Description
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").
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= b91cd1440870f7a0649e570498b7b93caf9f781c, < 3d7f7e0c842242878c24b2facff8d6eda23ee1e9; >= b91cd1440870f7a0649e570498b7b93caf9f781c, < b5ec49fa198bd08967a3102bd41f53ccadce72c9; >= b91cd1440870f7a0649e570498b7b93caf9f781c, < 7424f0287da73d3d8c5fa5e9d25d26fce762708e; >= b91cd1440870f7a0649e570498b7b93caf9f781c, < 9ceff1251904901b0b4e5fe6350fcaffa368ce83; >= b91cd1440870f7a0649e570498b7b93caf9f781c, < c9315ce9da3632c591666a29de82d3e92d46bec1; >= b91cd1440870f7a0649e570498b7b93caf9f781c, < 4e476c25bfcab0535ba7c76a903ae77ca8747711; >= b91cd1440870f7a0649e570498b7b93caf9f781c, < bd44ce09b9b569f49ed13e2d87d23d853fc7d6a7; >= b91cd1440870f7a0649e570498b7b93caf9f781c, < 66f7471c4042e4eb300e30b5b9d87d1406862673; >= b91cd1440870f7a0649e570498b7b93caf9f781c, < c088d5dd2fffb4de1fb8e7f57751c8b82942180a |
| Linux | Linux | 2.6.32 |
References
- https://git.kernel.org/stable/c/3d7f7e0c842242878c24b2facff8d6eda23ee1e9
- https://git.kernel.org/stable/c/4e476c25bfcab0535ba7c76a903ae77ca8747711Patch
- https://git.kernel.org/stable/c/66f7471c4042e4eb300e30b5b9d87d1406862673Patch
- https://git.kernel.org/stable/c/7424f0287da73d3d8c5fa5e9d25d26fce762708e
- https://git.kernel.org/stable/c/9ceff1251904901b0b4e5fe6350fcaffa368ce83Patch
- https://git.kernel.org/stable/c/b5ec49fa198bd08967a3102bd41f53ccadce72c9
- https://git.kernel.org/stable/c/bd44ce09b9b569f49ed13e2d87d23d853fc7d6a7Patch
- https://git.kernel.org/stable/c/c088d5dd2fffb4de1fb8e7f57751c8b82942180aPatch
- https://git.kernel.org/stable/c/c9315ce9da3632c591666a29de82d3e92d46bec1Patch
Timeline
- Published
- Apr 24, 2026
- Last modified
- Nov 11, 2026
- NVD status
- Modified