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CVE-2026-63870

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit() The aoe driver (or similar) generates a non-IPv6 packet (e.g., E…

Published Jul 19, 2026EPSS 0.13%

Overview

CVE-2026-63870 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()

The aoe driver (or similar) generates a non-IPv6 packet

(e.g., ETH_P_AOE) and queues it for transmission via dev_queue_xmit()

on a 6LoWPAN interface (configured by the user or test case).

Since the packet is not IPv6, the 6LoWPAN header_ops->create function

(lowpan_header_create or header_create) returns early without initializing

the lowpan_addr_info structure in the skb headroom.

In the transmit function (lowpan_xmit), the driver calls lowpan_header

(or setup_header) which unconditionally copies and uses the lowpan_addr_info

from the headroom, which contains uninitialized data.

Fix this by dropping non IPv6 packets.

A similar fix is needed in net/bluetooth/6lowpan.c bt_xmit().

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/1a827b95e62b4cbe851ae7cc9c961cdfa769cca4Refgit.kernel.org/stable/c/285b0842f2e01c3edf805f1fd64da11d9b7f6b4cRefgit.kernel.org/stable/c/3150e6d3223dfc356308125cabf9c34169842d2aRefgit.kernel.org/stable/c/3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3Refgit.kernel.org/stable/c/87172cc8dc49aaf54407a31edffb0232f8cb93abRefgit.kernel.org/stable/c/8da95cb6ad7d656c871e776a9c7b77e894d6d89cRefgit.kernel.org/stable/c/af07fffbd53ddc3ec3c2a4ca914f27899fa89bcaRefgit.kernel.org/stable/c/c1819c8defa235c7beda859bc185b1c429a55ecd

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63870?

CVE-2026-63870 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-63870?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-63870?

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-2026-63870?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63870 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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