CVE-2026-63991 (GCVE-0-2026-63991)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:56 – Updated: 2026-07-19 14:56
VLAI
Title
Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt()
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt() The skb_clone() function can return NULL if memory allocation fails. send_mcast_pkt() calls skb_clone() without checking the return value, which can lead to a NULL pointer dereference in send_pkt() when it dereferences skb->data. Add a NULL check after skb_clone() and skip the peer if the clone fails.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 18722c247023035b9e2e2a08a887adec2a9a6e49 , < 9afcb5ea080af13aab37930da627db43bd277665 (git)
Affected: 18722c247023035b9e2e2a08a887adec2a9a6e49 , < 9903a04becf059e44cccf625e23689b7d4378384 (git)
Affected: 18722c247023035b9e2e2a08a887adec2a9a6e49 , < d630c4b25f36e0e68461561e4c70957ec37fdedd (git)
Affected: 18722c247023035b9e2e2a08a887adec2a9a6e49 , < b06203ac5f12929d79146bb9f063c2af1d679e63 (git)
Affected: 18722c247023035b9e2e2a08a887adec2a9a6e49 , < 3d5d81d294ba09487c86bc4ba33dc4a4bec5d215 (git)
Affected: 18722c247023035b9e2e2a08a887adec2a9a6e49 , < e673889a35a5e4c586d0fae67d8755ca4367d3e2 (git)
Affected: 18722c247023035b9e2e2a08a887adec2a9a6e49 , < 2061d080a013c0ec0a56162cd501fb36d2befc26 (git)
Affected: 18722c247023035b9e2e2a08a887adec2a9a6e49 , < 3c40d381ce04f9575a5d8b542898183c3b4b38dc (git)
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Linux Linux Affected: 3.14
Unaffected: 0 , < 3.14 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "net/bluetooth/6lowpan.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "3.14"
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.15.210",
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt()\n\nThe skb_clone() function can return NULL if memory allocation fails.\nsend_mcast_pkt() calls skb_clone() without checking the return value, which\ncan lead to a NULL pointer dereference in send_pkt() when it dereferences\nskb-\u003edata.\nAdd a NULL check after skb_clone() and skip the peer if the clone fails."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T14:56:11.824Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/9afcb5ea080af13aab37930da627db43bd277665"
        },
        {
          "url": "https://git.kernel.org/stable/c/9903a04becf059e44cccf625e23689b7d4378384"
        },
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          "url": "https://git.kernel.org/stable/c/d630c4b25f36e0e68461561e4c70957ec37fdedd"
        },
        {
          "url": "https://git.kernel.org/stable/c/b06203ac5f12929d79146bb9f063c2af1d679e63"
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        {
          "url": "https://git.kernel.org/stable/c/3c40d381ce04f9575a5d8b542898183c3b4b38dc"
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      "title": "Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63991",
    "datePublished": "2026-07-19T14:56:11.824Z",
    "dateReserved": "2026-07-19T07:54:57.025Z",
    "dateUpdated": "2026-07-19T14:56:11.824Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63991",
      "date": "2026-07-21",
      "epss": "0.00176",
      "percentile": "0.07393"
    },
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  }
}



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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.

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.