CVE-2025-39764
netfilter: ctnetlink: remove refcounting in expectation dumpers
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 11, 2025 |
| Last Updated | Mar 25, 2026 |
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Affected Versions
Linux / Linux
cf6994c2b9812a9f02b99e89df411ffc5db9c779 < 64b7684042246e3238464c66894e30ba30c7e851 cf6994c2b9812a9f02b99e89df411ffc5db9c779 < 9e5021a906532ca16e2aac69c0607711e1c70b1f cf6994c2b9812a9f02b99e89df411ffc5db9c779 < 078d33c95bf534d37aa04269d1ae6158e20082d5 cf6994c2b9812a9f02b99e89df411ffc5db9c779 < a4d634ded4d3d400f115d84f654f316f249531c9 cf6994c2b9812a9f02b99e89df411ffc5db9c779 < 1492e3dcb2be3aa46d1963da96aa9593e4e4db5a
Linux / Linux
2.6.23
References
git.kernel.org: https://git.kernel.org/stable/c/64b7684042246e3238464c66894e30ba30c7e851 git.kernel.org: https://git.kernel.org/stable/c/9e5021a906532ca16e2aac69c0607711e1c70b1f git.kernel.org: https://git.kernel.org/stable/c/078d33c95bf534d37aa04269d1ae6158e20082d5 git.kernel.org: https://git.kernel.org/stable/c/a4d634ded4d3d400f115d84f654f316f249531c9 git.kernel.org: https://git.kernel.org/stable/c/1492e3dcb2be3aa46d1963da96aa9593e4e4db5a