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CVE-2026-90061

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

Description (CNA)

In 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.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected 65038428b2c6c5be79d3f78a6b79c0cdc3a58a41 before 9cbf6da967ec8c6e8278b70353b712980a12d848; affected 65038428b2c6c5be79d3f78a6b79c0cdc3a58a41 before 04d1930072e694d9d03bfefdb7e1ebdc872a3d0c; affected 65038428b2c6c5be79d3f78a6b79c0cdc3a58a41 before c6b56b8d549a043b6c8ff616db8748263eae05ae; affected 65038428b2c6c5be79d3f78a6b79c0cdc3a58a41 before 1e7fb6801d9cc826adcdb7fa0533c397730657f2; affected 65038428b2c6c5be79d3f78a6b79c0cdc3a58a41 before 43559058d21e0493aa220ac167e0279334dea5f9
Linux / Linuxaffected 5.7; unaffected 0 before 5.7; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.57 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through *

CWE

No CWE identifiers supplied.

References