UnratedFix available
Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt()
Type: advisorySources: OSV
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt() The skb_clone() function can return NULL if memory allocation fails. send_mcast_pkt() calls skb_clone() without checking the return value, which can lead to a NULL pointer dereference in send_pkt() when it dereferences skb->data. Add a NULL check after skb_clone() and skip the peer if the clone fails.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.259, 5.15.210, 6.1.176, 6.12.93, 6.18.35, 6.6.143, 7.0.12
- CVEs
- CVE-2026-63991
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 20:52 UTC · Revision 1
Source evidence
Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt()
core-osv · Original sourcePublished 19 Jul 2026, 14:56 UTC
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt() The skb_clone() function can return NULL if memory allocation fails. send_mcast_pkt() calls skb_clone() without checking the return value, which can lead to a NULL pointer dereference in send_pkt() when it dereferences skb->data. Add a NULL check after skb_clone() and skip the peer if the clone fails.
osv:CVE-2026-63991
Kernel
Fixed versions: 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12
Complete source record
{
"id": "4ff41468bbd2525b871bc976f455e77a5feed7d20a87bbedbd7b5457342b6949",
"url": "https://osv.dev/vulnerability/CVE-2026-63991",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt()",
"summary": "In the Linux kernel, the following vulnerability has been resolved: Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt() The skb_clone() function can return NULL if memory allocation fails. send_mcast_pkt() calls skb_clone() without checking the return value, which can lead to a NULL pointer dereference in send_pkt() when it dereferences skb->data. Add a NULL check after skb_clone() and skip the peer if the clone fails.",
"evidence": "osv:CVE-2026-63991",
"products": [
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"package": {
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"modified": "2026-10-28T02:30:39.449569899Z",
"provider": "osv",
"references": [
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"https://git.kernel.org/stable/c/e673889a35a5e4c586d0fae67d8755ca4367d3e2",
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"https://nvd.nist.gov/vuln/detail/CVE-2026-63991",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63991.json"
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},
"related_cves": [
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"evidence": "/id"
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"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 506895,
"published_at": "2026-07-19T14:56:11.824+00:00"
}