Detections
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CVE-2025-39764
medium
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.
References
https://git.kernel.org/stable/c/a4d634ded4d3d400f115d84f654f316f249531c9
https://git.kernel.org/stable/c/9e5021a906532ca16e2aac69c0607711e1c70b1f
https://git.kernel.org/stable/c/64b7684042246e3238464c66894e30ba30c7e851
https://git.kernel.org/stable/c/1492e3dcb2be3aa46d1963da96aa9593e4e4db5a
https://git.kernel.org/stable/c/078d33c95bf534d37aa04269d1ae6158e20082d5