{"id":"CVE-2026-63991","summary":"Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt()","details":"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.","modified":"2026-07-21T03:47:42.875265695Z","published":"2026-07-19T14:56:11.824Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63991.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2061d080a013c0ec0a56162cd501fb36d2befc26"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3c40d381ce04f9575a5d8b542898183c3b4b38dc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3d5d81d294ba09487c86bc4ba33dc4a4bec5d215"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9903a04becf059e44cccf625e23689b7d4378384"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9afcb5ea080af13aab37930da627db43bd277665"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b06203ac5f12929d79146bb9f063c2af1d679e63"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d630c4b25f36e0e68461561e4c70957ec37fdedd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e673889a35a5e4c586d0fae67d8755ca4367d3e2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63991.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63991"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"18722c247023035b9e2e2a08a887adec2a9a6e49"},{"fixed":"9afcb5ea080af13aab37930da627db43bd277665"},{"fixed":"9903a04becf059e44cccf625e23689b7d4378384"},{"fixed":"d630c4b25f36e0e68461561e4c70957ec37fdedd"},{"fixed":"b06203ac5f12929d79146bb9f063c2af1d679e63"},{"fixed":"3d5d81d294ba09487c86bc4ba33dc4a4bec5d215"},{"fixed":"e673889a35a5e4c586d0fae67d8755ca4367d3e2"},{"fixed":"2061d080a013c0ec0a56162cd501fb36d2befc26"},{"fixed":"3c40d381ce04f9575a5d8b542898183c3b4b38dc"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-63991.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.14.0"},{"fixed":"5.10.259"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.210"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.176"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.143"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.93"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.35"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.12"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-63991.json"}}],"schema_version":"1.7.5"}