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

Vulnerability from cvelistv5 – Published: 2026-02-04 16:00 – Updated: 2026-05-11 21:58
VLAI
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
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6471658dc66c670580a7616e75f51b52917e7883 , < 0c63d5683eae6a7b4d81382bcbecb2a19feff90d (git)
Affected: 6471658dc66c670580a7616e75f51b52917e7883 , < e5c8eda39a9fc1547d1398d707aa06c1d080abdd (git)
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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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{
  "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",
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              "versionType": "git"
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            "net/ipv4/udp.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "versionType": "semver"
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            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "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"
            }
          ]
        }
      ],
      "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",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-23048",
      "date": "2026-10-01",
      "epss": "0.00154",
      "percentile": "0.03857"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "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"
                  }
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              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "net/ipv4/udp.c"
                ],
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                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "6.18"
                  },
                  {
                    "lessThan": "6.18",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
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                    "status": "unaffected",
                    "version": "6.18.6",
                    "versionType": "semver"
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                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.19",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nudp: llamar a skb_orphan() antes de skb_attempt_defer_free()\n\nLa ruta de recepci\u00f3n UDP est\u00e1ndar no utiliza skb-\u0026gt;destructor.\n\nPero la capa skmsg s\u00ed lo utiliza, ya que llama a skb_set_owner_sk_safe() desde udp_read_skb().\n\nEsto entonces activa esta advertencia en skb_attempt_defer_free():\n\nDEBUG_NET_WARN_ON_ONCE(skb-\u0026gt;destructor);\n\nDebemos llamar a skb_orphan() para solucionar este problema."
          }
        ],
        "id": "CVE-2026-23048",
        "lastModified": "2026-06-17T10:20:46.290",
        "metrics": {},
        "published": "2026-02-04T16:16:20.343",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0c63d5683eae6a7b4d81382bcbecb2a19feff90d"
          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e5c8eda39a9fc1547d1398d707aa06c1d080abdd"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-28T11:14:37+00:00",
      "cve": "CVE-2026-23048",
      "id": "CVE-2026-23048",
      "initial_release_date": "2026-02-04T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "260",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: udp: call skb_orphan() before skb_attempt_defer_free()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23048.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-05-13T03:46:36Z",
      "cve": "CVE-2026-23048",
      "id": "CVE-2026-23048",
      "initial_release_date": "2026-02-05T00:25:48Z",
      "product_status:known_not_affected": "261",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23048",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23048.json",
      "version": "6"
    }
  }
}



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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.

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