CVE-2026-74507

Status: UPDATED  |  Advisory ID: CVE-2026-74507

Key Details

Affected Products, Subsystems & Sectors

What to Know

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

Bluetooth: HIDP: validate numbered report payloads

When hidp_get_raw_report() waits for a numbered report,

hidp_process_data() compares the expected report number with skb->data[0].

A connected HIDP peer can reply with only a DATA transaction header,

leaving the skb empty after the header is removed.

KMSAN reports an uninitialized-value use in hidp_session_run(), with the

value originating in __alloc_skb() through vhci_write(). The transaction

header checks remove the empty-frame reports, but this report remains until

the payload check is added.

The comparison can also consume a peer-controlled byte beyond the declared

L2CAP PDU. A DATA | FEATURE response followed by an extra 0x01 byte made

the current code accept that byte as report ID 1 and complete

HIDIOCGFEATURE with a zero-byte result. With this change the malformed

response is rejected with -EIO, while a subsequent valid response still

succeeds.

Require a payload byte before comparing a numbered report ID. Unnumbered

reports continue to accept an empty payload. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References