Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 2.6.23, < 6.16.2 |
References
- https://git.kernel.org/stable/c/078d33c95bf534d37aa04269d1ae6158e20082d5
- https://git.kernel.org/stable/c/1492e3dcb2be3aa46d1963da96aa9593e4e4db5aPatch
- https://git.kernel.org/stable/c/64b7684042246e3238464c66894e30ba30c7e851
- https://git.kernel.org/stable/c/9e5021a906532ca16e2aac69c0607711e1c70b1f
- https://git.kernel.org/stable/c/a4d634ded4d3d400f115d84f654f316f249531c9Patch
- https://git.kernel.org/stable/c/b05500444b8eb97644efdd180839a04a706be97c
- https://git.kernel.org/stable/c/bada48ad5b0590e318d0f79636ff62a2ef9f4955
FAQ
What is CVE-2025-39764?
CVE-2025-39764 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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...
How severe is CVE-2025-39764?
CVE-2025-39764 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-39764?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.