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ipvs: Defer ip_vs_ftp unregister during netns cleanup

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2025-40018

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-40018

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "61b1ab4583e275af216c8454b9256de680499b19",
        "lessThan": "8a6ecab3847c213ce2855b0378e63ce839085de3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "61b1ab4583e275af216c8454b9256de680499b19",
        "lessThan": "421b1ae1574dfdda68b835c15ac4921ec0030182",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "61b1ab4583e275af216c8454b9256de680499b19",
        "lessThan": "1d79471414d7b9424d699afff2aa79fff322f52d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "61b1ab4583e275af216c8454b9256de680499b19",
        "lessThan": "53717f8a4347b78eac6488072ad8e5adbaff38d9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "61b1ab4583e275af216c8454b9256de680499b19",
        "lessThan": "8cbe2a21d85727b66d7c591fd5d83df0d8c4f757",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "61b1ab4583e275af216c8454b9256de680499b19",
        "lessThan": "dc1a481359a72ee7e548f1f5da671282a7c13b8f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "61b1ab4583e275af216c8454b9256de680499b19",
        "lessThan": "a343811ef138a265407167294275201621e9ebb2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "61b1ab4583e275af216c8454b9256de680499b19",
        "lessThan": "134121bfd99a06d44ef5ba15a9beb075297c0821",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/ipvs/ip_vs_ftp.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.39"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.39",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.4.301",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.246",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.195",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.156",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.17.3",
        "versionType": "semver",
        "lessThanOrEqual": "6.17.*"
      },
      {
        "status": "unaffected",
        "version": "6.18",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/ipvs/ip_vs_ftp.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-40018

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30660 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement