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

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/134121bfd99a06d44ef5ba15a9beb075297c0821 cve-icon cve-icon
https://git.kernel.org/stable/c/1d79471414d7b9424d699afff2aa79fff322f52d cve-icon cve-icon
https://git.kernel.org/stable/c/53717f8a4347b78eac6488072ad8e5adbaff38d9 cve-icon cve-icon
https://git.kernel.org/stable/c/8cbe2a21d85727b66d7c591fd5d83df0d8c4f757 cve-icon cve-icon
https://git.kernel.org/stable/c/a343811ef138a265407167294275201621e9ebb2 cve-icon cve-icon
https://git.kernel.org/stable/c/dc1a481359a72ee7e548f1f5da671282a7c13b8f cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025102433-CVE-2025-40018-96db@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-40018 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-40018 cve-icon
History

Mon, 27 Oct 2025 22:30:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Vendors & Products Linux
Linux linux Kernel

Sat, 25 Oct 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Important

Fri, 24 Oct 2025 12:00:00 +0000

Type Values Removed Values Added
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.
Title ipvs: Defer ip_vs_ftp unregister during netns cleanup
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-10-24T11:44:28.955Z

Updated: 2025-10-24T11:44:28.955Z

Reserved: 2025-04-16T07:20:57.152Z

Link: CVE-2025-40018

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-10-24T12:15:37.703

Modified: 2025-10-27T13:20:15.637

Link: CVE-2025-40018

cve-icon Redhat

Severity : Important

Publid Date: 2025-10-24T00:00:00Z

Links: CVE-2025-40018 - Bugzilla