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GHSA-H96R-XQWG-W67W

Vulnerability from github – Published: 2026-04-24 15:32 – Updated: 2026-04-24 15:32

Details

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").

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31616"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-24T15:16:40Z",
    "severity": null
  },
  "details": "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\").",
  "id": "GHSA-h96r-xqwg-w67w",
  "modified": "2026-04-24T15:32:35Z",
  "published": "2026-04-24T15:32:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31616"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e476c25bfcab0535ba7c76a903ae77ca8747711"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/66f7471c4042e4eb300e30b5b9d87d1406862673"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bd44ce09b9b569f49ed13e2d87d23d853fc7d6a7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c9315ce9da3632c591666a29de82d3e92d46bec1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-04-25 05:48

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

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/c9315ce9da3632c59…
	https://git.kernel.org/stable/c/4e476c25bfcab0535…
	https://git.kernel.org/stable/c/bd44ce09b9b569f49…
	https://git.kernel.org/stable/c/66f7471c4042e4eb3…

Impacted products

Vendor

Product

Version

Linux

Affected: b91cd1440870f7a0649e570498b7b93caf9f781c , < c9315ce9da3632c591666a29de82d3e92d46bec1 (git)
Affected: b91cd1440870f7a0649e570498b7b93caf9f781c , < 4e476c25bfcab0535ba7c76a903ae77ca8747711 (git)
Affected: b91cd1440870f7a0649e570498b7b93caf9f781c , < bd44ce09b9b569f49ed13e2d87d23d853fc7d6a7 (git)
Affected: b91cd1440870f7a0649e570498b7b93caf9f781c , < 66f7471c4042e4eb300e30b5b9d87d1406862673 (git)

Linux

Affected: 2.6.32
Unaffected: 0 , < 2.6.32 (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)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_phonet.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c9315ce9da3632c591666a29de82d3e92d46bec1",
              "status": "affected",
              "version": "b91cd1440870f7a0649e570498b7b93caf9f781c",
              "versionType": "git"
            },
            {
              "lessThan": "4e476c25bfcab0535ba7c76a903ae77ca8747711",
              "status": "affected",
              "version": "b91cd1440870f7a0649e570498b7b93caf9f781c",
              "versionType": "git"
            },
            {
              "lessThan": "bd44ce09b9b569f49ed13e2d87d23d853fc7d6a7",
              "status": "affected",
              "version": "b91cd1440870f7a0649e570498b7b93caf9f781c",
              "versionType": "git"
            },
            {
              "lessThan": "66f7471c4042e4eb300e30b5b9d87d1406862673",
              "status": "affected",
              "version": "b91cd1440870f7a0649e570498b7b93caf9f781c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_phonet.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.32"
            },
            {
              "lessThan": "2.6.32",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.83",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.24",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.83",
                  "versionStartIncluding": "2.6.32",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.24",
                  "versionStartIncluding": "2.6.32",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.14",
                  "versionStartIncluding": "2.6.32",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.1",
                  "versionStartIncluding": "2.6.32",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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\")."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-25T05:48:23.018Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c9315ce9da3632c591666a29de82d3e92d46bec1"
        },
        {
          "url": "https://git.kernel.org/stable/c/4e476c25bfcab0535ba7c76a903ae77ca8747711"
        },
        {
          "url": "https://git.kernel.org/stable/c/bd44ce09b9b569f49ed13e2d87d23d853fc7d6a7"
        },
        {
          "url": "https://git.kernel.org/stable/c/66f7471c4042e4eb300e30b5b9d87d1406862673"
        }
      ],
      "title": "usb: gadget: f_phonet: fix skb frags[] overflow in pn_rx_complete()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31616",
    "datePublished": "2026-04-24T14:42:35.480Z",
    "dateReserved": "2026-03-09T15:48:24.123Z",
    "dateUpdated": "2026-04-25T05:48:23.018Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-H96R-XQWG-W67W

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

Tags

Sightings

Nomenclature