CVE-2025-40018
In the Linux kernel, the following vulnerability has been resolved: ipvs: Defer ip_vs_ftp unregister during netns cleanup On the netns cleanup path, __ip_vs_ftp_exit() may unregister ip_vs_ftp before connections with valid cp->app pointers are flushed, leading to a use-after-free. Fix this by introducing a global `exiting_module` flag, set to true in ip_vs_ftp_exit() before unregistering the pernet subsystem. In __ip_vs_ftp_exit(), skip ip_vs_ftp unregister if called during netns cleanup (when exiting_module is false) and defer it to __ip_vs_cleanup_batch(), which unregisters all apps after all connections are flushed. If called during module exit, unregister ip_vs_ftp immediately.
Affected versions
Linux kernel versions
2.6.39
and later are affected. Fixed in
5.4.301,
5.10.246,
5.15.195,
6.1.156,
6.6.112,
6.12.53,
6.17.3,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40018 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/134121bfd99a06d44ef5ba15a9beb075297c0821
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PatchKernel patch commithttps://git.kernel.org/stable/c/1d79471414d7b9424d699afff2aa79fff322f52d
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PatchKernel patch commithttps://git.kernel.org/stable/c/421b1ae1574dfdda68b835c15ac4921ec0030182
Frequently asked questions
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What is CVE-2025-40018?
CVE-2025-40018 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 2.6.39 onward and has been patched in 5.4.301, 5.10.246, 5.15.195 and others. CVE-2025-40018 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2025-40018?
Yes — CVE-2025-40018 has been patched. Fixed versions include 5.4.301, 5.10.246, 5.15.195 and others. If you are running Linux kernel 2.6.39 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40018 actively exploited?
No — CVE-2025-40018 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.