CVE-2026-72029

Technical Description

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

net: wwan: iosm: bound device offsets in the MUX downlink decoder

mux_dl_adb_decode() walks a chain of aggregated datagram tables using

offsets and lengths taken from the modem. first_table_index,

next_table_index, table_length, datagram_index and datagram_length are

all device supplied le values. Only first_table_index was checked, and

only for being non zero. The decoder then formed adth = block +

adth_index and read the table header and the datagram entries with no

bound against the received skb. A modem that reports an index or a

length past the downlink buffer makes the decoder read out of bounds.

The buffer is IPC_MEM_MAX_DL_MUX_LITE_BUF_SIZE and skb->len is at most

that, so skb->len is the real limit, but none of these in band offsets

were checked against it.

The table chain is also followed with no forward progress check. The loop

takes the next table from adth->next_table_index and stops only when that

rea

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

References