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CVE-2026-63991

Published Jul 19, 2026 EPSS 0.18% (7th pctl)

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

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

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's AI-powered security agents can automatically detect CVE-2026-63991 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

How CyberStrike Helps

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