to prevent UAF",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49505.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-02T02:04:03Z",
      "cve": "CVE-2022-49505",
      "id": "CVE-2022-49505",
      "initial_release_date": "2025-02-27T03:05:49Z",
      "product_status:known_affected": "497",
      "product_status:known_not_affected": "154",
      "product_status:recommended": "333",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49505",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49505.json",
      "version": "61"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "LOCAL",
                  "availabilityImpact": "HIGH",
                  "baseScore": 7.8,
                  "baseSeverity": "HIGH",
                  "confidentialityImpact": "HIGH",
                  "integrityImpact": "HIGH",
                  "privilegesRequired": "LOW",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2022-49505",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-02-27T17:58:28.672028Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-416",
                    "description": "CWE-416 Use After Free",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-02-27T17:58:30.297Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "net/nfc/core.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "a8e03bcad52dc9afabf650fdbad84f739cec9efa",
                  "status": "affected",
                  "version": "ff169909eac9e00bf1aa0af739ba6ddfb1b1d135",
                  "versionType": "git"
                },
                {
                  "lessThan": "f81270125b50532624400063281e6611ecd61ddf",
                  "status": "affected",
                  "version": "47244ac0b65bd74cc70007d8e1bac68bd2baad19",
                  "versionType": "git"
                },
                {
                  "lessThan": "6abfaca8711803d0d7cc8c0fac1070a88509d463",
                  "status": "affected",
                  "version": "c45cea83e13699bdfd47842e04d09dd43af4c371",
                  "versionType": "git"
                },
                {
                  "lessThan": "fbf9c4c714d3cdeb98b6a18e4d057f931cad1d81",
                  "status": "affected",
                  "version": "307d2e6cebfca9d92f86c8e2c8e3dd4a8be46ba6",
                  "versionType": "git"
                },
                {
                  "lessThan": "2a1b5110c95e4d49c8c3906270dfcde680a5a7be",
                  "status": "affected",
                  "version": "73a0d12114b4bc1a9def79a623264754b9df698e",
                  "versionType": "git"
                },
                {
                  "lessThan": "1632be63862f183cd5cf1cc094e698e6ec005dfd",
                  "status": "affected",
                  "version": "8a9c61c3ef187d8891225f9b932390670a43a0d3",
                  "versionType": "git"
                },
                {
                  "lessThan": "4a68938f43b7c2663e4c90bb9bbe29ac8b9a42a0",
                  "status": "affected",
                  "version": "3e3b5dfcd16a3e254aab61bd1e8c417dd4503102",
                  "versionType": "git"
                },
                {
                  "lessThan": "4f5d71930f41be78557f9714393179025baacd65",
                  "status": "affected",
                  "version": "3e3b5dfcd16a3e254aab61bd1e8c417dd4503102",
                  "versionType": "git"
                },
                {
                  "lessThan": "1b0e81416a24d6e9b8c2341e22e8bf48f8b8bfc9",
                  "status": "affected",
                  "version": "3e3b5dfcd16a3e254aab61bd1e8c417dd4503102",
                  "versionType": "git"
                },
                {
                  "status": "affected",
                  "version": "5ef16d2d172ee56714cff37cd005b98aba08ef5a",
                  "versionType": "git"
                },
                {
                  "lessThan": "4.9.318",
                  "status": "affected",
                  "version": "4.9.291",
                  "versionType": "semver"
                },
                {
                  "lessThan": "4.14.283",
                  "status": "affected",
                  "version": "4.14.256",
                  "versionType": "semver"
                },
                {
                  "lessThan": "4.19.247",
                  "status": "affected",
                  "version": "4.19.218",
                  "versionType": "semver"
                },
                {
                  "lessThan": "5.4.198",
                  "status": "affected",
                  "version": "5.4.162",
                  "versionType": "semver"
                },
                {
                  "lessThan": "5.10.121",
                  "status": "affected",
                  "version": "5.10.82",
                  "versionType": "semver"
                },
                {
                  "lessThan": "5.15.46",
                  "status": "affected",
                  "version": "5.15.5",
