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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72436
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:17 UTC
Updated2026-08-17 06:19:10 UTC
DescriptionIn 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

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.007120000 probability, percentile 0.505610000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 18f84d41d34fa35d0d64bbaea01fe664553ecc06 c107233d2ff4fd7cef5d02f9124b99194957a710 git Not specified
CNA Linux Linux affected 18f84d41d34fa35d0d64bbaea01fe664553ecc06 6329d3a9afe715fddda0460cfa46b496d61c2fe0 git Not specified
CNA Linux Linux affected 18f84d41d34fa35d0d64bbaea01fe664553ecc06 7445fe965b7d8756070a40e80f8b73348ccda1d7 git Not specified
CNA Linux Linux affected 18f84d41d34fa35d0d64bbaea01fe664553ecc06 c4d257734e91bfcdc71d41843392dd6400b5bb1b git Not specified
CNA Linux Linux affected 18f84d41d34fa35d0d64bbaea01fe664553ecc06 3219d74e4536658c937fd878a327257b86ce80dd git Not specified
CNA Linux Linux affected 18f84d41d34fa35d0d64bbaea01fe664553ecc06 e4b4984e28c16406ecb318444dea4a8bf47def3e git Not specified
CNA Linux Linux affected 4.2 Not specified
CNA Linux Linux unaffected 4.2 semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c4d257734e91bfcdc71d41843392dd6400b5bb1b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e4b4984e28c16406ecb318444dea4a8bf47def3e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3219d74e4536658c937fd878a327257b86ce80dd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c107233d2ff4fd7cef5d02f9124b99194957a710 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7445fe965b7d8756070a40e80f8b73348ccda1d7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6329d3a9afe715fddda0460cfa46b496d61c2fe0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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