CVE-2026-63943

Description

In the Linux kernel, the following vulnerability has been resolved: Input: xpad - fix out-of-bounds access for Share button xpadone_process_packet() receives len directly from urb->actual_length and uses it to index the share-button byte at data[len - 18] or data[len - 26]. Since both len and data[0] are under the device's control, a broken controller can send a GIP_CMD_INPUT packet with actual_length < 18 (e.g. 5 bytes) and reach this code path, causing accesses beyond the actual array. Fix this by calculating the offset and checking bounds against the packet length.

References

• https://git.kernel.org/stable/c/37ec54abfdd63a63fd50734a9c4e4cbc1e5795af
• https://git.kernel.org/stable/c/6346b0895b574ce45f3747b9c508c72f70e6abef
• https://git.kernel.org/stable/c/6cdc46b38cf146ce81d4831b6472dbf7731849a2
• https://git.kernel.org/stable/c/9749db57233b396353ad5dee81eec9d9880c9246
• https://git.kernel.org/stable/c/bcfb4833cd4078a1a356ef451838b75cd233099e