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GHSA-H5XW-XH97-3J7M

Vulnerability from github – Published: 2026-02-04 18:30 – Updated: 2026-02-04 18:30

Details

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

udp: call skb_orphan() before skb_attempt_defer_free()

Standard UDP receive path does not use skb->destructor.

But skmsg layer does use it, since it calls skb_set_owner_sk_safe() from udp_read_skb().

This then triggers this warning in skb_attempt_defer_free():

DEBUG_NET_WARN_ON_ONCE(skb->destructor);

We must call skb_orphan() to fix this issue.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-23048"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-02-04T16:16:20Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp: call skb_orphan() before skb_attempt_defer_free()\n\nStandard UDP receive path does not use skb-\u003edestructor.\n\nBut skmsg layer does use it, since it calls skb_set_owner_sk_safe()\nfrom udp_read_skb().\n\nThis then triggers this warning in skb_attempt_defer_free():\n\n    DEBUG_NET_WARN_ON_ONCE(skb-\u003edestructor);\n\nWe must call skb_orphan() to fix this issue.",
  "id": "GHSA-h5xw-xh97-3j7m",
  "modified": "2026-02-04T18:30:41Z",
  "published": "2026-02-04T18:30:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23048"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0c63d5683eae6a7b4d81382bcbecb2a19feff90d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e5c8eda39a9fc1547d1398d707aa06c1d080abdd"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-23048 (GCVE-0-2026-23048)

Vulnerability from cvelistv5 – Published: 2026-02-04 16:00 – Updated: 2026-05-11 21:58

Title

udp: call skb_orphan() before skb_attempt_defer_free()

Summary

In the Linux kernel, the following vulnerability has been resolved: udp: call skb_orphan() before skb_attempt_defer_free() Standard UDP receive path does not use skb->destructor. But skmsg layer does use it, since it calls skb_set_owner_sk_safe() from udp_read_skb(). This then triggers this warning in skb_attempt_defer_free(): DEBUG_NET_WARN_ON_ONCE(skb->destructor); We must call skb_orphan() to fix this issue.

Severity

No CVSS data available.

Assigner

Linux mitre root Scorecard

References

2 references

URL	Tags
https://git.kernel.org/stable/c/0c63d5683eae6a7b4…
https://git.kernel.org/stable/c/e5c8eda39a9fc1547…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 6471658dc66c670580a7616e75f51b52917e7883 , < 0c63d5683eae6a7b4d81382bcbecb2a19feff90d (git) Affected: 6471658dc66c670580a7616e75f51b52917e7883 , < e5c8eda39a9fc1547d1398d707aa06c1d080abdd (git)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.18.6 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/udp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0c63d5683eae6a7b4d81382bcbecb2a19feff90d",
              "status": "affected",
              "version": "6471658dc66c670580a7616e75f51b52917e7883",
              "versionType": "git"
            },
            {
              "lessThan": "e5c8eda39a9fc1547d1398d707aa06c1d080abdd",
              "status": "affected",
              "version": "6471658dc66c670580a7616e75f51b52917e7883",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/udp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "lessThan": "6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.6",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp: call skb_orphan() before skb_attempt_defer_free()\n\nStandard UDP receive path does not use skb-\u003edestructor.\n\nBut skmsg layer does use it, since it calls skb_set_owner_sk_safe()\nfrom udp_read_skb().\n\nThis then triggers this warning in skb_attempt_defer_free():\n\n    DEBUG_NET_WARN_ON_ONCE(skb-\u003edestructor);\n\nWe must call skb_orphan() to fix this issue."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:58:59.709Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0c63d5683eae6a7b4d81382bcbecb2a19feff90d"
        },
        {
          "url": "https://git.kernel.org/stable/c/e5c8eda39a9fc1547d1398d707aa06c1d080abdd"
        }
      ],
      "title": "udp: call skb_orphan() before skb_attempt_defer_free()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23048",
    "datePublished": "2026-02-04T16:00:30.232Z",
    "dateReserved": "2026-01-13T15:37:45.949Z",
    "dateUpdated": "2026-05-11T21:58:59.709Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

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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-H5XW-XH97-3J7M

CVE-2026-23048 (GCVE-0-2026-23048)

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