SB20260919160 - Improper update of reference count in Linux kernel netfilter

Description

This security bulletin contains information about 1 vulnerability.

1) Improper update of reference count (CVE-ID: CVE-2026-90061)

CWE-ID: CWE-911 - Improper Update of Reference Count

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/1e7fb6801d9cc826adcdb7fa0533c397730657f2
• https://git.kernel.org/stable/c/43559058d21e0493aa220ac167e0279334dea5f9