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      "text": "High"
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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
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          "date": "2022-01-01T00:00:00Z",
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        {
          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: nci: add flush_workqueue to prevent uaf\n\nOur detector found a concurrent use-after-free bug when detaching an\nNCI device. The main reason for this bug is the unexpected scheduling\nbetween the used delayed mechanism (timer and workqueue).\n\nThe race can be demonstrated below:\n\nThread-1                           Thread-2\n                                 | nci_dev_up()\n                                 |   nci_open_device()\n                                 |     __nci_request(nci_reset_req)\n                                 |       nci_send_cmd\n                                 |         queue_work(cmd_work)\nnci_unregister_device()          |\n  nci_close_device()             | ...\n    del_timer_sync(cmd_timer)[1] |\n...                              | Worker\nnci_free_device()                | nci_cmd_work()\n  kfree(ndev)[3]                 |   mod_timer(cmd_timer)[2]\n\nIn short, the cleanup routine thought that the cmd_timer has already\nbeen detached by [1] but the mod_timer can re-attach the timer [2], even\nit is already released [3], resulting in UAF.\n\nThis UAF is easy to trigger, crash trace by POC is like below\n\n[   66.703713] ==================================================================\n[   66.703974] BUG: KASAN: use-after-free in enqueue_timer+0x448/0x490\n[   66.703974] Write of size 8 at addr ffff888009fb7058 by task kworker/u4:1/33\n[   66.703974]\n[   66.703974] CPU: 1 PID: 33 Comm: kworker/u4:1 Not tainted 5.18.0-rc2 #5\n[   66.703974] Workqueue: nfc2_nci_cmd_wq nci_cmd_work\n[   66.703974] Call Trace:\n[   66.703974]  <TASK>\n[   66.703974]  dump_stack_lvl+0x57/0x7d\n[   66.703974]  print_report.cold+0x5e/0x5db\n[   66.703974]  ? enqueue_timer+0x448/0x490\n[   66.703974]  kasan_report+0xbe/0x1c0\n[   66.703974]  ? enqueue_timer+0x448/0x490\n[   66.703974]  enqueue_timer+0x448/0x490\n[   66.703974]  __mod_timer+0x5e6/0xb80\n[   66.703974]  ? mark_held_locks+0x9e/0xe0\n[   66.703974]  ? try_to_del_timer_sync+0xf0/0xf0\n[   66.703974]  ? lockdep_hardirqs_on_prepare+0x17b/0x410\n[   66.703974]  ? queue_work_on+0x61/0x80\n[   66.703974]  ? lockdep_hardirqs_on+0xbf/0x130\n[   66.703974]  process_one_work+0x8bb/0x1510\n[   66.703974]  ? lockdep_hardirqs_on_prepare+0x410/0x410\n[   66.703974]  ? pwq_dec_nr_in_flight+0x230/0x230\n[   66.703974]  ? rwlock_bug.part.0+0x90/0x90\n[   66.703974]  ? _raw_spin_lock_irq+0x41/0x50\n[   66.703974]  worker_thread+0x575/0x1190\n[   66.703974]  ? process_one_work+0x1510/0x1510\n[   66.703974]  kthread+0x2a0/0x340\n[   66.703974]  ? kthread_complete_and_exit+0x20/0x20\n[   66.703974]  ret_from_fork+0x22/0x30\n[   66.703974]  </TASK>\n[   66.703974]\n[   66.703974] Allocated by task 267:\n[   66.703974]  kasan_save_stack+0x1e/0x40\n[   66.703974]  __kasan_kmalloc+0x81/0xa0\n[   66.703974]  nci_allocate_device+0xd3/0x390\n[   66.703974]  nfcmrvl_nci_register_dev+0x183/0x2c0\n[   66.703974]  nfcmrvl_nci_uart_open+0xf2/0x1dd\n[   66.703974]  nci_uart_tty_ioctl+0x2c3/0x4a0\n[   66.703974]  tty_ioctl+0x764/0x1310\n[   66.703974]  __x64_sys_ioctl+0x122/0x190\n[   66.703974]  do_syscall_64+0x3b/0x90\n[   66.703974]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n[   66.703974]\n[   66.703974] Freed by task 406:\n[   66.703974]  kasan_save_stack+0x1e/0x40\n[   66.703974]  kasan_set_track+0x21/0x30\n[   66.703974]  kasan_set_free_info+0x20/0x30\n[   66.703974]  __kasan_slab_free+0x108/0x170\n[   66.703974]  kfree+0xb0/0x330\n[   66.703974]  nfcmrvl_nci_unregister_dev+0x90/0xd0\n[   66.703974]  nci_uart_tty_close+0xdf/0x180\n[   66.703974]  tty_ldisc_kill+0x73/0x110\n[   66.703974]  tty_ldisc_hangup+0x281/0x5b0\n[   66.703974]  __tty_hangup.part.0+0x431/0x890\n[   66.703974]  tty_release+0x3a8/0xc80\n[   66.703974]  __fput+0x1f0/0x8c0\n[   66.703974]  task_work_run+0xc9/0x170\n[   66.703974]  exit_to_user_mode_prepare+0x194/0x1a0\n[   66.703974]  syscall_exit_to_user_mode+0x19/0x50\n[   66.703974]  do_syscall_64+0x48/0x90\n[   66.703974]  entry_SYSCALL_64_after_hwframe+0x44/0x\n---truncated---",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-config-4.19-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.all",
          "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1+tuxcare.els1.all",
          "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-source-4.19-0:4.19.325-1+tuxcare.els1.all",
          "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all"
        ],
        "known_affected": [
          "Debian-10:hyperv-daemons-0:4.19.325-1.amd64",
          "Debian-10:libbpf-dev-0:4.19.325-1.amd64",
          "Debian-10:libbpf4.19-0:4.19.325-1.amd64",
          "Debian-10:libcpupower-dev-0:4.19.325-1.amd64",
          "Debian-10:libcpupower1-0:4.19.325-1.amd64",
