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CVE-2025-40018— ipvs: Defer ip_vs_ftp unregister during netns cleanup

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ip_vs_ftp模块过早注销，可能导致释放后重用。

CVSS 7.8 · High EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 61b1ab4583e275af216c8454b9256de680499b19< 8a6ecab3847c213ce2855b0378e63ce839085de3 affected
61b1ab4583e275af216c8454b9256de680499b19< 421b1ae1574dfdda68b835c15ac4921ec0030182 affected
61b1ab4583e275af216c8454b9256de680499b19< 1d79471414d7b9424d699afff2aa79fff322f52d affected
61b1ab4583e275af216c8454b9256de680499b19< 53717f8a4347b78eac6488072ad8e5adbaff38d9 affected
61b1ab4583e275af216c8454b9256de680499b19< 8cbe2a21d85727b66d7c591fd5d83df0d8c4f757 affected
61b1ab4583e275af216c8454b9256de680499b19< dc1a481359a72ee7e548f1f5da671282a7c13b8f affected
61b1ab4583e275af216c8454b9256de680499b19< a343811ef138a265407167294275201621e9ebb2 affected
61b1ab4583e275af216c8454b9256de680499b19< 134121bfd99a06d44ef5ba15a9beb075297c0821 affected
… +10 more rows
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I. Basic Information for CVE-2025-40018

Vulnerability Information
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Vulnerability Title
ipvs: Defer ip_vs_ftp unregister during netns cleanup
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ip_vs_ftp模块过早注销，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 61b1ab4583e275af216c8454b9256de680499b19 ~ 8a6ecab3847c213ce2855b0378e63ce839085de3 -
Linux Linux 2.6.39 -

II. Public POCs for CVE-2025-40018

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III. Intelligence Information for CVE-2025-40018

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Patches & Fixes for CVE-2025-40018 (2)

Same Patch Batch · Linux · 2025-10-24 · 8 CVEs total

CVE-2023-53733 7.8 HIGH net: sched: cls_u32: Undo tcf_bind_filter if u32_replace_hw_knode
CVE-2025-40024 7.8 HIGH vhost: Take a reference on the task in struct vhost_task.
CVE-2025-40019 crypto: essiv - Check ssize for decryption and in-place encryption
CVE-2025-40020 can: peak_usb: fix shift-out-of-bounds issue
CVE-2025-40021 tracing: dynevent: Add a missing lockdown check on dynevent
CVE-2025-40022 crypto: af_alg - Fix incorrect boolean values in af_alg_ctx
CVE-2025-40023 drm/xe/vf: Don't expose sysfs attributes not applicable for VFs

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40018

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