CVE-2025-40282
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-06

Last updated on: 2025-12-08

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: 6lowpan: reset link-local header on ipv6 recv path Bluetooth 6lowpan.c netdev has header_ops, so it must set link-local header for RX skb, otherwise things crash, eg. with AF_PACKET SOCK_RAW Add missing skb_reset_mac_header() for uncompressed ipv6 RX path. For the compressed one, it is done in lowpan_header_decompress(). Log: (BlueZ 6lowpan-tester Client Recv Raw - Success) ------ kernel BUG at net/core/skbuff.c:212! Call Trace: <IRQ> ... packet_rcv (net/packet/af_packet.c:2152) ... <TASK> __local_bh_enable_ip (kernel/softirq.c:407) netif_rx (net/core/dev.c:5648) chan_recv_cb (net/bluetooth/6lowpan.c:294 net/bluetooth/6lowpan.c:359) ------
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Meta Information
Published
2025-12-06
Last Modified
2025-12-08
Generated
2026-06-16
AI Q&A
2025-12-07
EPSS Evaluated
2026-06-15
NVD
CVE-2025-40282
EUVD
EUVD-2025-201573
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability in the Linux kernel's Bluetooth 6lowpan implementation occurs because the link-local header is not properly reset on the IPv6 receive path. Specifically, the missing call to skb_reset_mac_header() for the uncompressed IPv6 RX path can cause kernel crashes when receiving packets, such as with AF_PACKET SOCK_RAW sockets. The issue arises because the netdev has header_ops and requires the link-local header to be set correctly for received skb packets to avoid crashes.

Impact Analysis

This vulnerability can cause the Linux kernel to crash when processing certain Bluetooth 6lowpan IPv6 packets, leading to system instability or denial of service. Applications or systems using Bluetooth 6lowpan with raw socket packet reception could experience unexpected kernel bugs or crashes, potentially disrupting normal operation.

Detection Guidance

This vulnerability can be detected by monitoring kernel logs for specific BUG messages related to Bluetooth 6lowpan, such as 'kernel BUG at net/core/skbuff.c:212!' and call traces involving net/bluetooth/6lowpan.c. You can use commands like 'dmesg | grep -i 6lowpan' or 'journalctl -k | grep -i 6lowpan' to check for these kernel BUG messages indicating the issue.

Mitigation Strategies

Immediate mitigation involves updating the Linux kernel to a version where this vulnerability is fixed, as the issue is resolved by adding missing skb_reset_mac_header() calls in the Bluetooth 6lowpan code. Until an update is applied, you may consider disabling Bluetooth 6lowpan functionality if possible to avoid triggering the bug.

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