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CVE-2025-39764

netfilter: ctnetlink: remove refcounting in expectation dumpers

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, and 1 more
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From cf6994c2b9812a9f02b99e89df411ffc5db9c779 · fixed in b05500444b8eb97644efdd180839a04a706be97c; From cf6994c2b9812a9f02b99e89df411ffc5db9c779 · fixed in bada48ad5b0590e318d0f79636ff62a2ef9f4955; From cf6994c2b9812a9f02b99e89df411ffc5db9c779 · fixed in 64b7684042246e3238464c66894e30ba30c7e851; From cf6994c2b9812a9f02b99e89df411ffc5db9c779 · fixed in 9e5021a906532ca16e2aac69c0607711e1c70b1f; From cf6994c2b9812a9f02b99e89df411ffc5db9c779 · fixed in 078d33c95bf534d37aa04269d1ae6158e20082d5; From cf6994c2b9812a9f02b99e89df411ffc5db9c779 · fixed in a4d634ded4d3d400f115d84f654f316f249531c9; From cf6994c2b9812a9f02b99e89df411ffc5db9c779 · fixed in 1492e3dcb2be3aa46d1963da96aa9593e4e4db5a

  • Linux Linux

    2.6.23

  • KernelLinux

    From 2.6.23 · fixed in 5.10.253; From 5.11.0 · fixed in 5.15.203; From 5.16.0 · fixed in 6.1.167; From 6.2.0 · fixed in 6.6.130; From 6.7.0 · fixed in 6.12.78; From 6.13.0 · fixed in 6.16.2

References 7

git.kernel.org