CVE-2026-98857 (GCVE-0-2026-98857)
Vulnerability from cvelistv5
Published
2026-10-18 15:51
Modified
2026-10-21 12:57
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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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"
          ],
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          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
            }
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        },
        {
          "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"
            },
            {
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              "status": "unaffected",
              "version": "0",
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            {
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              "status": "unaffected",
              "version": "6.6.160",
              "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",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.113",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.56",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "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": "2026-10-21T12:57:36.378Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bc9ff8e64771cc32a216953fe615386f46ac1eaa"
        },
        {
          "url": "https://git.kernel.org/stable/c/31028d7b970962fbeda1e9131405c76551094300"
        },
        {
          "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",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "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": "2026-10-21T12:57:36.378Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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