CVE-2021-47097 (GCVE-0-2021-47097)

Vulnerability from cvelistv5 – Published: 2024-03-04 18:10 – Updated: 2026-05-23 15:19
VLAI
Title
Input: elantech - fix stack out of bound access in elantech_change_report_id()
Summary
In the Linux kernel, the following vulnerability has been resolved: Input: elantech - fix stack out of bound access in elantech_change_report_id() The array param[] in elantech_change_report_id() must be at least 3 bytes, because elantech_read_reg_params() is calling ps2_command() with PSMOUSE_CMD_GETINFO, that is going to access 3 bytes from param[], but it's defined in the stack as an array of 2 bytes, therefore we have a potential stack out-of-bounds access here, also confirmed by KASAN: [ 6.512374] BUG: KASAN: stack-out-of-bounds in __ps2_command+0x372/0x7e0 [ 6.512397] Read of size 1 at addr ffff8881024d77c2 by task kworker/2:1/118 [ 6.512416] CPU: 2 PID: 118 Comm: kworker/2:1 Not tainted 5.13.0-22-generic #22+arighi20211110 [ 6.512428] Hardware name: LENOVO 20T8000QGE/20T8000QGE, BIOS R1AET32W (1.08 ) 08/14/2020 [ 6.512436] Workqueue: events_long serio_handle_event [ 6.512453] Call Trace: [ 6.512462] show_stack+0x52/0x58 [ 6.512474] dump_stack+0xa1/0xd3 [ 6.512487] print_address_description.constprop.0+0x1d/0x140 [ 6.512502] ? __ps2_command+0x372/0x7e0 [ 6.512516] __kasan_report.cold+0x7d/0x112 [ 6.512527] ? _raw_write_lock_irq+0x20/0xd0 [ 6.512539] ? __ps2_command+0x372/0x7e0 [ 6.512552] kasan_report+0x3c/0x50 [ 6.512564] __asan_load1+0x6a/0x70 [ 6.512575] __ps2_command+0x372/0x7e0 [ 6.512589] ? ps2_drain+0x240/0x240 [ 6.512601] ? dev_printk_emit+0xa2/0xd3 [ 6.512612] ? dev_vprintk_emit+0xc5/0xc5 [ 6.512621] ? __kasan_check_write+0x14/0x20 [ 6.512634] ? mutex_lock+0x8f/0xe0 [ 6.512643] ? __mutex_lock_slowpath+0x20/0x20 [ 6.512655] ps2_command+0x52/0x90 [ 6.512670] elantech_ps2_command+0x4f/0xc0 [psmouse] [ 6.512734] elantech_change_report_id+0x1e6/0x256 [psmouse] [ 6.512799] ? elantech_report_trackpoint.constprop.0.cold+0xd/0xd [psmouse] [ 6.512863] ? ps2_command+0x7f/0x90 [ 6.512877] elantech_query_info.cold+0x6bd/0x9ed [psmouse] [ 6.512943] ? elantech_setup_ps2+0x460/0x460 [psmouse] [ 6.513005] ? psmouse_reset+0x69/0xb0 [psmouse] [ 6.513064] ? psmouse_attr_set_helper+0x2a0/0x2a0 [psmouse] [ 6.513122] ? phys_pmd_init+0x30e/0x521 [ 6.513137] elantech_init+0x8a/0x200 [psmouse] [ 6.513200] ? elantech_init_ps2+0xf0/0xf0 [psmouse] [ 6.513249] ? elantech_query_info+0x440/0x440 [psmouse] [ 6.513296] ? synaptics_send_cmd+0x60/0x60 [psmouse] [ 6.513342] ? elantech_query_info+0x440/0x440 [psmouse] [ 6.513388] ? psmouse_try_protocol+0x11e/0x170 [psmouse] [ 6.513432] psmouse_extensions+0x65d/0x6e0 [psmouse] [ 6.513476] ? psmouse_try_protocol+0x170/0x170 [psmouse] [ 6.513519] ? mutex_unlock+0x22/0x40 [ 6.513526] ? ps2_command+0x7f/0x90 [ 6.513536] ? psmouse_probe+0xa3/0xf0 [psmouse] [ 6.513580] psmouse_switch_protocol+0x27d/0x2e0 [psmouse] [ 6.513624] psmouse_connect+0x272/0x530 [psmouse] [ 6.513669] serio_driver_probe+0x55/0x70 [ 6.513679] really_probe+0x190/0x720 [ 6.513689] driver_probe_device+0x160/0x1f0 [ 6.513697] device_driver_attach+0x119/0x130 [ 6.513705] ? device_driver_attach+0x130/0x130 [ 6.513713] __driver_attach+0xe7/0x1a0 [ 6.513720] ? device_driver_attach+0x130/0x130 [ 6.513728] bus_for_each_dev+0xfb/0x150 [ 6.513738] ? subsys_dev_iter_exit+0x10/0x10 [ 6.513748] ? _raw_write_unlock_bh+0x30/0x30 [ 6.513757] driver_attach+0x2d/0x40 [ 6.513764] serio_handle_event+0x199/0x3d0 [ 6.513775] process_one_work+0x471/0x740 [ 6.513785] worker_thread+0x2d2/0x790 [ 6.513794] ? process_one_work+0x740/0x740 [ 6.513802] kthread+0x1b4/0x1e0 [ 6.513809] ? set_kthread_struct+0x80/0x80 [ 6.513816] ret_from_fork+0x22/0x30 [ 6.513832] The buggy address belongs to the page: [ 6.513838] page:00000000bc35e189 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1024d7 [ 6.513847] flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff) [ 6.513860] raw: 0 ---truncated---
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9e4815cf178561104881e5d687ef69396aca1c8d , < a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be (git)
Affected: dde807b4a44273fa5f62c0cb308295e6d6642550 , < 676c572439e58b7ee6b7ca3f1e5595382921045c (git)
Affected: e4c9062717feda88900b566463228d1c4910af6d , < dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b (git)
Affected: e4c9062717feda88900b566463228d1c4910af6d , < 1d72d9f960ccf1052a0630a68c3d358791dbdaaa (git)
Affected: 5.4.103 , < 5.4.169 (semver)
Affected: 5.10.21 , < 5.10.89 (semver)
Create a notification for this product.
Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.4.169 , ≤ 5.4.* (semver)
Unaffected: 5.10.89 , ≤ 5.10.* (semver)
Unaffected: 5.15.12 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: elantech - fix stack out of bound access in elantech_change_report_id()\n\nThe array param[] in elantech_change_report_id() must be at least 3\nbytes, because elantech_read_reg_params() is calling ps2_command() with\nPSMOUSE_CMD_GETINFO, that is going to access 3 bytes from param[], but\nit\u0027s defined in the stack as an array of 2 bytes, therefore we have a\npotential stack out-of-bounds access here, also confirmed by KASAN:\n\n[    6.512374] BUG: KASAN: stack-out-of-bounds in __ps2_command+0x372/0x7e0\n[    6.512397] Read of size 1 at addr ffff8881024d77c2 by task kworker/2:1/118\n\n[    6.512416] CPU: 2 PID: 118 Comm: kworker/2:1 Not tainted 5.13.0-22-generic #22+arighi20211110\n[    6.512428] Hardware name: LENOVO 20T8000QGE/20T8000QGE, BIOS R1AET32W (1.08 ) 08/14/2020\n[    6.512436] Workqueue: events_long serio_handle_event\n[    6.512453] Call Trace:\n[    6.512462]  show_stack+0x52/0x58\n[    6.512474]  dump_stack+0xa1/0xd3\n[    6.512487]  print_address_description.constprop.0+0x1d/0x140\n[    6.512502]  ? __ps2_command+0x372/0x7e0\n[    6.512516]  __kasan_report.cold+0x7d/0x112\n[    6.512527]  ? _raw_write_lock_irq+0x20/0xd0\n[    6.512539]  ? __ps2_command+0x372/0x7e0\n[    6.512552]  kasan_report+0x3c/0x50\n[    6.512564]  __asan_load1+0x6a/0x70\n[    6.512575]  __ps2_command+0x372/0x7e0\n[    6.512589]  ? ps2_drain+0x240/0x240\n[    6.512601]  ? dev_printk_emit+0xa2/0xd3\n[    6.512612]  ? dev_vprintk_emit+0xc5/0xc5\n[    6.512621]  ? __kasan_check_write+0x14/0x20\n[    6.512634]  ? mutex_lock+0x8f/0xe0\n[    6.512643]  ? __mutex_lock_slowpath+0x20/0x20\n[    6.512655]  ps2_command+0x52/0x90\n[    6.512670]  elantech_ps2_command+0x4f/0xc0 [psmouse]\n[    6.512734]  elantech_change_report_id+0x1e6/0x256 [psmouse]\n[    6.512799]  ? elantech_report_trackpoint.constprop.0.cold+0xd/0xd [psmouse]\n[    6.512863]  ? ps2_command+0x7f/0x90\n[    6.512877]  elantech_query_info.cold+0x6bd/0x9ed [psmouse]\n[    6.512943]  ? elantech_setup_ps2+0x460/0x460 [psmouse]\n[    6.513005]  ? psmouse_reset+0x69/0xb0 [psmouse]\n[    6.513064]  ? psmouse_attr_set_helper+0x2a0/0x2a0 [psmouse]\n[    6.513122]  ? phys_pmd_init+0x30e/0x521\n[    6.513137]  elantech_init+0x8a/0x200 [psmouse]\n[    6.513200]  ? elantech_init_ps2+0xf0/0xf0 [psmouse]\n[    6.513249]  ? elantech_query_info+0x440/0x440 [psmouse]\n[    6.513296]  ? synaptics_send_cmd+0x60/0x60 [psmouse]\n[    6.513342]  ? elantech_query_info+0x440/0x440 [psmouse]\n[    6.513388]  ? psmouse_try_protocol+0x11e/0x170 [psmouse]\n[    6.513432]  psmouse_extensions+0x65d/0x6e0 [psmouse]\n[    6.513476]  ? psmouse_try_protocol+0x170/0x170 [psmouse]\n[    6.513519]  ? mutex_unlock+0x22/0x40\n[    6.513526]  ? ps2_command+0x7f/0x90\n[    6.513536]  ? psmouse_probe+0xa3/0xf0 [psmouse]\n[    6.513580]  psmouse_switch_protocol+0x27d/0x2e0 [psmouse]\n[    6.513624]  psmouse_connect+0x272/0x530 [psmouse]\n[    6.513669]  serio_driver_probe+0x55/0x70\n[    6.513679]  really_probe+0x190/0x720\n[    6.513689]  driver_probe_device+0x160/0x1f0\n[    6.513697]  device_driver_attach+0x119/0x130\n[    6.513705]  ? device_driver_attach+0x130/0x130\n[    6.513713]  __driver_attach+0xe7/0x1a0\n[    6.513720]  ? device_driver_attach+0x130/0x130\n[    6.513728]  bus_for_each_dev+0xfb/0x150\n[    6.513738]  ? subsys_dev_iter_exit+0x10/0x10\n[    6.513748]  ? _raw_write_unlock_bh+0x30/0x30\n[    6.513757]  driver_attach+0x2d/0x40\n[    6.513764]  serio_handle_event+0x199/0x3d0\n[    6.513775]  process_one_work+0x471/0x740\n[    6.513785]  worker_thread+0x2d2/0x790\n[    6.513794]  ? process_one_work+0x740/0x740\n[    6.513802]  kthread+0x1b4/0x1e0\n[    6.513809]  ? set_kthread_struct+0x80/0x80\n[    6.513816]  ret_from_fork+0x22/0x30\n\n[    6.513832] The buggy address belongs to the page:\n[    6.513838] page:00000000bc35e189 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1024d7\n[    6.513847] flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff)\n[    6.513860] raw: 0\n---truncated---"
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        "dateUpdated": "2026-05-23T15:19:18.641Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be"
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          "url": "https://git.kernel.org/stable/c/676c572439e58b7ee6b7ca3f1e5595382921045c"
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          "url": "https://git.kernel.org/stable/c/dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b"
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          "url": "https://git.kernel.org/stable/c/1d72d9f960ccf1052a0630a68c3d358791dbdaaa"
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      "title": "Input: elantech - fix stack out of bound access in elantech_change_report_id()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47097",
    "datePublished": "2024-03-04T18:10:49.194Z",
    "dateReserved": "2024-02-29T22:33:44.301Z",
    "dateUpdated": "2026-05-23T15:19:18.641Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2021-47097",
      "date": "2026-07-22",
      "epss": "0.00413",
      "percentile": "0.33717"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47097\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-03-04T18:15:08.017\",\"lastModified\":\"2026-06-17T04:16:28.193\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nInput: elantech - fix stack out of bound access in elantech_change_report_id()\\n\\nThe array param[] in elantech_change_report_id() must be at least 3\\nbytes, because elantech_read_reg_params() is calling ps2_command() with\\nPSMOUSE_CMD_GETINFO, that is going to access 3 bytes from param[], but\\nit\u0027s defined in the stack as an array of 2 bytes, therefore we have a\\npotential stack out-of-bounds access here, also confirmed by KASAN:\\n\\n[    6.512374] BUG: KASAN: stack-out-of-bounds in __ps2_command+0x372/0x7e0\\n[    6.512397] Read of size 1 at addr ffff8881024d77c2 by task kworker/2:1/118\\n\\n[    6.512416] CPU: 2 PID: 118 Comm: kworker/2:1 Not tainted 