NVD

CVE-2021-47097 Detail

Description

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---

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score: 7.1 HIGH

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://git.kernel.org/stable/c/1d72d9f960ccf1052a0630a68c3d358791dbdaaa	CVE, kernel.org	Exploit Mailing List Patch
https://git.kernel.org/stable/c/676c572439e58b7ee6b7ca3f1e5595382921045c	CVE, kernel.org	Exploit Mailing List Patch
https://git.kernel.org/stable/c/a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be	CVE, kernel.org	Exploit Mailing List Patch
https://git.kernel.org/stable/c/dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b	CVE, kernel.org	Exploit Mailing List Patch

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-125	Out-of-bounds Read	NIST

Known Affected Software Configurations Switch to CPE 2.2

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Change History

7 change records found show changes

CVE Modified by kernel.org 6/17/2026 12:16:28 AM

Action

Type

Old Value

New Value

Added

Affected

[{"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"}]}]

Initial Analysis by NIST 2/14/2025 9:52:13 AM

Action	Type	Old Value	New Value
Added	CVSS V3.1		NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Added	CWE		NIST CWE-125
Added	CPE Configuration		OR cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 5.4.103 up to (excluding) 5.4.169 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 5.10.21 up to (excluding) 5.10.89 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 5.11 up to (excluding) 5.15.12 cpe:2.3:o:linux:linux_kernel:5.16:rc1::::::* cpe:2.3:o:linux:linux_kernel:5.16:rc2::::::* cpe:2.3:o:linux:linux_kernel:5.16:rc3::::::* cpe:2.3:o:linux:linux_kernel:5.16:rc4::::::* cpe:2.3:o:linux:linux_kernel:5.16:rc5::::::* cpe:2.3:o:linux:linux_kernel:5.16:rc6::::::*
Changed	Reference Type	https://git.kernel.org/stable/c/1d72d9f960ccf1052a0630a68c3d358791dbdaaa No Types Assigned	https://git.kernel.org/stable/c/1d72d9f960ccf1052a0630a68c3d358791dbdaaa Exploit, Mailing List, Patch
Changed	Reference Type	https://git.kernel.org/stable/c/1d72d9f960ccf1052a0630a68c3d358791dbdaaa No Types Assigned	https://git.kernel.org/stable/c/1d72d9f960ccf1052a0630a68c3d358791dbdaaa Exploit, Mailing List, Patch
Changed	Reference Type	https://git.kernel.org/stable/c/676c572439e58b7ee6b7ca3f1e5595382921045c No Types Assigned	https://git.kernel.org/stable/c/676c572439e58b7ee6b7ca3f1e5595382921045c Exploit, Mailing List, Patch
Changed	Reference Type	https://git.kernel.org/stable/c/676c572439e58b7ee6b7ca3f1e5595382921045c No Types Assigned	https://git.kernel.org/stable/c/676c572439e58b7ee6b7ca3f1e5595382921045c Exploit, Mailing List, Patch
Changed	Reference Type	https://git.kernel.org/stable/c/a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be No Types Assigned	https://git.kernel.org/stable/c/a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be Exploit, Mailing List, Patch
Changed	Reference Type	https://git.kernel.org/stable/c/a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be No Types Assigned	https://git.kernel.org/stable/c/a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be Exploit, Mailing List, Patch
Changed	Reference Type	https://git.kernel.org/stable/c/dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b No Types Assigned	https://git.kernel.org/stable/c/dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b Exploit, Mailing List, Patch
Changed	Reference Type	https://git.kernel.org/stable/c/dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b No Types Assigned	https://git.kernel.org/stable/c/dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b Exploit, Mailing List, Patch

CVE Modified by CVE 11/21/2024 1:35:23 AM

Action	Type	New Value
Added	Reference	https://git.kernel.org/stable/c/1d72d9f960ccf1052a0630a68c3d358791dbdaaa
Added	Reference	https://git.kernel.org/stable/c/676c572439e58b7ee6b7ca3f1e5595382921045c
Added	Reference	https://git.kernel.org/stable/c/a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be
Added	Reference	https://git.kernel.org/stable/c/dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b

New CVE Received from kernel.org 3/04/2024 1:15:08 PM

Action	Type	New Value
Added	Description	Record truncated, showing 2048 of 3998 characters. View Entire Change Record 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] [ 6.51
Added	Reference	Linux https://git.kernel.org/stable/c/1d72d9f960ccf1052a0630a68c3d358791dbdaaa [No types assigned]
Added	Reference	Linux https://git.kernel.org/stable/c/676c572439e58b7ee6b7ca3f1e5595382921045c [No types assigned]
Added	Reference	Linux https://git.kernel.org/stable/c/a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be [No types assigned]
Added	Reference	Linux https://git.kernel.org/stable/c/dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b [No types assigned]

Quick Info

CVE Dictionary Entry:
CVE-2021-47097
NVD Published Date:
03/04/2024
NVD Last Modified:
06/17/2026
Source:
kernel.org

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Information Technology Laboratory

National Vulnerability Database

National Vulnerability Database

CVE-2021-47097 Detail

Description

Metrics

References to Advisories, Solutions, and Tools

Weakness Enumeration

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Change History

CVE Modified by CISA-ADP 6/17/2026 12:16:28 AM

CVE Modified by kernel.org 6/17/2026 12:16:28 AM

Initial Analysis by NIST 2/14/2025 9:52:13 AM

CVE Modified by CVE 11/21/2024 1:35:23 AM

CVE Modified by kernel.org 5/28/2024 4:15:39 PM

CVE Modified by kernel.org 5/14/2024 5:46:23 AM

New CVE Received from kernel.org 3/04/2024 1:15:08 PM

Quick Info