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

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-06-14 17:43
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b91cd1440870f7a0649e570498b7b93caf9f781c , < 3d7f7e0c842242878c24b2facff8d6eda23ee1e9 (git)
Affected: b91cd1440870f7a0649e570498b7b93caf9f781c , < b5ec49fa198bd08967a3102bd41f53ccadce72c9 (git)
Affected: b91cd1440870f7a0649e570498b7b93caf9f781c , < 7424f0287da73d3d8c5fa5e9d25d26fce762708e (git)
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: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (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 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_phonet: fix skb frags[] overflow in pn_rx_complete()\n\nA broken/bored/mean USB host can overflow the skb_shared_info-\u003efrags[]\narray on a Linux gadget exposing a Phonet function by sending an\nunbounded sequence of full-page OUT transfers.\n\npn_rx_complete() finalizes the skb only when req-\u003eactual \u003c req-\u003elength,\nwhere req-\u003elength is set to PAGE_SIZE by the gadget.  If the host always\nsends exactly PAGE_SIZE bytes per transfer, fp-\u003erx.skb will never be\nreset and each completion will add another fragment via\nskb_add_rx_frag().  Once nr_frags exceeds MAX_SKB_FRAGS (default 17),\nsubsequent frag stores overwrite memory adjacent to the shinfo on the\nheap.\n\nDrop the skb and account a length error when the frag limit is reached,\nmatching the fix applied in t7xx by commit f0813bcd2d9d (\"net: wwan:\nt7xx: fix potential skb-\u003efrags overflow in RX path\")."
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        "dateUpdated": "2026-06-14T17:43:01.212Z",
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/3d7f7e0c842242878c24b2facff8d6eda23ee1e9"
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          "url": "https://git.kernel.org/stable/c/b5ec49fa198bd08967a3102bd41f53ccadce72c9"
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          "url": "https://git.kernel.org/stable/c/c088d5dd2fffb4de1fb8e7f57751c8b82942180a"
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      "title": "usb: gadget: f_phonet: fix skb frags[] overflow in pn_rx_complete()",
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    "dateReserved": "2026-03-09T15:48:24.123Z",
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Once nr_frags exceeds MAX_SKB_FRAGS (default 17),\\nsubsequent frag stores overwrite memory adjacent to the shinfo on the\\nheap.\\n\\nDrop the skb and account a length error when the frag limit is reached,\\nmatching the fix applied in t7xx by commit f0813bcd2d9d (\\\"net: wwan:\\nt7xx: fix potential skb-\u003efrags overflow in RX 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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T12:03:47+00:00",
      "cve": "CVE-2026-31616",
      "id": "CVE-2026-31616",
      "initial_release_date": "2026-04-24T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: gadget: f_phonet: fix skb frags[] overflow in pn_rx_complete()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31616.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:30:07Z",
      "cve": "CVE-2026-31616",
      "id": "CVE-2026-31616",
      "initial_release_date": "2026-04-25T01:37:55Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "398",
      "product_status:known_not_affected": "310",
      "product_status:recommended": "254",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31616",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31616.json",
      "version": "13"
    }
  }
}



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Taxonomy of the tags.





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

Author Source Type Date Other

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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.