5.13.0-22-generic #22+arighi20211110\\n[    6.512428] Hardware name: LENOVO 20T8000QGE/20T8000QGE, BIOS R1AET32W (1.08 ) 08/14/2020\\n[    6.512436] Workqueue: events_long serio_handle_event\\n[    6.512453] Call Trace:\\n[    6.512462]  show_stack+0x52/0x58\\n[    6.512474]  dump_stack+0xa1/0xd3\\n[    6.512487]  print_address_description.constprop.0+0x1d/0x140\\n[    6.512502]  ? __ps2_command+0x372/0x7e0\\n[    6.512516]  __kasan_report.cold+0x7d/0x112\\n[    6.512527]  ? _raw_write_lock_irq+0x20/0xd0\\n[    6.512539]  ? __ps2_command+0x372/0x7e0\\n[    6.512552]  kasan_report+0x3c/0x50\\n[    6.512564]  __asan_load1+0x6a/0x70\\n[    6.512575]  __ps2_command+0x372/0x7e0\\n[    6.512589]  ? ps2_drain+0x240/0x240\\n[    6.512601]  ? dev_printk_emit+0xa2/0xd3\\n[    6.512612]  ? dev_vprintk_emit+0xc5/0xc5\\n[    6.512621]  ? __kasan_check_write+0x14/0x20\\n[    6.512634]  ? mutex_lock+0x8f/0xe0\\n[    6.512643]  ? __mutex_lock_slowpath+0x20/0x20\\n[    6.512655]  ps2_command+0x52/0x90\\n[    6.512670]  elantech_ps2_command+0x4f/0xc0 [psmouse]\\n[    6.512734]  elantech_change_report_id+0x1e6/0x256 [psmouse]\\n[    6.512799]  ? elantech_report_trackpoint.constprop.0.cold+0xd/0xd [psmouse]\\n[    6.512863]  ? ps2_command+0x7f/0x90\\n[    6.512877]  elantech_query_info.cold+0x6bd/0x9ed [psmouse]\\n[    6.512943]  ? elantech_setup_ps2+0x460/0x460 [psmouse]\\n[    6.513005]  ? psmouse_reset+0x69/0xb0 [psmouse]\\n[    6.513064]  ? psmouse_attr_set_helper+0x2a0/0x2a0 [psmouse]\\n[    6.513122]  ? phys_pmd_init+0x30e/0x521\\n[    6.513137]  elantech_init+0x8a/0x200 [psmouse]\\n[    6.513200]  ? elantech_init_ps2+0xf0/0xf0 [psmouse]\\n[    6.513249]  ? elantech_query_info+0x440/0x440 [psmouse]\\n[    6.513296]  ? synaptics_send_cmd+0x60/0x60 [psmouse]\\n[    6.513342]  ? elantech_query_info+0x440/0x440 [psmouse]\\n[    6.513388]  ? psmouse_try_protocol+0x11e/0x170 [psmouse]\\n[    6.513432]  psmouse_extensions+0x65d/0x6e0 [psmouse]\\n[    6.513476]  ? psmouse_try_protocol+0x170/0x170 [psmouse]\\n[    6.513519]  ? mutex_unlock+0x22/0x40\\n[    6.513526]  ? ps2_command+0x7f/0x90\\n[    6.513536]  ? psmouse_probe+0xa3/0xf0 [psmouse]\\n[    6.513580]  psmouse_switch_protocol+0x27d/0x2e0 [psmouse]\\n[    6.513624]  psmouse_connect+0x272/0x530 [psmouse]\\n[    6.513669]  serio_driver_probe+0x55/0x70\\n[    6.513679]  really_probe+0x190/0x720\\n[    6.513689]  driver_probe_device+0x160/0x1f0\\n[    6.513697]  device_driver_attach+0x119/0x130\\n[    6.513705]  ? device_driver_attach+0x130/0x130\\n[    6.513713]  __driver_attach+0xe7/0x1a0\\n[    6.513720]  ? device_driver_attach+0x130/0x130\\n[    6.513728]  bus_for_each_dev+0xfb/0x150\\n[    6.513738]  ? subsys_dev_iter_exit+0x10/0x10\\n[    6.513748]  ? _raw_write_unlock_bh+0x30/0x30\\n[    6.513757]  driver_attach+0x2d/0x40\\n[    6.513764]  serio_handle_event+0x199/0x3d0\\n[    6.513775]  process_one_work+0x471/0x740\\n[    6.513785]  worker_thread+0x2d2/0x790\\n[    6.513794]  ? process_one_work+0x740/0x740\\n[    6.513802]  kthread+0x1b4/0x1e0\\n[    6.513809]  ? set_kthread_struct+0x80/0x80\\n[    6.513816]  ret_from_fork+0x22/0x30\\n\\n[    6.513832] The buggy address belongs to the page:\\n[    6.513838] page:00000000bc35e189 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1024d7\\n[    6.513847] flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff)\\n[    6.513860] raw: 0\\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Entrada: elantech - arregla la pila fuera del acceso limitado en elantech_change_report_id() El par\u00e1metro de matriz[] en elantech_change_report_id() debe