{"cve":"CVE-2026-63991","nvd":{"published":"2026-07-19T16:17:37.783","modified":"2026-10-07T20:30:42.207","status":"Analyzed","description":"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->data.\nAdd a NULL check after skb_clone() and skip the peer if the clone fails.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/2061d080a013c0ec0a56162cd501fb36d2befc26","https://git.kernel.org/stable/c/3c40d381ce04f9575a5d8b542898183c3b4b38dc","https://git.kernel.org/stable/c/3d5d81d294ba09487c86bc4ba33dc4a4bec5d215","https://git.kernel.org/stable/c/9903a04becf059e44cccf625e23689b7d4378384","https://git.kernel.org/stable/c/9afcb5ea080af13aab37930da627db43bd277665"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:45:36.895656543+00:00"},"epss":{"cve":"CVE-2026-63991","score":0.00123,"percentile":0.02018,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}