fkie_cve-2022-50881
Vulnerability from fkie_nvd
Published
2025-12-30 13:16
Modified
2025-12-31 20:43
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: ath9k: Fix use-after-free in ath9k_hif_usb_disconnect() This patch fixes a use-after-free in ath9k that occurs in ath9k_hif_usb_disconnect() when ath9k_destroy_wmi() is trying to access 'drv_priv' that has already been freed by ieee80211_free_hw(), called by ath9k_htc_hw_deinit(). The patch moves ath9k_destroy_wmi() before ieee80211_free_hw(). Note that urbs from the driver should be killed before freeing 'wmi' with ath9k_destroy_wmi() as their callbacks will access 'wmi'. Found by a modified version of syzkaller. ================================================================== BUG: KASAN: use-after-free in ath9k_destroy_wmi+0x38/0x40 Read of size 8 at addr ffff8881069132a0 by task kworker/0:1/7 CPU: 0 PID: 7 Comm: kworker/0:1 Tainted: G O 5.14.0+ #131 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014 Workqueue: usb_hub_wq hub_event Call Trace: dump_stack_lvl+0x8e/0xd1 print_address_description.constprop.0.cold+0x93/0x334 ? ath9k_destroy_wmi+0x38/0x40 ? ath9k_destroy_wmi+0x38/0x40 kasan_report.cold+0x83/0xdf ? ath9k_destroy_wmi+0x38/0x40 ath9k_destroy_wmi+0x38/0x40 ath9k_hif_usb_disconnect+0x329/0x3f0 ? ath9k_hif_usb_suspend+0x120/0x120 ? usb_disable_interface+0xfc/0x180 usb_unbind_interface+0x19b/0x7e0 ? usb_autoresume_device+0x50/0x50 device_release_driver_internal+0x44d/0x520 bus_remove_device+0x2e5/0x5a0 device_del+0x5b2/0xe30 ? __device_link_del+0x370/0x370 ? usb_remove_ep_devs+0x43/0x80 ? remove_intf_ep_devs+0x112/0x1a0 usb_disable_device+0x1e3/0x5a0 usb_disconnect+0x267/0x870 hub_event+0x168d/0x3950 ? rcu_read_lock_sched_held+0xa1/0xd0 ? hub_port_debounce+0x2e0/0x2e0 ? check_irq_usage+0x860/0xf20 ? drain_workqueue+0x281/0x360 ? lock_release+0x640/0x640 ? rcu_read_lock_sched_held+0xa1/0xd0 ? rcu_read_lock_bh_held+0xb0/0xb0 ? lockdep_hardirqs_on_prepare+0x273/0x3e0 process_one_work+0x92b/0x1460 ? pwq_dec_nr_in_flight+0x330/0x330 ? rwlock_bug.part.0+0x90/0x90 worker_thread+0x95/0xe00 ? __kthread_parkme+0x115/0x1e0 ? process_one_work+0x1460/0x1460 kthread+0x3a1/0x480 ? set_kthread_struct+0x120/0x120 ret_from_fork+0x1f/0x30 The buggy address belongs to the page: page:ffffea00041a44c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106913 flags: 0x200000000000000(node=0|zone=2) raw: 0200000000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 3, migratetype Unmovable, gfp_mask 0x40dc0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), pid 7, ts 38347963444, free_ts 41399957635 prep_new_page+0x1aa/0x240 get_page_from_freelist+0x159a/0x27c0 __alloc_pages+0x2da/0x6a0 alloc_pages+0xec/0x1e0 kmalloc_order+0x39/0xf0 kmalloc_order_trace+0x19/0x120 __kmalloc+0x308/0x390 wiphy_new_nm+0x6f5/0x1dd0 ieee80211_alloc_hw_nm+0x36d/0x2230 ath9k_htc_probe_device+0x9d/0x1e10 ath9k_htc_hw_init+0x34/0x50 ath9k_hif_usb_firmware_cb+0x25f/0x4e0 request_firmware_work_func+0x131/0x240 process_one_work+0x92b/0x1460 worker_thread+0x95/0xe00 kthread+0x3a1/0x480 page last free stack trace: free_pcp_prepare+0x3d3/0x7f0 free_unref_page+0x1e/0x3d0 device_release+0xa4/0x240 kobject_put+0x186/0x4c0 put_device+0x20/0x30 ath9k_htc_disconnect_device+0x1cf/0x2c0 ath9k_htc_hw_deinit+0x26/0x30 ath9k_hif_usb_disconnect+0x2d9/0x3f0 usb_unbind_interface+0x19b/0x7e0 device_release_driver_internal+0x44d/0x520 bus_remove_device+0x2e5/0x5a0 device_del+0x5b2/0xe30 usb_disable_device+0x1e3/0x5a0 usb_disconnect+0x267/0x870 hub_event+0x168d/0x3950 process_one_work+0x92b/0x1460 Memory state around the buggy address: ffff888106913180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888106913200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888 ---truncated---
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1f137c634a8c8faba648574f687805641e62f92e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/634a5471a6bd774c0d0fa448dfa6ec593e899ec9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/99ff971b62e5bd5dee65bbe9777375206f5db791
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de15e8bbd9eb26fe94a06d0ec7be82dc490eb729
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f099c5c9e2ba08a379bd354a82e05ef839ae29ac
