Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 2.6.31, < 6.6.136 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/600dc40554dc5ad1e6f3af51f700228033f43ea7Patch
- https://git.kernel.org/stable/c/9989938d13cc5ba8447eeed5a61acfcf61bc6801Patch
- https://git.kernel.org/stable/c/a23b1b1aaf41e174181d5853a70e65d4d01e648cPatch
- https://git.kernel.org/stable/c/c183d5775129a0a7495bd61a6e57ec230dcf01e5Patch
- https://git.kernel.org/stable/c/d4e1946bea8d6441835eb3fd09b19237ba366a6fPatch
- https://git.kernel.org/stable/c/ebf75c6301c4972a87542ebf2d994c6391eb5d46Patch
FAQ
What is CVE-2026-31623?
CVE-2026-31623 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 overf...
How severe is CVE-2026-31623?
CVE-2026-31623 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31623?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.