Vulnerability-Lookup

FKIE_CVE-2026-31418

Vulnerability from fkie_nvd - Published: 2026-04-13 14:16 - Updated: 2026-05-20 19:32

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

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.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/58f3a14826d4e6b0d5421f1a64be280b48601ea2	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6cea34d7ec6829b62f521a37a287f670144a2233	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9862ef9ab0a116c6dca98842aab7de13a252ae02	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b7eef00f08b92b0b9efe8ae0df6d0005e6199323	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c098ff857e7ca923539164af5b3c2fe3e8f8afaf	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ceacaa76f221a6577aba945bb8873c2e640aeba4	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	5.6
linux	linux_kernel	5.6
linux	linux_kernel	5.6
linux	linux_kernel	5.6
linux	linux_kernel	5.6
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

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CVE-2026-31418 (GCVE-0-2026-31418)

Vulnerability from cvelistv5 – Published: 2026-04-13 13:21 – Updated: 2026-05-23 16:04

Title

netfilter: ipset: drop logically empty buckets in mtype_del

Summary

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/c098ff857e7ca9235…
https://git.kernel.org/stable/c/58f3a14826d4e6b0d…
https://git.kernel.org/stable/c/ad92ee87462f9a306…
https://git.kernel.org/stable/c/6cea34d7ec6829b62…
https://git.kernel.org/stable/c/b7eef00f08b92b0b9…
https://git.kernel.org/stable/c/68ca0eea0af02bed3…
https://git.kernel.org/stable/c/ceacaa76f221a6577…
https://git.kernel.org/stable/c/9862ef9ab0a116c6d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 , < c098ff857e7ca923539164af5b3c2fe3e8f8afaf (git) Affected: 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 , < 58f3a14826d4e6b0d5421f1a64be280b48601ea2 (git) Affected: 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 , < ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb (git) Affected: 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 , < 6cea34d7ec6829b62f521a37a287f670144a2233 (git) Affected: 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 , < b7eef00f08b92b0b9efe8ae0df6d0005e6199323 (git) Affected: 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 , < 68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4 (git) Affected: 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 , < ceacaa76f221a6577aba945bb8873c2e640aeba4 (git) Affected: 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 , < 9862ef9ab0a116c6dca98842aab7de13a252ae02 (git) Affected: 6c717726f341fd8f39a3ec2dcf5d98d9d28a2769 (git) Affected: d2997d64dfa65082236bca1efd596b6c935daf5e (git) Affected: 5.4.24 , < 5.5 (semver) Affected: 5.5.8 , < 5.6 (semver)
Linux	Linux	Affected: 5.6 Unaffected: 0 , < 5.6 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.134 , ≤ 6.6.* (semver) Unaffected: 6.12.81 , ≤ 6.12.* (semver) Unaffected: 6.18.22 , ≤ 6.18.* (semver) Unaffected: 6.19.12 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.5.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ipset: drop logically empty buckets in mtype_del\n\nmtype_del() counts empty slots below n-\u003epos in k, but it only drops the\nbucket when both n-\u003epos and k are zero. This misses buckets whose live\nentries have all been removed while n-\u003epos still points past deleted slots.\n\nTreat a bucket as empty when all positions below n-\u003epos are unused and\nrelease it directly instead of shrinking it further."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-23T16:04:57.387Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c098ff857e7ca923539164af5b3c2fe3e8f8afaf"
        },
        {
          "url": "https://git.kernel.org/stable/c/58f3a14826d4e6b0d5421f1a64be280b48601ea2"
        },
        {
          "url": "https://git.kernel.org/stable/c/ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb"
        },
        {
          "url": "https://git.kernel.org/stable/c/6cea34d7ec6829b62f521a37a287f670144a2233"
        },
        {
          "url": "https://git.kernel.org/stable/c/b7eef00f08b92b0b9efe8ae0df6d0005e6199323"
        },
        {
          "url": "https://git.kernel.org/stable/c/68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4"
        },
        {
          "url": "https://git.kernel.org/stable/c/ceacaa76f221a6577aba945bb8873c2e640aeba4"
        },
        {
          "url": "https://git.kernel.org/stable/c/9862ef9ab0a116c6dca98842aab7de13a252ae02"
        }
      ],
      "title": "netfilter: ipset: drop logically empty buckets in mtype_del",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31418",
    "datePublished": "2026-04-13T13:21:05.316Z",
    "dateReserved": "2026-03-09T15:48:24.087Z",
    "dateUpdated": "2026-05-23T16:04:57.387Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-31418

CVE-2026-31418 (GCVE-0-2026-31418)

Tags

Sightings

Nomenclature