news.mlab.sh
Vulnerabilities
Vulnerability

CVE-2025-39764

Reference data from vuln.mlab.sh, coverage from our own index.

CVSS
5.5 Medium
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS
0.16%
Risk score
3.3
Published
2025-09-11
Status
Published

In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: remove refcounting in expectation dumpers Same pattern as previous patch: do not keep the expectation object alive via refcount, only store a cookie value and then use that as the skip hint for dump resumption. AFAICS this has the same issue as the one resolved in the conntrack dumper, when we do if (!refcount_inc_not_zero(&exp->use)) to increment the refcount, there is a chance that exp == last, which causes a double-increment of the refcount and subsequent memory leak. A flaw was found in the Linux kernel, specifically within the netfilter: ctnetlink component. A local user could exploit a vulnerability where a reference count is incorrectly incremented twice in the expectation dumpers. This double-increment leads to a memory leak. The continuous leakage of memory can ultimately cause a Denial of Service (DoS) on the affected system.

Weaknesses

CWE-911

Coverage 6

Advisories and references