CVE-2026-72436

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

State: Published
Severity: 9.8 Critical
Published: Aug 15, 2026
Updated: Oct 16, 2026
Reserved: Aug 9, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	18f84d41d34fa35d0d64bbaea01fe664553ecc06 to before c107233d2ff4fd7cef5d02f9124b99194957a710Affected 18f84d41d34fa35d0d64bbaea01fe664553ecc06 to before 6329d3a9afe715fddda0460cfa46b496d61c2fe0Affected 18f84d41d34fa35d0d64bbaea01fe664553ecc06 to before 7445fe965b7d8756070a40e80f8b73348ccda1d7Affected 18f84d41d34fa35d0d64bbaea01fe664553ecc06 to before c4d257734e91bfcdc71d41843392dd6400b5bb1bAffected 18f84d41d34fa35d0d64bbaea01fe664553ecc06 to before 3219d74e4536658c937fd878a327257b86ce80ddAffected 18f84d41d34fa35d0d64bbaea01fe664553ecc06 to before e4b4984e28c16406ecb318444dea4a8bf47def3eAffected
LinuxLinux	4.2Affected before 4.2Not affected 6.1.178 through 6.1.Not affected 6.6.145 through 6.6.Not affected 6.12.97 through 6.12.Not affected 6.18.40 through 6.18.Not affected 7.1.5 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

18f84d41d34fa35d0d64bbaea01fe664553ecc06 to before c107233d2ff4fd7cef5d02f9124b99194957a710Affected
18f84d41d34fa35d0d64bbaea01fe664553ecc06 to before 6329d3a9afe715fddda0460cfa46b496d61c2fe0Affected
18f84d41d34fa35d0d64bbaea01fe664553ecc06 to before 7445fe965b7d8756070a40e80f8b73348ccda1d7Affected
18f84d41d34fa35d0d64bbaea01fe664553ecc06 to before c4d257734e91bfcdc71d41843392dd6400b5bb1bAffected
18f84d41d34fa35d0d64bbaea01fe664553ecc06 to before 3219d74e4536658c937fd878a327257b86ce80ddAffected
18f84d41d34fa35d0d64bbaea01fe664553ecc06 to before e4b4984e28c16406ecb318444dea4a8bf47def3eAffected

LinuxLinux

4.2Affected
before 4.2Not affected
6.1.178 through 6.1.*Not affected
6.6.145 through 6.6.*Not affected
6.12.97 through 6.12.*Not affected
6.18.40 through 6.18.*Not affected
7.1.5 through 7.1.*Not affected
7.2 and laterNot affected

References

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