Medium 5.5Published Apr 24, 2026

CVE-2026-31616usb: gadget: f_phonet: fix skb frags[] overflow in pn_rx_complete()

Updated under an hour ago (Oct 28, 2026, 2:50 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_phonet: fix skb frags[] overflow in pn_rx_complete() A broken/bored/mean USB host can overflow the skb_shared_info->frags[] array on a Linux gadget exposing a Phonet function by sending an unbounded sequence of full-page OUT transfers. pn_rx_complete() finalizes the skb only when req->actual < req->length, where req->length is set to PAGE_SIZE by the gadget. If the host always sends exactly PAGE_SIZE bytes per transfer, fp->rx.skb will never be reset and each completion will add another fragment via skb_add_rx_frag(). Once nr_frags exceeds MAX_SKB_FRAGS (default 17), subsequent frag stores overwrite memory adjacent to the shinfo on the heap. Drop the skb and account a length error when the frag limit is reached, matching the fix applied in t7xx by commit f0813bcd2d9d ("net: wwan: t7xx: fix potential skb->frags overflow in RX path").

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Jun 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from b91cd1440870f7a0649e570498b7b93caf9f781c before 3d7f7e0c842242878c24b2facff8d6eda23ee1e9; from b91cd1440870f7a0649e570498b7b93caf9f781c before b5ec49fa198bd08967a3102bd41f53ccadce72c9; from b91cd1440870f7a0649e570498b7b93caf9f781c before 7424f0287da73d3d8c5fa5e9d25d26fce762708e; from b91cd1440870f7a0649e570498b7b93caf9f781c before 9ceff1251904901b0b4e5fe6350fcaffa368ce83; from b91cd1440870f7a0649e570498b7b93caf9f781c before c9315ce9da3632c591666a29de82d3e92d46bec1; from b91cd1440870f7a0649e570498b7b93caf9f781c before 4e476c25bfcab0535ba7c76a903ae77ca8747711; from b91cd1440870f7a0649e570498b7b93caf9f781c before bd44ce09b9b569f49ed13e2d87d23d853fc7d6a7; from b91cd1440870f7a0649e570498b7b93caf9f781c before 66f7471c4042e4eb300e30b5b9d87d1406862673; and 1 more ranges	CNA record
linux linux_kernel linux:linux_kernel	from 2.6.32 before 6.6.136; from 6.7 before 6.12.83; from 6.13 before 6.18.24; from 6.19 before 6.19.14; from 7.0 before 7.0.1	NVD

References

References

https://git.kernel.org/stable/c/3d7f7e0c842242878c24b2facff8d6eda23ee1e9
https://git.kernel.org/stable/c/b5ec49fa198bd08967a3102bd41f53ccadce72c9
https://git.kernel.org/stable/c/7424f0287da73d3d8c5fa5e9d25d26fce762708e
https://git.kernel.org/stable/c/9ceff1251904901b0b4e5fe6350fcaffa368ce83	patch
https://git.kernel.org/stable/c/c9315ce9da3632c591666a29de82d3e92d46bec1	patch
https://git.kernel.org/stable/c/4e476c25bfcab0535ba7c76a903ae77ca8747711	patch
https://git.kernel.org/stable/c/bd44ce09b9b569f49ed13e2d87d23d853fc7d6a7	patch
https://git.kernel.org/stable/c/66f7471c4042e4eb300e30b5b9d87d1406862673	patch
https://git.kernel.org/stable/c/c088d5dd2fffb4de1fb8e7f57751c8b82942180a	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.