Vulnerability-Lookup

GHSA-3QGH-GJJ6-QJ8R

Vulnerability from github – Published: 2026-10-18 18:32 – Updated: 2026-10-18 18:32

Details

In the Linux kernel, the following vulnerability has been resolved:

ipvs: bound LBLCR and LBLC cache growth

ip_vs_lblcr_new() and ip_vs_lblc_new() create cache entries for every previously unseen destination address. The table max_size only tells the periodic collector to reclaim entries after the cache has already exceeded the limit. It does not reclaim entries that the attacker continues to use.

Reject new cache entries once either table reaches max_size * 3 / 2. The extra headroom lets the periodic collector catch up while the existing scheduler fallback continues to use the selected destination when cache creation fails. New traffic therefore stays serviceable without growing the tables further.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98857"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:40Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: bound LBLCR and LBLC cache growth\n\nip_vs_lblcr_new() and ip_vs_lblc_new() create cache entries for\nevery previously unseen destination address. The table max_size only\ntells the periodic collector to reclaim entries after the cache has\nalready exceeded the limit. It does not reclaim entries that the\nattacker continues to use.\n\nReject new cache entries once either table reaches max_size * 3 / 2.\nThe extra headroom lets the periodic collector catch up while the\nexisting scheduler fallback continues to use the selected destination\nwhen cache creation fails. New traffic therefore stays serviceable\nwithout growing the tables further.",
  "id": "GHSA-3qgh-gjj6-qj8r",
  "modified": "2026-10-18T18:32:06Z",
  "published": "2026-10-18T18:32:06Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98857"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16c83c047ecfaf226ad81d45d77fa11a3184d0e4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a3c3de660f96865f303fd25f1285f2ffbfd521d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/31028d7b970962fbeda1e9131405c76551094300"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6316d17324bd4ca400c26adb7b656c6e3447c209"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98857 (GCVE-0-2026-98857)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:51 – Updated: 2026-10-18 15:51

Title

ipvs: bound LBLCR and LBLC cache growth

Summary

In the Linux kernel, the following vulnerability has been resolved: ipvs: bound LBLCR and LBLC cache growth ip_vs_lblcr_new() and ip_vs_lblc_new() create cache entries for every previously unseen destination address. The table max_size only tells the periodic collector to reclaim entries after the cache has already exceeded the limit. It does not reclaim entries that the attacker continues to use. Reject new cache entries once either table reaches max_size * 3 / 2. The extra headroom lets the periodic collector catch up while the existing scheduler fallback continues to use the selected destination when cache creation fails. New traffic therefore stays serviceable without growing the tables further.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7100 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/31028d7b970962fbe…
https://git.kernel.org/stable/c/6316d17324bd4ca40…
https://git.kernel.org/stable/c/16c83c047ecfaf226…
https://git.kernel.org/stable/c/2a3c3de660f96865f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 31028d7b970962fbeda1e9131405c76551094300 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6316d17324bd4ca400c26adb7b656c6e3447c209 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 16c83c047ecfaf226ad81d45d77fa11a3184d0e4 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2a3c3de660f96865f303fd25f1285f2ffbfd521d (git)
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 6.12.113 , ≤ 6.12.* (semver) Unaffected: 6.18.56 , ≤ 6.18.* (semver) Unaffected: 7.2.10 , ≤ 7.2.* (semver) Unaffected: 7.3-rc6 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/ipvs/ip_vs_lblc.c",
            "net/netfilter/ipvs/ip_vs_lblcr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "31028d7b970962fbeda1e9131405c76551094300",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "6316d17324bd4ca400c26adb7b656c6e3447c209",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "16c83c047ecfaf226ad81d45d77fa11a3184d0e4",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "2a3c3de660f96865f303fd25f1285f2ffbfd521d",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/ipvs/ip_vs_lblc.c",
            "net/netfilter/ipvs/ip_vs_lblcr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc6",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.113",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
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                },
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                }
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              "operator": "OR"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: bound LBLCR and LBLC cache growth\n\nip_vs_lblcr_new() and ip_vs_lblc_new() create cache entries for\nevery previously unseen destination address. The table max_size only\ntells the periodic collector to reclaim entries after the cache has\nalready exceeded the limit. It does not reclaim entries that the\nattacker continues to use.\n\nReject new cache entries once either table reaches max_size * 3 / 2.\nThe extra headroom lets the periodic collector catch up while the\nexisting scheduler fallback continues to use the selected destination\nwhen cache creation fails. New traffic therefore stays serviceable\nwithout growing the tables further."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-18T15:51:17.262Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/31028d7b970962fbeda1e9131405c76551094300"
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          "url": "https://git.kernel.org/stable/c/6316d17324bd4ca400c26adb7b656c6e3447c209"
        },
        {
          "url": "https://git.kernel.org/stable/c/16c83c047ecfaf226ad81d45d77fa11a3184d0e4"
        },
        {
          "url": "https://git.kernel.org/stable/c/2a3c3de660f96865f303fd25f1285f2ffbfd521d"
        }
      ],
      "title": "ipvs: bound LBLCR and LBLC cache growth",
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      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98857",
    "datePublished": "2026-10-18T15:51:17.262Z",
    "dateReserved": "2026-09-25T10:25:14.376Z",
    "dateUpdated": "2026-10-18T15:51:17.262Z",
    "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.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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