tener al menos 3 bytes, porque elantech_read_reg_params() est\u00e1 llamando a ps2_command( ) con PSMOUSE_CMD_GETINFO, que acceder\u00e1 a 3 bytes desde param[], pero est\u00e1 definido en la pila como una matriz de 2 bytes, por lo tanto, aqu\u00ed tenemos un posible acceso fuera de los l\u00edmites a la pila, tambi\u00e9n confirmado por KASAN: [6.512374 ] ERROR: KASAN: pila fuera de los l\u00edmites en __ps2_command+0x372/0x7e0 [6.512397] Lectura del tama\u00f1o 1 en la direcci\u00f3n ffff8881024d77c2 por tarea kworker/2:1/118 [6.512416] CPU: 2 PID: 118 Comm: kworker/ 2:1 No contaminado 5.13.0-22-generic #22+arighi20211110 [6.512428] Nombre de hardware: LENOVO 20T8000QGE/20T8000QGE, BIOS R1AET32W (1.08) 14/08/2020 [6.512436] Cola de trabajo: events_long serio_handle_even t [6.512453] Seguimiento de llamadas: [6.512462] show_stack+0x52/0x58 [6.512474] dump_stack+0xa1/0xd3 [6.512487] print_address_description.constprop.0+0x1d/0x140 [6.512502]? __ps2_command+0x372/0x7e0 [6.512516] __kasan_report.cold+0x7d/0x112 [6.512527] ? _raw_write_lock_irq+0x20/0xd0 [6.512539]? __ps2_command+0x372/0x7e0 [ 6.512552] kasan_report+0x3c/0x50 [ 6.512564] __asan_load1+0x6a/0x70 [ 6.512575] __ps2_command+0x372/0x7e0 [ 6.512589] ? ps2_drain+0x240/0x240 [6.512601]? dev_printk_emit+0xa2/0xd3 [6.512612]? dev_vprintk_emit+0xc5/0xc5 [6.512621]? __kasan_check_write+0x14/0x20 [6.512634]? mutex_lock+0x8f/0xe0 [6.512643]? __mutex_lock_slowpath+0x20/0x20 [ 6.512655] ps2_command+0x52/0x90 [ 6.512670] elantech_ps2_command+0x4f/0xc0 [psmouse] [ 6.512734] elantech_change_report_id+0x1e6/0x256 [psmouse] [ 6.512799] ? elantech_report_trackpoint.constprop.0.cold+0xd/0xd [psmouse] [6.512863]? ps2_command+0x7f/0x90 [6.512877] elantech_query_info.cold+0x6bd/0x9ed [psmouse] [6.512943] ? elantech_setup_ps2+0x460/0x460 [psmouse] [6.513005]? psmouse_reset+0x69/0xb0 [psmouse] [6.513064]? psmouse_attr_set_helper+0x2a0/0x2a0 [psmouse] [6.513122]? phys_pmd_init+0x30e/0x521 [6.513137] elantech_init+0x8a/0x200 [psmouse] [6.513200]? elantech_init_ps2+0xf0/0xf0 [psmouse] [6.513249]? elantech_query_info+0x440/0x440 [psmouse] [6.513296]? synaptics_send_cmd+0x60/0x60 [psmouse] [6.513342]? elantech_query_info+0x440/0x440 [psmouse] [6.513388]? psmouse_try_protocol+0x11e/0x170 [psmouse] [6.513432] psmouse_extensions+0x65d/0x6e0 [psmouse] [6.513476]? psmouse_try_protocol+0x170/0x170 [psmouse] [6.513519]? mutex_unlock+0x22/0x40 [6.513526]? ps2_command+0x7f/0x90 [6.513536]? psmouse_probe+0xa3/0xf0 [psmouse] [ 6.513580] psmouse_switch_protocol+0x27d/0x2e0 [psmouse] [ 6.513624] psmouse_connect+0x272/0x530 [psmouse] [ 6.513669] serio_driver_probe+0x55/0x70 [ 6.513679] realmente_probe+0x190/0x720 [ 6.513689] driver_probe_device +0x160/0x1f0 [6.513697] dispositivo_driver_attach+0x119/0x130 [6.513705] ? dispositivo_driver_attach+0x130/0x130 [6.513713] __driver_attach+0xe7/0x1a0 [6.513720]? device_driver_attach+0x130/0x130 [6.513728] bus_for_each_dev+0xfb/0x150 [6.513738]? subsys_dev_iter_exit+0x10/0x10 [6.513748]? _raw_write_unlock_bh+0x30/0x30 [ 6.513757] driver_attach+0x2d/0x40 [ 6.513764] serio_handle_event+0x199/0x3d0 [ 6.513775] Process_one_work+0x471/0x740 [ 6.513785] trabajador_thread+0x2d2 /0x790 [6.513794] ? Process_one_work+0x740/0x740 [6.513802] kthread+0x1b4/0x1e0 [6.513809]? set_kthread_struct+0x80/0x80 [6.513816] ret_from_fork+0x22/0x30 [6.513832] La direcci\u00f3n del error pertenece a la p\u00e1gina: [6.513838] p\u00e1gina:00000000bc35e189 refcount:0 mapcount:0 mapeo:0000000000000000 index:0x0 pfn:0x1024d7 [6.513847] banderas: 0x17ffffc0000000(nodo=0|zona=2|lastcpupid=0x1fffff) [6.513860] sin procesar: 0\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/input/mouse/elantech.