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CVE-2025-40018

ipvs: Defer ip_vs_ftp unregister during netns cleanup

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.4.301, 5.10.246, 5.15.195, 6.1.156, 6.6.112, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 61b1ab4583e275af216c8454b9256de680499b19 · fixed in 8a6ecab3847c213ce2855b0378e63ce839085de3; From 61b1ab4583e275af216c8454b9256de680499b19 · fixed in 421b1ae1574dfdda68b835c15ac4921ec0030182; From 61b1ab4583e275af216c8454b9256de680499b19 · fixed in 1d79471414d7b9424d699afff2aa79fff322f52d; From 61b1ab4583e275af216c8454b9256de680499b19 · fixed in 53717f8a4347b78eac6488072ad8e5adbaff38d9; From 61b1ab4583e275af216c8454b9256de680499b19 · fixed in 8cbe2a21d85727b66d7c591fd5d83df0d8c4f757; From 61b1ab4583e275af216c8454b9256de680499b19 · fixed in dc1a481359a72ee7e548f1f5da671282a7c13b8f; From 61b1ab4583e275af216c8454b9256de680499b19 · fixed in a343811ef138a265407167294275201621e9ebb2; From 61b1ab4583e275af216c8454b9256de680499b19 · fixed in 134121bfd99a06d44ef5ba15a9beb075297c0821

  • Linux Linux

    2.6.39

  • KernelLinux

    From 2.6.39 · fixed in 5.4.301; From 5.5.0 · fixed in 5.10.246; From 5.11.0 · fixed in 5.15.195; From 5.16.0 · fixed in 6.1.156; From 6.2.0 · fixed in 6.6.112; From 6.7.0 · fixed in 6.12.53; From 6.13.0 · fixed in 6.17.3

References 8

git.kernel.org