CVE-2026-98292Bluetooth: btmtksdio, btmtkuart: validate WMT event length before struct access

Official description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btmtksdio, btmtkuart: validate WMT event length before struct access btmtksdio.c and btmtkuart.c cast a received WMT event straight to struct btmtk_hci_wmt_evt and read its op/flag fields without checking the event is long enough to contain them, unlike btmtk.c. The FUNC_CTRL case then further casts to struct btmtk_hci_wmt_evt_funcc and reads its 2-byte status field, again without a length check. Firmware that sends a short or malformed WMT event makes both drivers read past the end of the received SKB. Mirror btmtk.c: validate the base WMT header with skb_pull_data() before touching any of its fields, and when a FUNC_CTRL event turns out to be the short, header-only form (a plain enable/disable ack with no status word), decode the result from the header's own flag byte instead (0 = success, otherwise failure). Verified setup on MT7920, MT7921, MT7922 and MT7925: no regression.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/5a5cfd8488c97e1b8939515429fe4c81e9f2df4f
• https://git.kernel.org/stable/c/8879e3e0a84a86954c855caceead4867e74a9a27