CVE-2025-40018

Local privilege escalation via premature IPVS FTP unregister

Published Oct 24, 2025 · Updated Oct 24, 2025

Use-after-free in Linux IPVS FTP allows local users to gain kernel privileges by tearing down a crafted network namespace. __ip_vs_ftp_exit() unregisters ip_vs_ftp before live connections release their cp->app pointers, and ip_vs_unbind_app() later dereferences the freed objects. Local users can obtain the required namespace-scoped capability; exploitation enables kernel-memory disclosure, arbitrary kernel writes, control-flow hijacking, or a kernel panic.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux IPVS FTP allows local users to gain kernel privileges by tearing down a crafted network namespace. __ip_vs_ftp_exit() unregisters ip_vs_ftp before live connections release their cp->app pointers, and ip_vs_unbind_app() later dereferences the freed objects. Local users can obtain the required namespace-scoped capability; exploitation enables kernel-memory disclosure, arbitrary kernel writes, control-flow hijacking, or a kernel panic.

The record

CVE
CVE-2025-40018
Published
Oct 24, 2025
Updated
Oct 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 24, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.39
  2. Affected versionversion=61b1ab4583e275af216c8454b9256de680499b19 <134121bfd99a06d44ef5ba15a9beb075297c0821
  3. Affected versionversion=61b1ab4583e275af216c8454b9256de680499b19 <1d79471414d7b9424d699afff2aa79fff322f52d
  4. Affected versionversion=61b1ab4583e275af216c8454b9256de680499b19 <53717f8a4347b78eac6488072ad8e5adbaff38d9
  5. Affected versionversion=61b1ab4583e275af216c8454b9256de680499b19 <8cbe2a21d85727b66d7c591fd5d83df0d8c4f757
  6. Affected versionversion=61b1ab4583e275af216c8454b9256de680499b19 <a343811ef138a265407167294275201621e9ebb2
  7. Affected versionversion=61b1ab4583e275af216c8454b9256de680499b19 <dc1a481359a72ee7e548f1f5da671282a7c13b8f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.39; version=61b1ab4583e275af216c8454b9256de680499b19 <134121bfd99a06d44ef5ba15a9beb075297c0821; version=61b1ab4583e275af216c8454b9256de680499b19 <1d79471414d7b9424d699afff2aa79fff322f52d; version=61b1ab4583e275af216c8454b9256de680499b19 <53717f8a4347b78eac6488072ad8e5adbaff38d9; version=61b1ab4583e275af216c8454b9256de680499b19 <8cbe2a21d85727b66d7c591fd5d83df0d8c4f757; version=61b1ab4583e275af216c8454b9256de680499b19 <a343811ef138a265407167294275201621e9ebb2; version=61b1ab4583e275af216c8454b9256de680499b19 <dc1a481359a72ee7e548f1f5da671282a7c13b8f

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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