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CVE-2025-40018

HIGHCVSS 7.8/10EPSS 0.20%

Last modified

CVE-2025-40018 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.20% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.20%

9.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 61b1ab4583e275af216c8454b9256de680499b19, < 8a6ecab3847c213ce2855b0378e63ce839085de3; >= 61b1ab4583e275af216c8454b9256de680499b19, < 421b1ae1574dfdda68b835c15ac4921ec0030182; >= 61b1ab4583e275af216c8454b9256de680499b19, < 1d79471414d7b9424d699afff2aa79fff322f52d; >= 61b1ab4583e275af216c8454b9256de680499b19, < 53717f8a4347b78eac6488072ad8e5adbaff38d9; >= 61b1ab4583e275af216c8454b9256de680499b19, < 8cbe2a21d85727b66d7c591fd5d83df0d8c4f757; >= 61b1ab4583e275af216c8454b9256de680499b19, < dc1a481359a72ee7e548f1f5da671282a7c13b8f; >= 61b1ab4583e275af216c8454b9256de680499b19, < a343811ef138a265407167294275201621e9ebb2; >= 61b1ab4583e275af216c8454b9256de680499b19, < 134121bfd99a06d44ef5ba15a9beb075297c0821
LinuxLinux2.6.39

References

Timeline

Published
Last Modified
Status
Deferred

Frequently Asked Questions

What is 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.
How severe is CVE-2025-40018?
CVE-2025-40018 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.20% probability of exploitation in the next 30 days.
How do I fix CVE-2025-40018?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST