CVE-2022-49976

published 2025-06-18

CVE-2022-49976: In the Linux kernel, the following vulnerability has been resolved: platform/x86: x86-android-tablets: Fix broken touchscreen on Chuwi Hi8 with Windows BIOS…

Priority P4 19 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

In the Linux kernel, the following vulnerability has been resolved:

platform/x86: x86-android-tablets: Fix broken touchscreen on Chuwi Hi8 with Windows BIOS

The x86-android-tablets handling for the Chuwi Hi8 is only necessary with
the Android BIOS and it is causing problems with the Windows BIOS version.

Specifically when trying to register the already present touchscreen
x86_acpi_irq_helper_get() calls acpi_unregister_gsi(), this breaks
the working of the touchscreen and also leads to an oops:

[ 14.248946] ------------[ cut here ]------------
[ 14.248954] remove_proc_entry: removing non-empty directory 'irq/75', leaking at least 'MSSL0001:00'
[ 14.248983] WARNING: CPU: 3 PID: 440 at fs/proc/generic.c:718 remove_proc_entry
...
[ 14.249293] unregister_irq_proc+0xe0/0x100
[ 14.249305] free_desc+0x29/0x70
[ 14.249312] irq_free_descs+0x4b/0x80
[ 14.249320] mp_unmap_irq+0x5c/0x60
[ 14.249329] acpi_unregister_gsi_ioapic+0x2a/0x40
[ 14.249338] x86_acpi_irq_helper_get+0x4b/0x190 [x86_android_tablets]
[ 14.249355] x86_android_tablet_init+0x178/0xe34 [x86_android_tablets]

Add an init callback for the Chuwi Hi8, which detects when the Windows BIOS
is in use and exits with -ENODEV in that case, fixing this.

Affected

10 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.0.2-1 (bookworm)	linux 6.0.2-1 (bookworm)
linux	linux	—	—
linux	linux	>= 84c2dcdd475f3f5d1d30c87404cafba4dd4b75ec < c77b724cddfb8ac1291a60e3e68937e62cbfc5e0	c77b724cddfb8ac1291a60e3e68937e62cbfc5e0
linux	linux	>= 84c2dcdd475f3f5d1d30c87404cafba4dd4b75ec < 2986c51540ed50ac654ffb5a772e546c02628c91	2986c51540ed50ac654ffb5a772e546c02628c91
linux	linux_kernel	—	—
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 6.0.2-1	6.0.2-1
linux	linux_kernel	>= 0 < 6.0.2-1	6.0.2-1
linux	linux_kernel	>= 0 < 6.0.2-1	6.0.2-1
linux	linux_kernel	>= 5.17.1 < 5.19.8	5.19.8

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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