Improper update of reference count in Linux kernel - CVE-2026-90061
Published: September 19, 2026
Vulnerability identifier: #VU151428
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90061
CWE-ID: CWE-911
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to trigger a module reference count imbalance warning.
The vulnerability exists due to improper reference count management caused by double cloning in nf_tables set element expression handling when processing element insertions without override expressions. A local user can insert set elements without override expressions to trigger a module reference count imbalance warning.
The reported warning occurs when connlimit expressions are resorted on default set expressions.
Affected software
Linux kernel
How to mitigate CVE-2026-90061
Install security update from vendor's repository.