CVE-2026-80918

/// Technical description

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

HID: core: fix number/pointer type confusion on long items

When fetch_item() is called by hid_scan_report() on an item with

HID_ITEM_TAG_LONG, it stores a pointer to the item data in

item->data.longdata instead of storing a value directly in

item->data.{u8/u16/u32}.

When item_udata() or item_sdata() encounters such an item, it incorrectly

assumes that the item is in short format, and therefore returns the lower

part of a kernel pointer reinterpreted as a number.

When a HID device is connected whose descriptor contains a

HID_GLOBAL_ITEM_TAG_REPORT_SIZE encoded in long format with size=4, this

causes the lower half of a kernel pointer to be printed into dmesg as a

number, like this:

hid (null): invalid report_size 107953555

To fix it, let item_udata() and item_sdata() verify that the item is in

short format.

Note that this bug only affects hid_scan_report(), while the main parsing

pass hid_parse_collections()

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References