Medium 5.5Published Jul 19, 2026

CVE-2026-63991Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt()

Updated under an hour ago (Oct 27, 2026, 3:30 PM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Jul 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	18722c247023035b9e2e2a08a887adec2a9a6e49 builds before 9afcb5ea080af13aab37930da627db43bd277665; 18722c247023035b9e2e2a08a887adec2a9a6e49 builds before 9903a04becf059e44cccf625e23689b7d4378384; from 18722c247023035b9e2e2a08a887adec2a9a6e49 before d630c4b25f36e0e68461561e4c70957ec37fdedd; from 18722c247023035b9e2e2a08a887adec2a9a6e49 before b06203ac5f12929d79146bb9f063c2af1d679e63; 18722c247023035b9e2e2a08a887adec2a9a6e49 builds before 3d5d81d294ba09487c86bc4ba33dc4a4bec5d215; from 18722c247023035b9e2e2a08a887adec2a9a6e49 before e673889a35a5e4c586d0fae67d8755ca4367d3e2; 18722c247023035b9e2e2a08a887adec2a9a6e49 builds before 2061d080a013c0ec0a56162cd501fb36d2befc26; 18722c247023035b9e2e2a08a887adec2a9a6e49 builds before 3c40d381ce04f9575a5d8b542898183c3b4b38dc	CNA record
linux linux_kernel linux:linux_kernel	from 3.14 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.93; from 6.13 before 6.18.35; from 6.19 before 7.0.12; 7.1; and 4 more ranges	NVD

References

References

https://git.kernel.org/stable/c/9afcb5ea080af13aab37930da627db43bd277665	patch
https://git.kernel.org/stable/c/9903a04becf059e44cccf625e23689b7d4378384	patch
https://git.kernel.org/stable/c/d630c4b25f36e0e68461561e4c70957ec37fdedd	patch
https://git.kernel.org/stable/c/b06203ac5f12929d79146bb9f063c2af1d679e63	patch
https://git.kernel.org/stable/c/3d5d81d294ba09487c86bc4ba33dc4a4bec5d215	patch
https://git.kernel.org/stable/c/e673889a35a5e4c586d0fae67d8755ca4367d3e2	patch
https://git.kernel.org/stable/c/2061d080a013c0ec0a56162cd501fb36d2befc26	patch
https://git.kernel.org/stable/c/3c40d381ce04f9575a5d8b542898183c3b4b38dc	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.