by Kastro
Paper/Archive/CVE-2026-72436

CVE-2026-72436

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

EPSS 0.7%CVSS 9.8
critical.is priorityof 100
40
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 53.5.535 × 2010.7No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

Affected

ProductAffectedFixed inSource
Linux18f84d41d34fa35d0d64bbaea01fe664553ecc06 – < c107233d2ff4fd7cef5d02f9124b99194957a710c107233d2ff4fd7cef5d02f9124b99194957a710CNA
Linux18f84d41d34fa35d0d64bbaea01fe664553ecc06 – < 6329d3a9afe715fddda0460cfa46b496d61c2fe06329d3a9afe715fddda0460cfa46b496d61c2fe0CNA
Linux18f84d41d34fa35d0d64bbaea01fe664553ecc06 – < 7445fe965b7d8756070a40e80f8b73348ccda1d77445fe965b7d8756070a40e80f8b73348ccda1d7CNA
Linux18f84d41d34fa35d0d64bbaea01fe664553ecc06 – < c4d257734e91bfcdc71d41843392dd6400b5bb1bc4d257734e91bfcdc71d41843392dd6400b5bb1bCNA
Linux18f84d41d34fa35d0d64bbaea01fe664553ecc06 – < 3219d74e4536658c937fd878a327257b86ce80dd3219d74e4536658c937fd878a327257b86ce80ddCNA
Linux18f84d41d34fa35d0d64bbaea01fe664553ecc06 – < e4b4984e28c16406ecb318444dea4a8bf47def3ee4b4984e28c16406ecb318444dea4a8bf47def3eCNA
Linux4.2–CNA

Scores by source

Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refgit.kernel.org/stable/c/c107233d2ff4fd7cef5d02f9124b99194957a710refgit.kernel.org/stable/c/6329d3a9afe715fddda0460cfa46b496d61c2fe0refgit.kernel.org/stable/c/7445fe965b7d8756070a40e80f8b73348ccda1d7refgit.kernel.org/stable/c/c4d257734e91bfcdc71d41843392dd6400b5bb1brefgit.kernel.org/stable/c/3219d74e4536658c937fd878a327257b86ce80ddrefgit.kernel.org/stable/c/e4b4984e28c16406ecb318444dea4a8bf47def3e