CVE-2026-63870

Summary

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().

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/af07fffbd53ddc3ec3c2a4ca914f27899fa89bca
• https://git.kernel.org/stable/c/3150e6d3223dfc356308125cabf9c34169842d2a
• https://git.kernel.org/stable/c/8da95cb6ad7d656c871e776a9c7b77e894d6d89c
• https://git.kernel.org/stable/c/1a827b95e62b4cbe851ae7cc9c961cdfa769cca4
• https://git.kernel.org/stable/c/c1819c8defa235c7beda859bc185b1c429a55ecd
• https://git.kernel.org/stable/c/285b0842f2e01c3edf805f1fd64da11d9b7f6b4c
• https://git.kernel.org/stable/c/87172cc8dc49aaf54407a31edffb0232f8cb93ab
• https://git.kernel.org/stable/c/3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3

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