usb: gadget: f_phonet: fix skb frags[] overflow in pn_rx_complete()

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Summary

CVECVE-2026-31616
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:40 UTC
Updated2026-06-01 17:16:52 UTC
DescriptionIn 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").

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000180000 probability, percentile 0.048130000 (date 2026-04-27)

Problem Types: CWE-401

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b91cd1440870f7a0649e570498b7b93caf9f781c 3d7f7e0c842242878c24b2facff8d6eda23ee1e9 git Not specified
CNA Linux Linux affected b91cd1440870f7a0649e570498b7b93caf9f781c b5ec49fa198bd08967a3102bd41f53ccadce72c9 git Not specified
CNA Linux Linux affected b91cd1440870f7a0649e570498b7b93caf9f781c 7424f0287da73d3d8c5fa5e9d25d26fce762708e git Not specified
CNA Linux Linux affected b91cd1440870f7a0649e570498b7b93caf9f781c 9ceff1251904901b0b4e5fe6350fcaffa368ce83 git Not specified
CNA Linux Linux affected b91cd1440870f7a0649e570498b7b93caf9f781c c9315ce9da3632c591666a29de82d3e92d46bec1 git Not specified
CNA Linux Linux affected b91cd1440870f7a0649e570498b7b93caf9f781c 4e476c25bfcab0535ba7c76a903ae77ca8747711 git Not specified
CNA Linux Linux affected b91cd1440870f7a0649e570498b7b93caf9f781c bd44ce09b9b569f49ed13e2d87d23d853fc7d6a7 git Not specified
CNA Linux Linux affected b91cd1440870f7a0649e570498b7b93caf9f781c 66f7471c4042e4eb300e30b5b9d87d1406862673 git Not specified
CNA Linux Linux affected b91cd1440870f7a0649e570498b7b93caf9f781c c088d5dd2fffb4de1fb8e7f57751c8b82942180a git Not specified
CNA Linux Linux affected 2.6.32 Not specified
CNA Linux Linux unaffected 2.6.32 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0.1 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b5ec49fa198bd08967a3102bd41f53ccadce72c9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bd44ce09b9b569f49ed13e2d87d23d853fc7d6a7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3d7f7e0c842242878c24b2facff8d6eda23ee1e9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/66f7471c4042e4eb300e30b5b9d87d1406862673 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4e476c25bfcab0535ba7c76a903ae77ca8747711 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c088d5dd2fffb4de1fb8e7f57751c8b82942180a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9ceff1251904901b0b4e5fe6350fcaffa368ce83 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7424f0287da73d3d8c5fa5e9d25d26fce762708e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c9315ce9da3632c591666a29de82d3e92d46bec1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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