CVE-2026-23172

/// Technical description

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

net: wwan: t7xx: fix potential skb->frags overflow in RX path

When receiving data in the DPMAIF RX path,

the t7xx_dpmaif_set_frag_to_skb() function adds

page fragments to an skb without checking if the number of

fragments has exceeded MAX_SKB_FRAGS. This could lead to a buffer overflow

in skb_shinfo(skb)->frags[] array, corrupting adjacent memory and

potentially causing kernel crashes or other undefined behavior.

This issue was identified through static code analysis by comparing with a

similar vulnerability fixed in the mt76 driver commit b102f0c522cf ("mt76:

fix array overflow on receiving too many fragments for a packet").

The vulnerability could be triggered if the modem firmware sends packets

with excessive fragments. While under normal protocol conditions (MTU 3080

bytes, BAT buffer 3584 bytes),

a single packet should not require additional

fragments, the kernel should not blindly trust firmware behavior.

Mal

/// 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