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9e4815cf178561104881e5d687ef69396aca1c8d\",\"lessThan\":\"a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dde807b4a44273fa5f62c0cb308295e6d6642550\",\"lessThan\":\"676c572439e58b7ee6b7ca3f1e5595382921045c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e4c9062717feda88900b566463228d1c4910af6d\",\"lessThan\":\"dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e4c9062717feda88900b566463228d1c4910af6d\",\"lessThan\":\"1d72d9f960ccf1052a0630a68c3d358791dbdaaa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.4.103\",\"lessThan\":\"5.4.169\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.10.21\",\"lessThan\":\"5.10.89\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/input/mouse/elantech.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.169\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.89\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.12\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.16\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-03-06T20:23:43.853175Z\",\"id\":\"CVE-2021-47097\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.103\",\"versionEndExcluding\":\"5.4.169\",\"matchCriteriaId\":\"DDBC5C85-1295-4FF8-A68E-2A142F6BFED2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.21\",\"versionEndExcluding\":\"5.10.89\",\"matchCriteriaId\":\"10987117-BAEF-4BEB-8D19-BD9BB6E8BD33\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.12\",\"matchCriteriaId\":\"732BA914-7B3B-43CD-857F-8119106F6F71\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"357AA433-37E8-4323-BFB2-3038D6E4B414\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"A73429BA-C2D9-4D0C-A75F-06A1CA8B3983\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F621B5E3-E99D-49E7-90B9-EC3B77C95383\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.16:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"F7BFDCAA-1650-49AA-8462-407DD593F94F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.16:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"6EC9882F-866D-4ACB-8FBC-213D8D8436C8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.16:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"8A0915FE-A4AA-4C94-B783-CF29D81E7E54\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1d72d9f960ccf1052a0630a68c3d358791dbdaaa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Exploit\",\"Mailing List\",\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/676c572439e58b7ee6b7ca3f1e5595382921045c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Exploit\",\"Mailing List\",\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Exploit\",\"Mailing List\",\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Exploit\",\"Mailing List\",\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1d72d9f960ccf1052a0630a68c3d358791dbdaaa\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Mailing List\",\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/676c572439e58b7ee6b7ca3f1e5595382921045c\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Mailing List\",\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Mailing List\",\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Mailing List\",\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:49:51+00:00",
      "cve": "CVE-2021-47097",
      "id": "CVE-2021-47097",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:fixed": "150",
