netfilter: nf_tables: skip double clone set expressions on element insert

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90061
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:16:54 UTC
Updated2026-09-17 17:16:54 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: skip double clone set expressions on element insert Both the dynset and newsetelem path clone the existing set expressions when setting set element expressions if no override expressions are provided. This results in a double clone, once to clone the template set expressions then another clone on the new element. Add a flag to annotate if userspace provides a override expression (ie. expression of the same type of the set but different configuration), otherwise borrow the existing expression from the set. Add conditionals to release expression iif they represent an override. Use this new override_exprs flag to dump the dynset expression override to userspace. This simplifies the existing logic and it also fixes a bug with the connlimit expression which results in a module refcount imbalance WARNING splat when resorting on the default set expressions.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 65038428b2c6c5be79d3f78a6b79c0cdc3a58a41 1e7fb6801d9cc826adcdb7fa0533c397730657f2 git Not specified
CNA Linux Linux affected 65038428b2c6c5be79d3f78a6b79c0cdc3a58a41 43559058d21e0493aa220ac167e0279334dea5f9 git Not specified
CNA Linux Linux affected 5.7 Not specified
CNA Linux Linux unaffected 5.7 semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/43559058d21e0493aa220ac167e0279334dea5f9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1e7fb6801d9cc826adcdb7fa0533c397730657f2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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