CVE-2026-63991 (GCVE-0-2026-63991)
Vulnerability from cvelistv5
Published
2026-07-19 14:56
Modified
2026-07-19 14:56
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 18722c247023035b9e2e2a08a887adec2a9a6e49
Version: 18722c247023035b9e2e2a08a887adec2a9a6e49
Version: 18722c247023035b9e2e2a08a887adec2a9a6e49
Version: 18722c247023035b9e2e2a08a887adec2a9a6e49
Version: 18722c247023035b9e2e2a08a887adec2a9a6e49
Version: 18722c247023035b9e2e2a08a887adec2a9a6e49
Version: 18722c247023035b9e2e2a08a887adec2a9a6e49
Version: 18722c247023035b9e2e2a08a887adec2a9a6e49
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/6lowpan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "9afcb5ea080af13aab37930da627db43bd277665",
              "status": "affected",
              "version": "18722c247023035b9e2e2a08a887adec2a9a6e49",
              "versionType": "git"
            },
            {
              "lessThan": "9903a04becf059e44cccf625e23689b7d4378384",
              "status": "affected",
              "version": "18722c247023035b9e2e2a08a887adec2a9a6e49",
              "versionType": "git"
            },
            {
              "lessThan": "d630c4b25f36e0e68461561e4c70957ec37fdedd",
              "status": "affected",
              "version": "18722c247023035b9e2e2a08a887adec2a9a6e49",
              "versionType": "git"
            },
            {
              "lessThan": "b06203ac5f12929d79146bb9f063c2af1d679e63",
              "status": "affected",
              "version": "18722c247023035b9e2e2a08a887adec2a9a6e49",
              "versionType": "git"
            },
            {
              "lessThan": "3d5d81d294ba09487c86bc4ba33dc4a4bec5d215",
              "status": "affected",
              "version": "18722c247023035b9e2e2a08a887adec2a9a6e49",
              "versionType": "git"
            },
            {
              "lessThan": "e673889a35a5e4c586d0fae67d8755ca4367d3e2",
              "status": "affected",
              "version": "18722c247023035b9e2e2a08a887adec2a9a6e49",
              "versionType": "git"
            },
            {
              "lessThan": "2061d080a013c0ec0a56162cd501fb36d2befc26",
              "status": "affected",
              "version": "18722c247023035b9e2e2a08a887adec2a9a6e49",
              "versionType": "git"
            },
            {
              "lessThan": "3c40d381ce04f9575a5d8b542898183c3b4b38dc",
              "status": "affected",
              "version": "18722c247023035b9e2e2a08a887adec2a9a6e49",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/6lowpan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.14"
            },
            {
              "lessThan": "3.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.259",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.210",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.176",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.143",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.93",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.35",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.12",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": [
        {
          "url": "https://git.kernel.org/stable/c/9afcb5ea080af13aab37930da627db43bd277665"
        },
        {
          "url": "https://git.kernel.org/stable/c/9903a04becf059e44cccf625e23689b7d4378384"
        },
        {
          "url": "https://git.kernel.org/stable/c/d630c4b25f36e0e68461561e4c70957ec37fdedd"
        },
        {
          "url": "https://git.kernel.org/stable/c/b06203ac5f12929d79146bb9f063c2af1d679e63"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d5d81d294ba09487c86bc4ba33dc4a4bec5d215"
        },
        {
          "url": "https://git.kernel.org/stable/c/e673889a35a5e4c586d0fae67d8755ca4367d3e2"
        },
        {
          "url": "https://git.kernel.org/stable/c/2061d080a013c0ec0a56162cd501fb36d2befc26"
        },
        {
          "url": "https://git.kernel.org/stable/c/3c40d381ce04f9575a5d8b542898183c3b4b38dc"
        }
      ],
      "title": "Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.