      "product_status:known_affected": "150",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Input: elantech - fix stack out of bound access in elantech_change_report_id()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47097.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/676c572439e58b7ee6b7ca3f1e5595382921045c\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/1d72d9f960ccf1052a0630a68c3d358791dbdaaa\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:24:39.882Z\"}}, {\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47097\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-03-06T20:23:43.853175Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-23T19:01:16.201Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"Input: elantech - fix stack out of bound access in elantech_change_report_id()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"9e4815cf178561104881e5d687ef69396aca1c8d\", \"lessThan\": \"a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dde807b4a44273fa5f62c0cb308295e6d6642550\", \"lessThan\": \"676c572439e58b7ee6b7ca3f1e5595382921045c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e4c9062717feda88900b566463228d1c4910af6d\", \"lessThan\": \"dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e4c9062717feda88900b566463228d1c4910af6d\", \"lessThan\": \"1d72d9f960ccf1052a0630a68c3d358791dbdaaa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.4.103\", \"lessThan\": \"5.4.169\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.10.21\", \"lessThan\": \"5.10.89\", \"versionType\": \"semver\"}], \"programFiles\": [\"drivers/input/mouse/elantech.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.11\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.11\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.169\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.89\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/input/mouse/elantech.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be\"}, {\"url\": \"https://git.kernel.org/stable/c/676c572439e58b7ee6b7ca3f1e5595382921045c\"}, {\"url\": \"https://git.kernel.org/stable/c/dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b\"}, {\"url\": \"https://git.kernel.org/stable/c/1d72d9f960ccf1052a0630a68c3d358791dbdaaa\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nInput: elantech - fix stack out of bound access in elantech_change_report_id()\\n\\nThe array param[] in elantech_change_report_id() must be at least 3\\nbytes, because elantech_read_reg_params() is calling ps2_command() with\\nPSMOUSE_CMD_GETINFO, that is going to access 3 bytes from param[], but\\nit\u0027s defined in the stack as an array of 2 bytes, therefore we have a\\npotential stack out-of-bounds access here, also confirmed by KASAN:\\n\\n[    6.512374] BUG: KASAN: stack-out-of-bounds in __ps2_command+0x372/0x7e0\\n[    6.512397] Read of size 1 at addr ffff8881024d77c2 by task kworker/2:1/118\\n\\n[    6.512416] CPU: 2 PID: 118 Comm: kworker/2:1 Not tainted 5.13.0-22-generic #22+arighi20211110\\n[    6.512428] Hardware name: LENOVO 20T8000QGE/20T8000QGE, BIOS R1AET32W (1.08 ) 08/14/2020\\n[    6.512436] Workqueue: events_long serio_handle_event\\n[    6.512453] Call Trace:\\n[    6.512462]  show_stack+0x52/0x58\\n[    6.512474]  dump_stack+0xa1/0xd3\\n[    6.512487]  print_address_description.constprop.0+0x1d/0x140\\n[    6.512502]  ? __ps2_command+0x372/0x7e0\\n[    6.512516]  __kasan_report.cold+0x7d/0x112\\n[    6.512527]  ? _raw_write_lock_irq+0x20/0xd0\\n[    6.512539]  ? __ps2_command+0x372/0x7e0\\n[    6.512552]  kasan_report+0x3c/0x50\\n[    6.512564]  __asan_load1+0x6a/0x70\\n[    6.512575]  __ps2_command+0x372/0x7e0\\n[    6.512589]  ? ps2_drain+0x240/0x240\\n[    6.512601]  ? dev_printk_emit+0xa2/0xd3\\n[    6.512612]  ? dev_vprintk_emit+0xc5/0xc5\\n[    6.512621]  ? __kasan_check_write+0x14/0x20\\n[    6.512634]  ? mutex_lock+0x8f/0xe0\\n[    6.512643]  ? __mutex_lock_slowpath+0x20/0x20\\n[    6.512655]  ps2_command+0x52/0x90\\n[    6.512670]  elantech_ps2_command+0x4f/0xc0 [psmouse]\\n[    6.512734]  elantech_change_report_id+0x1e6/0x256 [psmouse]\\n[    6.512799]  ? elantech_report_trackpoint.constprop.0.cold+0xd/0xd [psmouse]\\n[    6.512863]  ? ps2_command+0x7f/0x90\\n[    6.512877]  elantech_query_info.cold+0x6bd/0x9ed [psmouse]\\n[    6.512943]  ? elantech_setup_ps2+0x460/0x460 [psmouse]\\n[    6.513005]  ? psmouse_reset+0x69/0xb0 [psmouse]\\n[    6.513064]  ? psmouse_attr_set_helper+0x2a0/0x2a0 [psmouse]\\n[    6.513122]  ? phys_pmd_init+0x30e/0x521\\n[    6.513137]  elantech_init+0x8a/0x200 [psmouse]\\n[    6.513200]  ? elantech_init_ps2+0xf0/0xf0 [psmouse]\\n[    6.513249]  ? elantech_query_info+0x440/0x440 [psmouse]\\n[    6.513296]  ? synaptics_send_cmd+0x60/0x60 [psmouse]\\n[    6.513342]  ? elantech_query_info+0x440/0x440 [psmouse]\\n[    6.513388]  ? psmouse_try_protocol+0x11e/0x170 [psmouse]\\n[    6.513432]  psmouse_extensions+0x65d/0x6e0 [psmouse]\\n[    6.513476]  ? psmouse_try_protocol+0x170/0x170 [psmouse]\\n[    6.513519]  ? mutex_unlock+0x22/0x40\\n[    6.513526]  ? ps2_command+0x7f/0x90\\n[    6.513536]  ? psmouse_probe+0xa3/0xf0 [psmouse]\\n[    6.513580]  psmouse_switch_protocol+0x27d/0x2e0 [psmouse]\\n[    6.513624]  psmouse_connect+0x272/0x530 [psmouse]\\n[    6.513669]  serio_driver_probe+0x55/0x70\\n[    6.513679]  really_probe+0x190/0x720\\n[    6.513689]  driver_probe_device+0x160/0x1f0\\n[    6.513697]  device_driver_attach+0x119/0x130\\n[    6.513705]  ? device_driver_attach+0x130/0x130\\n[    6.513713]  __driver_attach+0xe7/0x1a0\\n[    6.513720]  ? device_driver_attach+0x130/0x130\\n[    6.513728]  bus_for_each_dev+0xfb/0x150\\n[    6.513738]  ? subsys_dev_iter_exit+0x10/0x10\\n[    6.513748]  ? _raw_write_unlock_bh+0x30/0x30\\n[    6.513757]  driver_attach+0x2d/0x40\\n[    6.513764]  serio_handle_event+0x199/0x3d0\\n[    6.513775]  process_one_work+0x471/0x740\\n[    6.513785]  worker_thread+0x2d2/0x790\\n[    6.513794]  ? process_one_work+0x740/0x740\\n[    6.513802]  kthread+0x1b4/0x1e0\\n[    6.513809]  ? set_kthread_struct+0x80/0x80\\n[    6.513816]  ret_from_fork+0x22/0x30\\n\\n[    6.513832] The buggy address belongs to the page:\\n[    6.513838] page:00000000bc35e189 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1024d7\\n[    6.513847] flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff)\\n[    6.513860] raw: 0\\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.169\", \"versionStartIncluding\": \"5.4.103\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.89\", \"versionStartIncluding\": \"5.10.21\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.12\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\", \"versionStartIncluding\": \"5.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:19:18.641Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47097\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:19:18.641Z\", \"dateReserved\": \"2024-02-29T22:33:44.301Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-04T18:10:49.194Z\", \"assignerShortName\": \"Linux\"}",
      "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

Author Source Type Date Other

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.