{"api_version":"1","generated_at":"2026-07-24T00:13:34+00:00","cve":"CVE-2026-63991","urls":{"html":"https://cve.report/CVE-2026-63991","api":"https://cve.report/api/cve/CVE-2026-63991.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63991","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63991"},"summary":{"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:37","updated_at":"2026-07-19 16:17:37"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/3c40d381ce04f9575a5d8b542898183c3b4b38dc","name":"https://git.kernel.org/stable/c/3c40d381ce04f9575a5d8b542898183c3b4b38dc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b06203ac5f12929d79146bb9f063c2af1d679e63","name":"https://git.kernel.org/stable/c/b06203ac5f12929d79146bb9f063c2af1d679e63","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e673889a35a5e4c586d0fae67d8755ca4367d3e2","name":"https://git.kernel.org/stable/c/e673889a35a5e4c586d0fae67d8755ca4367d3e2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3d5d81d294ba09487c86bc4ba33dc4a4bec5d215","name":"https://git.kernel.org/stable/c/3d5d81d294ba09487c86bc4ba33dc4a4bec5d215","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9903a04becf059e44cccf625e23689b7d4378384","name":"https://git.kernel.org/stable/c/9903a04becf059e44cccf625e23689b7d4378384","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9afcb5ea080af13aab37930da627db43bd277665","name":"https://git.kernel.org/stable/c/9afcb5ea080af13aab37930da627db43bd277665","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d630c4b25f36e0e68461561e4c70957ec37fdedd","name":"https://git.kernel.org/stable/c/d630c4b25f36e0e68461561e4c70957ec37fdedd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2061d080a013c0ec0a56162cd501fb36d2befc26","name":"https://git.kernel.org/stable/c/2061d080a013c0ec0a56162cd501fb36d2befc26","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63991","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63991","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 18722c247023035b9e2e2a08a887adec2a9a6e49 9afcb5ea080af13aab37930da627db43bd277665 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 18722c247023035b9e2e2a08a887adec2a9a6e49 9903a04becf059e44cccf625e23689b7d4378384 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 18722c247023035b9e2e2a08a887adec2a9a6e49 d630c4b25f36e0e68461561e4c70957ec37fdedd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 18722c247023035b9e2e2a08a887adec2a9a6e49 b06203ac5f12929d79146bb9f063c2af1d679e63 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 18722c247023035b9e2e2a08a887adec2a9a6e49 3d5d81d294ba09487c86bc4ba33dc4a4bec5d215 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 18722c247023035b9e2e2a08a887adec2a9a6e49 e673889a35a5e4c586d0fae67d8755ca4367d3e2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 18722c247023035b9e2e2a08a887adec2a9a6e49 2061d080a013c0ec0a56162cd501fb36d2befc26 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 18722c247023035b9e2e2a08a887adec2a9a6e49 3c40d381ce04f9575a5d8b542898183c3b4b38dc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.14","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.14 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.259 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.93 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.35 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.12 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"63991","cve":"CVE-2026-63991","epss":"0.001760000","percentile":"0.073920000","score_date":"2026-07-20","updated_at":"2026-07-21 00:13:14"},"legacy_qids":[]},"source_records":{"cve_program":{"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->data.\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"},"nvd":{"publishedDate":"2026-07-19 16:17:37","lastModifiedDate":"2026-07-19 16:17:37","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63991","Ordinal":"1","Title":"Bluetooth: 6lowpan: check skb_clone() return value in send_mcast","CVE":"CVE-2026-63991","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63991","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Bluetooth: 6lowpan: check skb_clone() return value in send_mcast"}]}}}