CVE-2026-31616 (GCVE-0-2026-31616)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-04-27 13:56
VLAI?
Title
usb: gadget: f_phonet: fix skb frags[] overflow in pn_rx_complete()
Summary
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").
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b91cd1440870f7a0649e570498b7b93caf9f781c , < 9ceff1251904901b0b4e5fe6350fcaffa368ce83 (git)
Affected: b91cd1440870f7a0649e570498b7b93caf9f781c , < c9315ce9da3632c591666a29de82d3e92d46bec1 (git)
Affected: b91cd1440870f7a0649e570498b7b93caf9f781c , < 4e476c25bfcab0535ba7c76a903ae77ca8747711 (git)
Affected: b91cd1440870f7a0649e570498b7b93caf9f781c , < bd44ce09b9b569f49ed13e2d87d23d853fc7d6a7 (git)
Affected: b91cd1440870f7a0649e570498b7b93caf9f781c , < 66f7471c4042e4eb300e30b5b9d87d1406862673 (git)
Affected: b91cd1440870f7a0649e570498b7b93caf9f781c , < c088d5dd2fffb4de1fb8e7f57751c8b82942180a (git)
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    Linux Linux Affected: 2.6.32
Unaffected: 0 , < 2.6.32 (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
Unaffected: 7.1-rc1 , ≤ * (original_commit_for_fix)
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}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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