NVD Vulnerability Detail
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CVE-2026-31623
Summary

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

net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()

A malicious USB device claiming to be a CDC Phonet modem can overflow
the skb_shared_info->frags[] array by sending an unbounded sequence of
full-page bulk transfers.

Drop the skb and increment the length error when the frag limit is
reached. This matches the same fix that commit f0813bcd2d9d ("net:
wwan: t7xx: fix potential skb->frags overflow in RX path") did for the
t7xx driver.

Publication Date April 25, 2026, 12:16 a.m.
Registration Date April 25, 2026, 4:07 a.m.
Last Update April 25, 2026, 2:51 a.m.
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