{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63991", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.025Z", "datePublished": "2026-07-19T14:56:11.824Z", "dateUpdated": "2026-07-19T14:56:11.824Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-19T14:56:11.824Z"}, "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": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/6lowpan.c"], "versions": [{"version": "18722c247023035b9e2e2a08a887adec2a9a6e49", "lessThan": "9afcb5ea080af13aab37930da627db43bd277665", "status": "affected", "versionType": "git"}, {"version": "18722c247023035b9e2e2a08a887adec2a9a6e49", "lessThan": "9903a04becf059e44cccf625e23689b7d4378384", "status": "affected", "versionType": "git"}, {"version": "18722c247023035b9e2e2a08a887adec2a9a6e49", "lessThan": "d630c4b25f36e0e68461561e4c70957ec37fdedd", "status": "affected", "versionType": "git"}, {"version": "18722c247023035b9e2e2a08a887adec2a9a6e49", "lessThan": "b06203ac5f12929d79146bb9f063c2af1d679e63", "status": "affected", "versionType": "git"}, {"version": "18722c247023035b9e2e2a08a887adec2a9a6e49", "lessThan": "3d5d81d294ba09487c86bc4ba33dc4a4bec5d215", "status": "affected", "versionType": "git"}, {"version": "18722c247023035b9e2e2a08a887adec2a9a6e49", "lessThan": "e673889a35a5e4c586d0fae67d8755ca4367d3e2", "status": "affected", "versionType": "git"}, {"version": "18722c247023035b9e2e2a08a887adec2a9a6e49", "lessThan": "2061d080a013c0ec0a56162cd501fb36d2befc26", "status": "affected", "versionType": "git"}, {"version": "18722c247023035b9e2e2a08a887adec2a9a6e49", "lessThan": "3c40d381ce04f9575a5d8b542898183c3b4b38dc", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/6lowpan.c"], "versions": [{"version": "3.14", "status": "affected"}, {"version": "0", "lessThan": "3.14", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.93", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.35", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.12", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "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"}]}]}], "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"}}}}

{}

{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-63991", "lastModified": "2026-07-30T14:51:11.223", "metrics": {}, "published": "2026-07-19T16:17:37.783", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2061d080a013c0ec0a56162cd501fb36d2befc26"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3c40d381ce04f9575a5d8b542898183c3b4b38dc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3d5d81d294ba09487c86bc4ba33dc4a4bec5d215"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9903a04becf059e44cccf625e23689b7d4378384"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9afcb5ea080af13aab37930da627db43bd277665"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b06203ac5f12929d79146bb9f063c2af1d679e63"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d630c4b25f36e0e68461561e4c70957ec37fdedd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e673889a35a5e4c586d0fae67d8755ca4367d3e2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt()", "id": "2502419", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502419"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nBluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt()\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.", "A flaw was found in the Linux kernel's Bluetooth 6lowpan module. This vulnerability occurs because the `send_mcast_pkt()` function does not properly check the return value of `skb_clone()`, which can be null if memory allocation fails. An attacker could exploit this by triggering a scenario where `skb_clone()` returns null, leading to a null pointer dereference. This can result in a system crash, causing a denial of service (DoS)."], "name": "CVE-2026-63991", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63991\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63991\nhttps://lore.kernel.org/linux-cve-announce/2026071904-CVE-2026-63991-8744@gregkh/T"], "threat_severity": "Low"}