CVE-2026-80781: HID: core: fix OOB read of field->usage in hid_set_field()
HID: core: fix OOB read of field->usage in hidsetfield()
Affected Software
Remediation
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Fixed in 6.6.157.1-1 - Upgrade
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In Linux HID core, move the hid_dump_input(field->report->device, field->usage + offset, value) call in hid_set_field() below the if (offset >= field->report_count) bounds check, so the pointer is validated before dereference.
Event History
Frequently Asked Questions
Which systems are exposed to the out-of-bounds read path described here?
The described dereference occurs when the kernel is built with CONFIG_DEBUG_FS. The reported triggering path involves the picolcd framebuffer code calling hid_set_field() with offsets 11 through 42 while the relevant HID field has fewer usages.
What condition is needed to trigger the faulty access?
A HID field must be registered with fewer usage entries than an offset supplied to hid_set_field(). In the described picolcd framebuffer path, deferred-I/O work repeatedly triggers the read when the device's field cannot accommodate the fixed tile offsets.
How can an administrator recognize this issue in diagnostics?
KASAN can report a 4-byte out-of-bounds read. The faulty access is through hid_dump_input() resolving field->usage plus an offset beyond the usage array allocation.
Is the issue tied to a particular configuration or feature?
The out-of-bounds pointer is dereferenced by hid_dump_input() under CONFIG_DEBUG_FS. The described caller is picolcd_fb_send_tile(), so the relevant exposure path also depends on the picolcd framebuffer deferred-I/O activity.