{"id":"CVE-2026-63991","state":"PUBLISHED","title":"Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt()","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.","publishedAt":"2026-07-19T14:56:11.824Z","updatedAt":"2026-07-19T14:56:11.824Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"18722c247023035b9e2e2a08a887adec2a9a6e49","status":"affected","lessThan":"9afcb5ea080af13aab37930da627db43bd277665","versionType":"git"},{"version":"18722c247023035b9e2e2a08a887adec2a9a6e49","status":"affected","lessThan":"9903a04becf059e44cccf625e23689b7d4378384","versionType":"git"},{"version":"18722c247023035b9e2e2a08a887adec2a9a6e49","status":"affected","lessThan":"d630c4b25f36e0e68461561e4c70957ec37fdedd","versionType":"git"},{"version":"18722c247023035b9e2e2a08a887adec2a9a6e49","status":"affected","lessThan":"b06203ac5f12929d79146bb9f063c2af1d679e63","versionType":"git"},{"version":"18722c247023035b9e2e2a08a887adec2a9a6e49","status":"affected","lessThan":"3d5d81d294ba09487c86bc4ba33dc4a4bec5d215","versionType":"git"},{"version":"18722c247023035b9e2e2a08a887adec2a9a6e49","status":"affected","lessThan":"e673889a35a5e4c586d0fae67d8755ca4367d3e2","versionType":"git"},{"version":"18722c247023035b9e2e2a08a887adec2a9a6e49","status":"affected","lessThan":"2061d080a013c0ec0a56162cd501fb36d2befc26","versionType":"git"},{"version":"18722c247023035b9e2e2a08a887adec2a9a6e49","status":"affected","lessThan":"3c40d381ce04f9575a5d8b542898183c3b4b38dc","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/6lowpan.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.14","versionType":"semver"},{"version":"5.10.259","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.210","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.35","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.12","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/6lowpan.c"]}],"references":["https://git.kernel.org/stable/c/9afcb5ea080af13aab37930da627db43bd277665","https://git.kernel.org/stable/c/9903a04becf059e44cccf625e23689b7d4378384","https://git.kernel.org/stable/c/d630c4b25f36e0e68461561e4c70957ec37fdedd","https://git.kernel.org/stable/c/b06203ac5f12929d79146bb9f063c2af1d679e63","https://git.kernel.org/stable/c/3d5d81d294ba09487c86bc4ba33dc4a4bec5d215","https://git.kernel.org/stable/c/e673889a35a5e4c586d0fae67d8755ca4367d3e2","https://git.kernel.org/stable/c/2061d080a013c0ec0a56162cd501fb36d2befc26","https://git.kernel.org/stable/c/3c40d381ce04f9575a5d8b542898183c3b4b38dc"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/63xxx/CVE-2026-63991.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63991","state":"PUBLISHED","datePublished":"2026-07-19T14:56:11.824Z","dateUpdated":"2026-07-19T14:56:11.824Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.025Z"},"containers":{"cna":{"title":"Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt()","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->data.\nAdd a NULL check after skb_clone() and skip the peer if the clone fails."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"18722c247023035b9e2e2a08a887adec2a9a6e49","status":"affected","lessThan":"9afcb5ea080af13aab37930da627db43bd277665","versionType":"git"},{"version":"18722c247023035b9e2e2a08a887adec2a9a6e49","status":"affected","lessThan":"9903a04becf059e44cccf625e23689b7d4378384","versionType":"git"},{"version":"18722c247023035b9e2e2a08a887adec2a9a6e49","status":"affected","lessThan":"d630c4b25f36e0e68461561e4c70957ec37fdedd","versionType":"git"},{"version":"18722c247023035b9e2e2a08a887adec2a9a6e49","status":"affected","lessThan":"b06203ac5f12929d79146bb9f063c2af1d679e63","versionType":"git"},{"version":"18722c247023035b9e2e2a08a887adec2a9a6e49","status":"affected","lessThan":"3d5d81d294ba09487c86bc4ba33dc4a4bec5d215","versionType":"git"},{"version":"18722c247023035b9e2e2a08a887adec2a9a6e49","status":"affected","lessThan":"e673889a35a5e4c586d0fae67d8755ca4367d3e2","versionType":"git"},{"version":"18722c247023035b9e2e2a08a887adec2a9a6e49","status":"affected","lessThan":"2061d080a013c0ec0a56162cd501fb36d2befc26","versionType":"git"},{"version":"18722c247023035b9e2e2a08a887adec2a9a6e49","status":"affected","lessThan":"3c40d381ce04f9575a5d8b542898183c3b4b38dc","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/6lowpan.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.14","versionType":"semver"},{"version":"5.10.259","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.210","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.35","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.12","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/6lowpan.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-07-19T14:56:11.824Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"5.10.259"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"5.15.210"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.1.176"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.6.143"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.12.93"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.18.35"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"7.0.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}