CVE-2026-63991
Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt()
Description
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.
INFO
Published Date :
July 19, 2026, 4:17 p.m.
Last Modified :
July 30, 2026, 2:51 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Check skb_clone() return value in send_mcast_pkt().
- Skip the peer if the skb clone fails.
- Apply kernel patches for the Bluetooth vulnerability.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-63991.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-63991 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-63991
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-63991 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-63991 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '18722c247023035b9e2e2a08a887adec2a9a6e49', 'lessThan': '9afcb5ea080af13aab37930da627db43bd277665', 'versionType': 'git'}, {'status': 'affected', 'version': '18722c247023035b9e2e2a08a887adec2a9a6e49', 'lessThan': '9903a04becf059e44cccf625e23689b7d4378384', 'versionType': 'git'}, {'status': 'affected', 'version': '18722c247023035b9e2e2a08a887adec2a9a6e49', 'lessThan': 'd630c4b25f36e0e68461561e4c70957ec37fdedd', 'versionType': 'git'}, {'status': 'affected', 'version': '18722c247023035b9e2e2a08a887adec2a9a6e49', 'lessThan': 'b06203ac5f12929d79146bb9f063c2af1d679e63', 'versionType': 'git'}, {'status': 'affected', 'version': '18722c247023035b9e2e2a08a887adec2a9a6e49', 'lessThan': '3d5d81d294ba09487c86bc4ba33dc4a4bec5d215', 'versionType': 'git'}, {'status': 'affected', 'version': '18722c247023035b9e2e2a08a887adec2a9a6e49', 'lessThan': 'e673889a35a5e4c586d0fae67d8755ca4367d3e2', 'versionType': 'git'}, {'status': 'affected', 'version': '18722c247023035b9e2e2a08a887adec2a9a6e49', 'lessThan': '2061d080a013c0ec0a56162cd501fb36d2befc26', 'versionType': 'git'}, {'status': 'affected', 'version': '18722c247023035b9e2e2a08a887adec2a9a6e49', 'lessThan': '3c40d381ce04f9575a5d8b542898183c3b4b38dc', 'versionType': 'git'}], 'programFiles': ['net/bluetooth/6lowpan.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.14'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.14', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.259', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.210', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.93', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.35', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.12', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/bluetooth/6lowpan.c'], 'defaultStatus': 'affected'}] Added Description 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. Added Reference https://git.kernel.org/stable/c/2061d080a013c0ec0a56162cd501fb36d2befc26 Added Reference https://git.kernel.org/stable/c/3c40d381ce04f9575a5d8b542898183c3b4b38dc Added Reference https://git.kernel.org/stable/c/3d5d81d294ba09487c86bc4ba33dc4a4bec5d215 Added Reference https://git.kernel.org/stable/c/9903a04becf059e44cccf625e23689b7d4378384 Added Reference https://git.kernel.org/stable/c/9afcb5ea080af13aab37930da627db43bd277665 Added Reference https://git.kernel.org/stable/c/b06203ac5f12929d79146bb9f063c2af1d679e63 Added Reference https://git.kernel.org/stable/c/d630c4b25f36e0e68461561e4c70957ec37fdedd Added Reference https://git.kernel.org/stable/c/e673889a35a5e4c586d0fae67d8755ca4367d3e2