net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()
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.
02 / AFFECTED SOFTWARE
Affected packages
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/0c5c65a17db729fc63ab656bdaaf0e675a9dbeac
- https://git.kernel.org/stable/c/600dc40554dc5ad1e6f3af51f700228033f43ea7
- https://git.kernel.org/stable/c/6053620fdbcd89fa7e755644efdaab78e0daaae7
- https://git.kernel.org/stable/c/6807ff49bf796b3823b1e29f97b69316a40a9a94
- https://git.kernel.org/stable/c/9989938d13cc5ba8447eeed5a61acfcf61bc6801
- https://git.kernel.org/stable/c/a23b1b1aaf41e174181d5853a70e65d4d01e648c
- https://git.kernel.org/stable/c/c183d5775129a0a7495bd61a6e57ec230dcf01e5
- https://git.kernel.org/stable/c/d4e1946bea8d6441835eb3fd09b19237ba366a6f
- https://git.kernel.org/stable/c/ebf75c6301c4972a87542ebf2d994c6391eb5d46
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31623.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-31623