Vulnerability-Lookup

GHSA-76F4-XJP9-XCXC

Vulnerability from github – Published: 2026-04-24 15:32 – Updated: 2026-06-01 18:31

Details

In the Linux kernel, the following vulnerability has been resolved:

net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()

A malicious USB device claiming to be a CDC Phonet modem can overflow the skb_shared_info->frags[] array by sending an unbounded sequence of full-page bulk transfers.

Drop the skb and increment the length error when the frag limit is reached. This matches the same fix that commit f0813bcd2d9d ("net: wwan: t7xx: fix potential skb->frags overflow in RX path") did for the t7xx driver.

Severity

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31623"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-120"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-24T15:16:41Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()\n\nA malicious USB device claiming to be a CDC Phonet modem can overflow\nthe skb_shared_info-\u003efrags[] array by sending an unbounded sequence of\nfull-page bulk transfers.\n\nDrop the skb and increment the length error when the frag limit is\nreached.  This matches the same fix that commit f0813bcd2d9d (\"net:\nwwan: t7xx: fix potential skb-\u003efrags overflow in RX path\") did for the\nt7xx driver.",
  "id": "GHSA-76f4-xjp9-xcxc",
  "modified": "2026-06-01T18:31:27Z",
  "published": "2026-04-24T15:32:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31623"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0c5c65a17db729fc63ab656bdaaf0e675a9dbeac"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/600dc40554dc5ad1e6f3af51f700228033f43ea7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6053620fdbcd89fa7e755644efdaab78e0daaae7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6807ff49bf796b3823b1e29f97b69316a40a9a94"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9989938d13cc5ba8447eeed5a61acfcf61bc6801"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a23b1b1aaf41e174181d5853a70e65d4d01e648c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c183d5775129a0a7495bd61a6e57ec230dcf01e5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d4e1946bea8d6441835eb3fd09b19237ba366a6f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ebf75c6301c4972a87542ebf2d994c6391eb5d46"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-31623 (GCVE-0-2026-31623)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-06-14 17:43

Title

net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()

Summary

In the Linux kernel, the following vulnerability has been resolved: net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete() A malicious USB device claiming to be a CDC Phonet modem can overflow the skb_shared_info->frags[] array by sending an unbounded sequence of full-page bulk transfers. Drop the skb and increment the length error when the frag limit is reached. This matches the same fix that commit f0813bcd2d9d ("net: wwan: t7xx: fix potential skb->frags overflow in RX path") did for the t7xx driver.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

9 references

URL	Tags
https://git.kernel.org/stable/c/6807ff49bf796b382…
https://git.kernel.org/stable/c/0c5c65a17db729fc6…
https://git.kernel.org/stable/c/6053620fdbcd89fa7…
https://git.kernel.org/stable/c/d4e1946bea8d64418…
https://git.kernel.org/stable/c/a23b1b1aaf41e1741…
https://git.kernel.org/stable/c/c183d5775129a0a74…
https://git.kernel.org/stable/c/ebf75c6301c4972a8…
https://git.kernel.org/stable/c/9989938d13cc5ba84…
https://git.kernel.org/stable/c/600dc40554dc5ad1e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 , < 6807ff49bf796b3823b1e29f97b69316a40a9a94 (git) Affected: 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 , < 0c5c65a17db729fc63ab656bdaaf0e675a9dbeac (git) Affected: 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 , < 6053620fdbcd89fa7e755644efdaab78e0daaae7 (git) Affected: 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 , < d4e1946bea8d6441835eb3fd09b19237ba366a6f (git) Affected: 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 , < a23b1b1aaf41e174181d5853a70e65d4d01e648c (git) Affected: 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 , < c183d5775129a0a7495bd61a6e57ec230dcf01e5 (git) Affected: 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 , < ebf75c6301c4972a87542ebf2d994c6391eb5d46 (git) Affected: 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 , < 9989938d13cc5ba8447eeed5a61acfcf61bc6801 (git) Affected: 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 , < 600dc40554dc5ad1e6f3af51f700228033f43ea7 (git)
Linux	Linux	Affected: 2.6.31 Unaffected: 0 , < 2.6.31 (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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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/usb/cdc-phonet.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6807ff49bf796b3823b1e29f97b69316a40a9a94",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "0c5c65a17db729fc63ab656bdaaf0e675a9dbeac",
              "status": "affected",
              "version": "87cf65601e1709e57f7e28f0f7b3eb0a992c1782",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "versionType": "git"
            },
            {
              "lessThan": "a23b1b1aaf41e174181d5853a70e65d4d01e648c",
              "status": "affected",
              "version": "87cf65601e1709e57f7e28f0f7b3eb0a992c1782",
              "versionType": "git"
            },
            {
              "lessThan": "c183d5775129a0a7495bd61a6e57ec230dcf01e5",
              "status": "affected",
              "version": "87cf65601e1709e57f7e28f0f7b3eb0a992c1782",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
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              "status": "affected",
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              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
        {
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          "product": "Linux",
          "programFiles": [
            "drivers/net/usb/cdc-phonet.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.31"
            },
            {
              "lessThan": "2.6.31",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.136",
              "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"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()\n\nA malicious USB device claiming to be a CDC Phonet modem can overflow\nthe skb_shared_info-\u003efrags[] array by sending an unbounded sequence of\nfull-page bulk transfers.\n\nDrop the skb and increment the length error when the frag limit is\nreached.  This matches the same fix that commit f0813bcd2d9d (\"net:\nwwan: t7xx: fix potential skb-\u003efrags overflow in RX path\") did for the\nt7xx driver."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:43:10.837Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/d4e1946bea8d6441835eb3fd09b19237ba366a6f"
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          "url": "https://git.kernel.org/stable/c/a23b1b1aaf41e174181d5853a70e65d4d01e648c"
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          "url": "https://git.kernel.org/stable/c/600dc40554dc5ad1e6f3af51f700228033f43ea7"
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      ],
      "title": "net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31623",
    "datePublished": "2026-04-24T14:42:40.566Z",
    "dateReserved": "2026-03-09T15:48:24.124Z",
    "dateUpdated": "2026-06-14T17:43:10.837Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-76F4-XJP9-XCXC

CVE-2026-31623 (GCVE-0-2026-31623)

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