CVE-2025-71146
kernel: Linux kernel netfilter: Denial of Service via connection tracking resource leak
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · January 23, 2026
Updated · August 14, 2026
Description
A flaw was found in the Linux kernel's netfilter component, specifically within nf_conncount. This vulnerability allows a remote attacker to cause a resource leak by triggering specific error paths that bypass connection tracking (ct) resource reference count checks. This can lead to resource exhaustion and a Denial of Service (DoS) condition on the system.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-911 · Improper Update of Reference Count