CVE-2026-90061
UnknownSummary
In the Linux kernel, in netfilter nf_tables 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. The fix adds an override_exprs flag to annotate override expressions and conditionally releases expressions, also fixing a module refcount imbalance for the connlimit expression.
Risk Assessment
A module refcount imbalance can lead to kernel warnings and, in extreme cases, use of a freed module and system crash. Affects nf_tables configurations using the connlimit expression.
Recommendation
Update the Linux kernel to a version with the fix that introduces the override_exprs flag and conditional expression release. Verify system stability when using nf_tables rules with connlimit.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS