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CVE-2026-63991

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 alloc…

Published Jul 19, 2026EPSS 0.12%

Overview

CVE-2026-63991 is a known-severity vulnerability. It was published on July 19, 2026.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/2061d080a013c0ec0a56162cd501fb36d2befc26Refgit.kernel.org/stable/c/3c40d381ce04f9575a5d8b542898183c3b4b38dcRefgit.kernel.org/stable/c/3d5d81d294ba09487c86bc4ba33dc4a4bec5d215Refgit.kernel.org/stable/c/9903a04becf059e44cccf625e23689b7d4378384Refgit.kernel.org/stable/c/9afcb5ea080af13aab37930da627db43bd277665Refgit.kernel.org/stable/c/b06203ac5f12929d79146bb9f063c2af1d679e63Refgit.kernel.org/stable/c/d630c4b25f36e0e68461561e4c70957ec37fdeddRefgit.kernel.org/stable/c/e673889a35a5e4c586d0fae67d8755ca4367d3e2

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63991?

CVE-2026-63991 is a known-severity vulnerability. It was published on July 19, 2026.

How severe is CVE-2026-63991?

CVSS score information is not yet available for this vulnerability. Check back as the CVE record is updated by NVD analysts.

How do I fix or remediate CVE-2026-63991?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-63991?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63991 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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