CVE-2026-43495

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

net: wwan: t7xx: validate portcount against message length in t7xxportenummsg_handler

t7xxportenummsghandler() uses the modem-supplied portcount field as a loop bound over portmsg->data[] without checking that the message buffer contains sufficient data. A modem sending port_count=65535 in a 12-byte buffer triggers a slab-out-of-bounds read of up to 262140 bytes.

Add a sizeof(*port_msg) check before accessing the port message header fields to guard against undersized messages.

Add a structsize() check after extracting portcount and before the loop.

In t7xxparsehostrtdata(), guard the rtfeature header read with a remaining-buffer check before accessing datalen, validate featdatalen against the actual remaining buffer to prevent OOB reads and signed integer overflow on offset.

Pass msglen from both call sites: skb->len at the DPMAIF path after skbpull(), and the validated featdatalen at the handshake path.