CVE-2025-40018
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.
How to fix
- Linux Linux8a6ecab3847c213ce2855b0378e63ce839085de3, 421b1ae1574dfdda68b835c15ac4921ec0030182, 1d79471414d7b9424d699afff2aa79fff322f52d, 53717f8a4347b78eac6488072ad8e5adbaff38d9, 8cbe2a21d85727b66d7c591fd5d83df0d8c4f757, dc1a481359a72ee7e548f1f5da671282a7c13b8f, a343811ef138a265407167294275201621e9ebb2, 134121bfd99a06d44ef5ba15a9beb075297c0821 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 61b1ab4583e275af216c8454b9256de680499b19 ≤ v < 8a6ecab3847c213ce2855b0378e63ce839085de3, 61b1ab4583e275af216c8454b9256de680499b19 ≤ v < 421b1ae1574dfdda68b835c15ac4921ec0030182, 61b1ab4583e275af216c8454b9256de680499b19 ≤ v < 1d79471414d7b9424d699afff2aa79fff322f52d, 61b1ab4583e275af216c8454b9256de680499b19 ≤ v < 53717f8a4347b78eac6488072ad8e5adbaff38d9, 61b1ab4583e275af216c8454b9256de680499b19 ≤ v < 8cbe2a21d85727b66d7c591fd5d83df0d8c4f757, 61b1ab4583e275af216c8454b9256de680499b19 ≤ v < dc1a481359a72ee7e548f1f5da671282a7c13b8f, 61b1ab4583e275af216c8454b9256de680499b19 ≤ v < a343811ef138a265407167294275201621e9ebb2, 61b1ab4583e275af216c8454b9256de680499b19 ≤ v < 134121bfd99a06d44ef5ba15a9beb075297c0821, 2.6.39 | 8a6ecab3847c213ce2855b0378e63ce839085de3, 421b1ae1574dfdda68b835c15ac4921ec0030182, 1d79471414d7b9424d699afff2aa79fff322f52d, 53717f8a4347b78eac6488072ad8e5adbaff38d9, 8cbe2a21d85727b66d7c591fd5d83df0d8c4f757, dc1a481359a72ee7e548f1f5da671282a7c13b8f, a343811ef138a265407167294275201621e9ebb2, 134121bfd99a06d44ef5ba15a9beb075297c0821 |
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