CVE-2026-90061netfilter: nf_tables: skip double clone set expressions on element insert
Updated under an hour ago ()
Does this affect you?
It affects Linux. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 65038428b2c6c5be79d3f78a6b79c0cdc3a58a41 before c6b56b8d549a043b6c8ff616db8748263eae05ae; 65038428b2c6c5be79d3f78a6b79c0cdc3a58a41 builds before 1e7fb6801d9cc826adcdb7fa0533c397730657f2; 65038428b2c6c5be79d3f78a6b79c0cdc3a58a41 builds before 43559058d21e0493aa220ac167e0279334dea5f9 | CNA record |
References
- https://git.kernel.org/stable/c/c6b56b8d549a043b6c8ff616db8748263eae05ae
- https://git.kernel.org/stable/c/1e7fb6801d9cc826adcdb7fa0533c397730657f2
- https://git.kernel.org/stable/c/43559058d21e0493aa220ac167e0279334dea5f9
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.