GHSA-CV83-M6F4-PC7M
Vulnerability from github – Published: 2024-03-04 18:30 – Updated: 2025-02-14 15:31In 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---
{
"affected": [],
"aliases": [
"CVE-2021-47097"
],
"database_specific": {
"cwe_ids": [
"CWE-125"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-03-04T18:15:08Z",
"severity": "HIGH"
},
"details": "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---",
"id": "GHSA-cv83-m6f4-pc7m",
"modified": "2025-02-14T15:31:01Z",
"published": "2024-03-04T18:30:38Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47097"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1d72d9f960ccf1052a0630a68c3d358791dbdaaa"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/676c572439e58b7ee6b7ca3f1e5595382921045c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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