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Review reviewHigh

CVE-2025-40018

Linux

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...

CVSS
7.8
EPSS
0.14%
3.83% percentile
CISA KEV
Not listed
Published
2025.10.24
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.14%
Technical severityCVSS 7.8

Vulnerability overview

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...

Affected product and versions

Product
Linux
Affected versions
>= 61b1ab4583e275af216c8454b9256de680499b19 < 8a6ecab3847c213ce2855b0378e63ce839085de3, >= 61b1ab4583e275af216c8454b9256de680499b19 < 421b1ae1574dfdda68b835c15ac4921ec0030182, >= 61b1ab4583e275af216c8454b9256de680499b19 < 1d79471414d7b9424d699afff2aa79fff322f52d, >= 61b1ab4583e275af216c8454b9256de680499b19 < 53717f8a4347b78eac6488072ad8e5adbaff38d9, >= 61b1ab4583e275af216c8454b9256de680499b19 < 8cbe2a21d85727b66d7c591fd5d83df0d8c4f757, >= 61b1ab4583e275af216c8454b9256de680499b19 < dc1a481359a72ee7e548f1f5da671282a7c13b8f, >= 61b1ab4583e275af216c8454b9256de680499b19 < a343811ef138a265407167294275201621e9ebb2, >= 61b1ab4583e275af216c8454b9256de680499b19 < 134121bfd99a06d44ef5ba15a9beb075297c0821, >= 2.6.39
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2025-40018 — Linux | SECUFOCUS NOW