CVE-2025-39764

Advisory lineage Upstream: 0 Downstream: 22
Modified
Published: 11 Sept 2025, 16:52
Last modified:14 Jul 2026, 12:42

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.15% LOW
0% probability +0.12%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

11 Sept 2025, 16:52
Published
Vulnerability first disclosed
14 Jul 2026, 12:42
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.15%• Percentile: 4%

Affected Systems

  • linux•linux

    ≥ cf6994c2b9812a9f02b99e89df411ffc5db9c779, < b05500444b8eb97644efdd180839a04a706be97c | ≥ cf6994c2b9812a9f02b99e89df411ffc5db9c779, < bada48ad5b0590e318d0f79636ff62a2ef9f4955 | ≥ cf6994c2b9812a9f02b99e89df411ffc5db9c779, < 64b7684042246e3238464c66894e30ba30c7e851 | ≥ cf6994c2b9812a9f02b99e89df411ffc5db9c779, < 9e5021a906532ca16e2aac69c0607711e1c70b1f | ≥ cf6994c2b9812a9f02b99e89df411ffc5db9c779, < 078d33c95bf534d37aa04269d1ae6158e20082d5 | ≥ cf6994c2b9812a9f02b99e89df411ffc5db9c779, < a4d634ded4d3d400f115d84f654f316f249531c9 | ≥ cf6994c2b9812a9f02b99e89df411ffc5db9c779, < 1492e3dcb2be3aa46d1963da96aa9593e4e4db5a | 2.6.23

  • linux•linux kernel

    ≥ 2.6.23, < 6.16.2 | 6.17:rc1

References (9)