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netfilter: ipset: drop logically empty buckets in mtype_del

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: drop logically empty buckets in mtype_del mtype_del() counts empty slots below n->pos in k, but it only drops the bucket when both n->pos and k are zero. This misses buckets whose live entries have all been removed while n->pos still points past deleted slots. Treat a bucket as empty when all positions below n->pos are unused and release it directly instead of shrinking it further.

Announced Source revision 1
Original source ↗

CVE-2026-31418

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-2026-31418

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": "8af1c6fbd9239877998c7f5a591cb2c88d41fb66",
        "lessThan": "c098ff857e7ca923539164af5b3c2fe3e8f8afaf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8af1c6fbd9239877998c7f5a591cb2c88d41fb66",
        "lessThan": "58f3a14826d4e6b0d5421f1a64be280b48601ea2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8af1c6fbd9239877998c7f5a591cb2c88d41fb66",
        "lessThan": "ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8af1c6fbd9239877998c7f5a591cb2c88d41fb66",
        "lessThan": "6cea34d7ec6829b62f521a37a287f670144a2233",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8af1c6fbd9239877998c7f5a591cb2c88d41fb66",
        "lessThan": "b7eef00f08b92b0b9efe8ae0df6d0005e6199323",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8af1c6fbd9239877998c7f5a591cb2c88d41fb66",
        "lessThan": "68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8af1c6fbd9239877998c7f5a591cb2c88d41fb66",
        "lessThan": "ceacaa76f221a6577aba945bb8873c2e640aeba4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8af1c6fbd9239877998c7f5a591cb2c88d41fb66",
        "lessThan": "9862ef9ab0a116c6dca98842aab7de13a252ae02",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6c717726f341fd8f39a3ec2dcf5d98d9d28a2769",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d2997d64dfa65082236bca1efd596b6c935daf5e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.4.24",
        "lessThan": "5.5",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.5.8",
        "lessThan": "5.6",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "net/netfilter/ipset/ip_set_hash_gen.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.6",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.253",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.203",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.168",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.134",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.81",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.22",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.12",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/ipset/ip_set_hash_gen.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-31418

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#28271 · Revision 1
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Publisher date
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