# CVE-2025-40282: Bluetooth: 6lowpan: reset link-local header on ipv6 recv path

> A missing header reset in the Linux kernel Bluetooth 6lowpan module causes a kernel crash when receiving raw IPv6 packets.

- **Severity:** High 8.8 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 6 Dec 2025
- **Updated:** 5 Aug 2026
- **Also known as:** BELL-CVE-2025-40282, DEBIAN-CVE-2025-40282, GHSA-5r7j-r8w6-f8xc, ROOT-OS-DEBIAN-12-CVE-2025-40282, ROOT-OS-DEBIAN-13-CVE-2025-40282, ROOT-OS-UBUNTU-2204-CVE-2025-40282, ROOT-OS-UBUNTU-2404-CVE-2025-40282, UBUNTU-CVE-2025-40282

## What is CVE-2025-40282?

CVE-2025-40282 is a high-severity vulnerability in Linux, published on 6 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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)
------

## Which versions are affected by CVE-2025-40282?


## How do I fix CVE-2025-40282?

Apply the vendor's patch.

## Is CVE-2025-40282 being exploited?

There is no known exploitation of CVE-2025-40282 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-40282 and fix it if it is affected.

What it is: CVE-2025-40282 is a high-severity vulnerability in Linux, published on 6 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-40282 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-40282/ (Markdown: https://insights.sbomify.com/CVE-2025-40282/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-40282
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-40282
- OSV: https://osv.dev/vulnerability/CVE-2025-40282

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-40282/
Summaries are generated and may contain mistakes; the official description above is the record.