CVE-2026-43495

Technical Description

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

net: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler

t7xx_port_enum_msg_handler() uses the modem-supplied port_count field as

a loop bound over port_msg->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 struct_size() check after extracting port_count and before the loop.

In t7xx_parse_host_rt_data(), guard the rt_feature header read with a

remaining-buffer check before accessing data_len, validate feat_data_len

against the actual remaining buffer to prevent OOB reads and signed

integer overflow on offset.

Pass msg_len from both call sites: skb->len at the DPMAIF path after

skb_pull(), and the validated feat_data_len at the

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

References