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

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-15 · updated 2026-10-16

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.

Affected products

Linux kernel: from 5.4.24 before 5.5; from 5.5.8 before 5.6; 5.6 — fixed in 5.5, 5.6, 7.2

How to fix

Upgrade to a fixed version: Linux kernel 5.5, 5.6, 7.2. Check the vendor advisory for mitigations.

References

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

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