Critical 9.8Published Aug 15, 2026

CVE-2026-72436netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types

Updated under an hour ago (Oct 27, 2026, 10:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types Sashiko pointed out that there are a few lockless RCU readers using test_bit() which is a relaxed atomic operation and provides no memory barrier guarantees. Use test_bit_acquire() instead where the operation may run parallel with add/del/gc, i.e. is not one from the next cases - protected by region lock - in a set destroy phase - in a new/temporary set creation phase

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 18f84d41d34fa35d0d64bbaea01fe664553ecc06 before c107233d2ff4fd7cef5d02f9124b99194957a710; from 18f84d41d34fa35d0d64bbaea01fe664553ecc06 before 6329d3a9afe715fddda0460cfa46b496d61c2fe0; from 18f84d41d34fa35d0d64bbaea01fe664553ecc06 before 7445fe965b7d8756070a40e80f8b73348ccda1d7; from 18f84d41d34fa35d0d64bbaea01fe664553ecc06 before c4d257734e91bfcdc71d41843392dd6400b5bb1b; from 18f84d41d34fa35d0d64bbaea01fe664553ecc06 before 3219d74e4536658c937fd878a327257b86ce80dd; from 18f84d41d34fa35d0d64bbaea01fe664553ecc06 before e4b4984e28c16406ecb318444dea4a8bf47def3e	CNA record

References

References

https://git.kernel.org/stable/c/c107233d2ff4fd7cef5d02f9124b99194957a710
https://git.kernel.org/stable/c/6329d3a9afe715fddda0460cfa46b496d61c2fe0
https://git.kernel.org/stable/c/7445fe965b7d8756070a40e80f8b73348ccda1d7
https://git.kernel.org/stable/c/c4d257734e91bfcdc71d41843392dd6400b5bb1b
https://git.kernel.org/stable/c/3219d74e4536658c937fd878a327257b86ce80dd
https://git.kernel.org/stable/c/e4b4984e28c16406ecb318444dea4a8bf47def3e

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.