                  "versionType": "semver"
                },
                {
                  "lessThan": "4.5",
                  "status": "affected",
                  "version": "4.4.293",
                  "versionType": "semver"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "net/nfc/core.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.16"
                },
                {
                  "lessThan": "5.16",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.9.*",
                  "status": "unaffected",
                  "version": "4.9.318",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.14.*",
                  "status": "unaffected",
                  "version": "4.14.283",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.19.*",
                  "status": "unaffected",
                  "version": "4.19.247",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.198",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.121",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.46",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.17.*",
                  "status": "unaffected",
                  "version": "5.17.14",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.18.*",
                  "status": "unaffected",
                  "version": "5.18.3",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.19",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.9.318",
                      "versionStartIncluding": "4.9.291",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.14.283",
                      "versionStartIncluding": "4.14.256",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.19.247",
                      "versionStartIncluding": "4.19.218",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.198",
                      "versionStartIncluding": "5.4.162",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.121",
                      "versionStartIncluding": "5.10.82",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.46",
                      "versionStartIncluding": "5.15.5",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.17.14",
                      "versionStartIncluding": "5.16",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.18.3",
                      "versionStartIncluding": "5.16",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.19",
                      "versionStartIncluding": "5.16",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "4.4.293",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFC: NULL out the dev-\u003erfkill to prevent UAF\n\nCommit 3e3b5dfcd16a (\"NFC: reorder the logic in nfc_{un,}register_device\")\nassumes the device_is_registered() in function nfc_dev_up() will help\nto check when the rfkill is unregistered. However, this check only\ntake effect when device_del(\u0026dev-\u003edev) is done in nfc_unregister_device().\nHence, the rfkill object is still possible be dereferenced.\n\nThe crash trace in latest kernel (5.18-rc2):\n\n[   68.760105] ==================================================================\n[   68.760330] BUG: KASAN: use-after-free in __lock_acquire+0x3ec1/0x6750\n[   68.760756] Read of size 8 at addr ffff888009c93018 by task fuzz/313\n[   68.760756]\n[   68.760756] CPU: 0 PID: 313 Comm: fuzz Not tainted 5.18.0-rc2 #4\n[   68.760756] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\n[   68.760756] Call Trace:\n[   68.760756]  \u003cTASK\u003e\n[   68.760756]  dump_stack_lvl+0x57/0x7d\n[   68.760756]  print_report.cold+0x5e/0x5db\n[   68.760756]  ? __lock_acquire+0x3ec1/0x6750\n[   68.760756]  kasan_report+0xbe/0x1c0\n[   68.760756]  ? __lock_acquire+0x3ec1/0x6750\n[   68.760756]  __lock_acquire+0x3ec1/0x6750\n[   68.760756]  ? lockdep_hardirqs_on_prepare+0x410/0x410\n[   68.760756]  ? register_lock_class+0x18d0/0x18d0\n[   68.760756]  lock_acquire+0x1ac/0x4f0\n[   68.760756]  ? rfkill_blocked+0xe/0x60\n[   68.760756]  ? lockdep_hardirqs_on_prepare+0x410/0x410\n[   68.760756]  ? mutex_lock_io_nested+0x12c0/0x12c0\n[   68.760756]  ? nla_get_range_signed+0x540/0x540\n[   68.760756]  ? _raw_spin_lock_irqsave+0x4e/0x50\n[   68.760756]  _raw_spin_lock_irqsave+0x39/0x50\n[   68.760756]  ? rfkill_blocked+0xe/0x60\n[   68.760756]  rfkill_blocked+0xe/0x60\n[   68.760756]  nfc_dev_up+0x84/0x260\n[   68.760756]  nfc_genl_dev_up+0x90/0xe0\n[   68.760756]  genl_family_rcv_msg_doit+0x1f4/0x2f0\n[   68.760756]  ? genl_family_rcv_msg_attrs_parse.constprop.0+0x230/0x230\n[   68.760756]  ? security_capable+0x51/0x90\n[   68.760756]  genl_rcv_msg+0x280/0x500\n[   68.760756]  ? genl_get_cmd+0x3c0/0x3c0\n[   68.760756]  ? lock_acquire+0x1ac/0x4f0\n[   68.760756]  ? nfc_genl_dev_down+0xe0/0xe0\n[   68.760756]  ? lockdep_hardirqs_on_prepare+0x410/0x410\n[   68.760756]  netlink_rcv_skb+0x11b/0x340\n[   68.760756]  ? genl_get_cmd+0x3c0/0x3c0\n[   68.760756]  ? netlink_ack+0x9c0/0x9c0\n[   68.760756]  ? netlink_deliver_tap+0x136/0xb00\n[   68.760756]  