CVE-2026-72436netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
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
- 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.