          "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1.amd64",
          "Debian-10:linux-config-4.19-0:4.19.325-1.amd64",
          "Debian-10:linux-cpupower-0:4.19.325-1.amd64",
          "Debian-10:linux-doc-4.19-0:4.19.325-1.all",
          "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1.amd64",
          "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1.amd64",
          "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1.amd64",
          "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1.all",
          "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1.amd64",
          "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1.amd64",
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          "Debian-10:linux-libc-dev-0:4.19.325-1.amd64",
          "Debian-10:linux-perf-4.19-0:4.19.325-1.amd64",
          "Debian-10:linux-source-4.19-0:4.19.325-1.all",
          "Debian-10:linux-support-4.19.0-28-0:4.19.325-1.all"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2022-49059"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/1a1748d0dd0f0a98535c6baeef671c8722107639",
          "url": "https://git.kernel.org/stable/c/1a1748d0dd0f0a98535c6baeef671c8722107639"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/5c63ad2b0a267a524c12c88acb1ba9c2d109a801",
          "url": "https://git.kernel.org/stable/c/5c63ad2b0a267a524c12c88acb1ba9c2d109a801"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/67677050cecbe0edfdd81cd508415e9636ba7c65",
          "url": "https://git.kernel.org/stable/c/67677050cecbe0edfdd81cd508415e9636ba7c65"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/7d3232214ca4ea8f7d18df264c3b254aa8089d7f",
          "url": "https://git.kernel.org/stable/c/7d3232214ca4ea8f7d18df264c3b254aa8089d7f"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/9d243aff5f7e6b04e907c617426bbdf26e996ac8",
          "url": "https://git.kernel.org/stable/c/9d243aff5f7e6b04e907c617426bbdf26e996ac8"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/9ded5ae40f4fe37fcc28f36d76bf45df20be5432",
          "url": "https://git.kernel.org/stable/c/9ded5ae40f4fe37fcc28f36d76bf45df20be5432"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/edd4600120641e1714e30112e69a548cfb68e067",
          "url": "https://git.kernel.org/stable/c/edd4600120641e1714e30112e69a548cfb68e067"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/ef27324e2cb7bb24542d6cb2571740eefe6b00dc",
          "url": "https://git.kernel.org/stable/c/ef27324e2cb7bb24542d6cb2571740eefe6b00dc"
        }
      ],
      "release_date": "2025-02-26T07:00:00Z",
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-08-01T23:28:13.883377Z",
          "details": "Affected",
          "product_ids": [
            "Debian-10:hyperv-daemons-0:4.19.325-1.amd64",
            "Debian-10:libbpf-dev-0:4.19.325-1.amd64",
            "Debian-10:libbpf4.19-0:4.19.325-1.amd64",
            "Debian-10:libcpupower-dev-0:4.19.325-1.amd64",
            "Debian-10:libcpupower1-0:4.19.325-1.amd64",
            "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1.amd64",
            "Debian-10:linux-config-4.19-0:4.19.325-1.amd64",
            "Debian-10:linux-cpupower-0:4.19.325-1.amd64",
            "Debian-10:linux-doc-4.19-0:4.19.325-1.all",
            "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1.amd64",
            "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1.amd64",
            "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1.amd64",
            "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1.all",
            "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1.amd64",
            "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1.amd64",
            "Debian-10:linux-kbuild-4.19-0:4.19.325-1.amd64",
            "Debian-10:linux-libc-dev-0:4.19.325-1.amd64",
            "Debian-10:linux-perf-4.19-0:4.19.325-1.amd64",
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            "Debian-10:linux-support-4.19.0-28-0:4.19.325-1.all"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "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"
          },
          "products": [
            "Debian-10:hyperv-daemons-0:4.19.325-1.amd64",
            "Debian-10:libbpf-dev-0:4.19.325-1.amd64",
            "Debian-10:libbpf4.19-0:4.19.325-1.amd64",
            "Debian-10:libcpupower-dev-0:4.19.325-1.amd64",
            "Debian-10:libcpupower1-0:4.19.325-1.amd64",
            "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1.amd64",
            "Debian-10:linux-config-4.19-0:4.19.325-1.amd64",
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            "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1.amd64",
            "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1.amd64",
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            "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1.amd64",
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            "Debian-10:linux-support-4.19.0-28-0:4.19.325-1.all"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    }
  ]
}