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath9k: Fix use-after-free in ath9k_hif_usb_disconnect()\n\nThis patch fixes a use-after-free in ath9k that occurs in\nath9k_hif_usb_disconnect() when ath9k_destroy_wmi() is trying to access\n\u0027drv_priv\u0027 that has already been freed by ieee80211_free_hw(), called by\nath9k_htc_hw_deinit(). The patch moves ath9k_destroy_wmi() before\nieee80211_free_hw(). Note that urbs from the driver should be killed\nbefore freeing \u0027wmi\u0027 with ath9k_destroy_wmi() as their callbacks will\naccess \u0027wmi\u0027.\n\nFound by a modified version of syzkaller.\n\n==================================================================\nBUG: KASAN: use-after-free in ath9k_destroy_wmi+0x38/0x40\nRead of size 8 at addr ffff8881069132a0 by task kworker/0:1/7\n\nCPU: 0 PID: 7 Comm: kworker/0:1 Tainted: G O 5.14.0+ #131\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014\nWorkqueue: usb_hub_wq hub_event\nCall Trace:\n dump_stack_lvl+0x8e/0xd1\n print_address_description.constprop.0.cold+0x93/0x334\n ? ath9k_destroy_wmi+0x38/0x40\n ? ath9k_destroy_wmi+0x38/0x40\n kasan_report.cold+0x83/0xdf\n ? ath9k_destroy_wmi+0x38/0x40\n ath9k_destroy_wmi+0x38/0x40\n ath9k_hif_usb_disconnect+0x329/0x3f0\n ? ath9k_hif_usb_suspend+0x120/0x120\n ? usb_disable_interface+0xfc/0x180\n usb_unbind_interface+0x19b/0x7e0\n ? usb_autoresume_device+0x50/0x50\n device_release_driver_internal+0x44d/0x520\n bus_remove_device+0x2e5/0x5a0\n device_del+0x5b2/0xe30\n ? __device_link_del+0x370/0x370\n ? usb_remove_ep_devs+0x43/0x80\n ? remove_intf_ep_devs+0x112/0x1a0\n usb_disable_device+0x1e3/0x5a0\n usb_disconnect+0x267/0x870\n hub_event+0x168d/0x3950\n ? rcu_read_lock_sched_held+0xa1/0xd0\n ? hub_port_debounce+0x2e0/0x2e0\n ? check_irq_usage+0x860/0xf20\n ? drain_workqueue+0x281/0x360\n ? lock_release+0x640/0x640\n ? rcu_read_lock_sched_held+0xa1/0xd0\n ? rcu_read_lock_bh_held+0xb0/0xb0\n ? lockdep_hardirqs_on_prepare+0x273/0x3e0\n process_one_work+0x92b/0x1460\n ? pwq_dec_nr_in_flight+0x330/0x330\n ? rwlock_bug.part.0+0x90/0x90\n worker_thread+0x95/0xe00\n ? __kthread_parkme+0x115/0x1e0\n ? process_one_work+0x1460/0x1460\n kthread+0x3a1/0x480\n ? set_kthread_struct+0x120/0x120\n ret_from_fork+0x1f/0x30\n\nThe buggy address belongs to the page:\npage:ffffea00041a44c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106913\nflags: 0x200000000000000(node=0|zone=2)\nraw: 0200000000000000 0000000000000000 dead000000000122 0000000000000000\nraw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\npage_owner tracks the page as freed\npage last allocated via order 3, migratetype Unmovable, gfp_mask 0x40dc0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), pid 7, ts 38347963444, free_ts 41399957635\n prep_new_page+0x1aa/0x240\n get_page_from_freelist+0x159a/0x27c0\n __alloc_pages+0x2da/0x6a0\n alloc_pages+0xec/0x1e0\n kmalloc_order+0x39/0xf0\n kmalloc_order_trace+0x19/0x120\n __kmalloc+0x308/0x390\n wiphy_new_nm+0x6f5/0x1dd0\n ieee80211_alloc_hw_nm+0x36d/0x2230\n ath9k_htc_probe_device+0x9d/0x1e10\n ath9k_htc_hw_init+0x34/0x50\n ath9k_hif_usb_firmware_cb+0x25f/0x4e0\n request_firmware_work_func+0x131/0x240\n process_one_work+0x92b/0x1460\n worker_thread+0x95/0xe00\n kthread+0x3a1/0x480\npage last free stack trace:\n free_pcp_prepare+0x3d3/0x7f0\n free_unref_page+0x1e/0x3d0\n device_release+0xa4/0x240\n kobject_put+0x186/0x4c0\n put_device+0x20/0x30\n ath9k_htc_disconnect_device+0x1cf/0x2c0\n ath9k_htc_hw_deinit+0x26/0x30\n ath9k_hif_usb_disconnect+0x2d9/0x3f0\n usb_unbind_interface+0x19b/0x7e0\n device_release_driver_internal+0x44d/0x520\n bus_remove_device+0x2e5/0x5a0\n device_del+0x5b2/0xe30\n usb_disable_device+0x1e3/0x5a0\n usb_disconnect+0x267/0x870\n hub_event+0x168d/0x3950\n process_one_work+0x92b/0x1460\n\nMemory state around the buggy address:\n ffff888106913180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ffff888106913200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n\u003effff888\n---truncated---"
    }
  ],
  "id": "CVE-2022-50881",
  "lastModified": "2025-12-31T20:43:05.160",
  "metrics": {},
  "published": "2025-12-30T13:16:03.173",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1f137c634a8c8faba648574f687805641e62f92e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/634a5471a6bd774c0d0fa448dfa6ec593e899ec9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/99ff971b62e5bd5dee65bbe9777375206f5db791"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/de15e8bbd9eb26fe94a06d0ec7be82dc490eb729"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f099c5c9e2ba08a379bd354a82e05ef839ae29ac"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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