CVE-2026-31623

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

State: Published
Severity: Not scored
Published: Apr 24, 2026
Updated: Jun 14, 2026
Reserved: Mar 9, 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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	87cf65601e1709e57f7e28f0f7b3eb0a992c1782 to before 6807ff49bf796b3823b1e29f97b69316a40a9a94Affected 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 to before 0c5c65a17db729fc63ab656bdaaf0e675a9dbeacAffected 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 to before 6053620fdbcd89fa7e755644efdaab78e0daaae7Affected 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 to before d4e1946bea8d6441835eb3fd09b19237ba366a6fAffected 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 to before a23b1b1aaf41e174181d5853a70e65d4d01e648cAffected 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 to before c183d5775129a0a7495bd61a6e57ec230dcf01e5Affected 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 to before ebf75c6301c4972a87542ebf2d994c6391eb5d46Affected 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 to before 9989938d13cc5ba8447eeed5a61acfcf61bc6801Affected 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 to before 600dc40554dc5ad1e6f3af51f700228033f43ea7Affected
LinuxLinux	2.6.31Affected before 2.6.31Not affected 5.10.258 through 5.10.Not affected 5.15.209 through 5.15.Not affected 6.1.175 through 6.1.Not affected 6.6.136 through 6.6.Not affected 6.12.83 through 6.12.Not affected 6.18.24 through 6.18.Not affected 6.19.14 through 6.19.Not affected 7.0.1 through 7.0.Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

87cf65601e1709e57f7e28f0f7b3eb0a992c1782 to before 6807ff49bf796b3823b1e29f97b69316a40a9a94Affected
87cf65601e1709e57f7e28f0f7b3eb0a992c1782 to before 0c5c65a17db729fc63ab656bdaaf0e675a9dbeacAffected
87cf65601e1709e57f7e28f0f7b3eb0a992c1782 to before 6053620fdbcd89fa7e755644efdaab78e0daaae7Affected
87cf65601e1709e57f7e28f0f7b3eb0a992c1782 to before d4e1946bea8d6441835eb3fd09b19237ba366a6fAffected
87cf65601e1709e57f7e28f0f7b3eb0a992c1782 to before a23b1b1aaf41e174181d5853a70e65d4d01e648cAffected
87cf65601e1709e57f7e28f0f7b3eb0a992c1782 to before c183d5775129a0a7495bd61a6e57ec230dcf01e5Affected
87cf65601e1709e57f7e28f0f7b3eb0a992c1782 to before ebf75c6301c4972a87542ebf2d994c6391eb5d46Affected
87cf65601e1709e57f7e28f0f7b3eb0a992c1782 to before 9989938d13cc5ba8447eeed5a61acfcf61bc6801Affected
87cf65601e1709e57f7e28f0f7b3eb0a992c1782 to before 600dc40554dc5ad1e6f3af51f700228033f43ea7Affected

LinuxLinux

2.6.31Affected
before 2.6.31Not affected
5.10.258 through 5.10.*Not affected
5.15.209 through 5.15.*Not affected
6.1.175 through 6.1.*Not affected
6.6.136 through 6.6.*Not affected
6.12.83 through 6.12.*Not affected
6.18.24 through 6.18.*Not affected
6.19.14 through 6.19.*Not affected
7.0.1 through 7.0.*Not affected
7.1 and laterNot affected

References

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