genl_rcv+0x1f/0x30\n[   68.760756]  netlink_unicast+0x430/0x710\n[   68.760756]  ? memset+0x20/0x40\n[   68.760756]  ? netlink_attachskb+0x740/0x740\n[   68.760756]  ? __build_skb_around+0x1f4/0x2a0\n[   68.760756]  netlink_sendmsg+0x75d/0xc00\n[   68.760756]  ? netlink_unicast+0x710/0x710\n[   68.760756]  ? netlink_unicast+0x710/0x710\n[   68.760756]  sock_sendmsg+0xdf/0x110\n[   68.760756]  __sys_sendto+0x19e/0x270\n[   68.760756]  ? __ia32_sys_getpeername+0xa0/0xa0\n[   68.760756]  ? fd_install+0x178/0x4c0\n[   68.760756]  ? fd_install+0x195/0x4c0\n[   68.760756]  ? kernel_fpu_begin_mask+0x1c0/0x1c0\n[   68.760756]  __x64_sys_sendto+0xd8/0x1b0\n[   68.760756]  ? lockdep_hardirqs_on+0xbf/0x130\n[   68.760756]  ? syscall_enter_from_user_mode+0x1d/0x50\n[   68.760756]  do_syscall_64+0x3b/0x90\n[   68.760756]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n[   68.760756] RIP: 0033:0x7f67fb50e6b3\n...\n[   68.760756] RSP: 002b:00007f67fa91fe90 EFLAGS: 00000293 ORIG_RAX: 000000000000002c\n[   68.760756] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f67fb50e6b3\n[   68.760756] RDX: 000000000000001c RSI: 0000559354603090 RDI: 0000000000000003\n[   68.760756] RBP: 00007f67fa91ff00 R08: 00007f67fa91fedc R09: 000000000000000c\n[   68.760756] R10: 0000000000000000 R11: 0000000000000293 R12: 00007ffe824d496e\n[   68.760756] R13: 00007ffe824d496f R14: 00007f67fa120000 R15: 0000000000000003\n\n[   68.760756]  \u003c/TASK\u003e\n[   68.760756]\n[   68.760756] Allocated by task 279:\n[   68.760756]  kasan_save_stack+0x1e/0x40\n[\n---truncated---"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The UAF is reached via local netlink (NFC_CMD_DEV_UP \u2192 nfc_genl_dev_up \u2192 nfc_dev_up) raced with local device teardown (TTY N_NCI close / nfc_unregister_device), not via NFC radio frames or remote packet processing.\nAC:L - The attacker controls both sides of the race\u2014creating/destroying an NFC device (e.g. N_NCI on a PTY with nfcmrvl) while issuing concurrent NFC_CMD_DEV_UP\u2014and the window between rfkill_destroy and device_del includes sleeping work (llcp unregister, timers), so the race is reliably repeatable.\nPR:L - Unprivileged users can attach N_NCI and register/unregister NFC devices with no capability check on the TTY path; NFC_CMD_DEV_UP uses GENL_ADMIN_PERM, but on NFC-enabled systems a management daemon performs DEV_UP, and when uncertain between PR:L and PR:H the higher-severity Low is chosen.\nUI:N - The attacker drives device create/teardown and DEV_UP (directly or via racing an always-on NFC service) without any separate victim action such as mounting a filesystem or opening a user file.\nS:U - Impact is host-kernel heap UAF within the same OS security authority; this is standard local privilege escalation, not a VM escape, IOMMU/DMA bypass, or sandbox boundary cross.\nC:H - rfkill_blocked() operates on a freed struct rfkill (spinlock/state); classic UAF reclaim/heap spray yields arbitrary kernel read primitives, scored Confidentiality High per UAF guidance.\nI:H - The same freed rfkill object can be reallocated and corrupted before rfkill_blocked() runs, enabling heap write and control-flow hijack primitives, scored Integrity High per UAF guidance.\nA:H - KASAN already demonstrates a use-after-free crash in rfkill_blocked/nfc_dev_up; even without full exploitation this produces a kernel oops/panic (Availability High)."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T08:55:23.598Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/a8e03bcad52dc9afabf650fdbad84f739cec9efa"
            },
            {
              "url": "https://git.kernel.org/stable/c/f81270125b50532624400063281e6611ecd61ddf"
            },
            {
              "url": "https://git.kernel.org/stable/c/6abfaca8711803d0d7cc8c0fac1070a88509d463"
            },
            {
              "url": "https://git.kernel.org/stable/c/fbf9c4c714d3cdeb98b6a18e4d057f931cad1d81"
            },
            {
              "url": "https://git.kernel.org/stable/c/2a1b5110c95e4d49c8c3906270dfcde680a5a7be"
            },
            {
              "url": "https://git.kernel.org/stable/c/1632be63862f183cd5cf1cc094e698e6ec005dfd"
            },
            {
              "url": "https://git.kernel.org/stable/c/4a68938f43b7c2663e4c90bb9bbe29ac8b9a42a0"
            },
            {
              "url": "https://git.kernel.org/stable/c/4f5d71930f41be78557f9714393179025baacd65"
            },
            {
              "url": "https://git.kernel.org/stable/c/1b0e81416a24d6e9b8c2341e22e8bf48f8b8bfc9"
            }
          ],
          "title": "NFC: NULL out the dev-\u003erfkill to prevent UAF",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2022-49505",
        "datePublished": "2025-02-26T02:13:37.496Z",
        "dateReserved": "2025-02-26T02:08:31.586Z",
        "dateUpdated": "2026-08-05T08:55:23.598Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


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