CVE-2026-31623

MediumCVSS 5.5/10Last modified Nov 11, 2026

Description

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.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-120

Affected software

VendorProductVersions
LinuxLinux>= 87cf65601e1709e57f7e28f0f7b3eb0a992c1782, < 6807ff49bf796b3823b1e29f97b69316a40a9a94; >= 87cf65601e1709e57f7e28f0f7b3eb0a992c1782, < 0c5c65a17db729fc63ab656bdaaf0e675a9dbeac; >= 87cf65601e1709e57f7e28f0f7b3eb0a992c1782, < 6053620fdbcd89fa7e755644efdaab78e0daaae7; >= 87cf65601e1709e57f7e28f0f7b3eb0a992c1782, < d4e1946bea8d6441835eb3fd09b19237ba366a6f; >= 87cf65601e1709e57f7e28f0f7b3eb0a992c1782, < a23b1b1aaf41e174181d5853a70e65d4d01e648c; >= 87cf65601e1709e57f7e28f0f7b3eb0a992c1782, < c183d5775129a0a7495bd61a6e57ec230dcf01e5; >= 87cf65601e1709e57f7e28f0f7b3eb0a992c1782, < ebf75c6301c4972a87542ebf2d994c6391eb5d46; >= 87cf65601e1709e57f7e28f0f7b3eb0a992c1782, < 9989938d13cc5ba8447eeed5a61acfcf61bc6801; >= 87cf65601e1709e57f7e28f0f7b3eb0a992c1782, < 600dc40554dc5ad1e6f3af51f700228033f43ea7
LinuxLinux2.6.31

References

Timeline

Published
Apr 24, 2026
Last modified
Nov 11, 2026
NVD status
Modified

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CVE-2026-31623: Medium severity, CVSS 5.5 | Vulnix