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

Vulnerability from cvelistv5 – Published: 2026-10-18 15:51 – Updated: 2026-10-30 12:40
VLAI
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 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8b93288b4543ad5139a25a5b211a07bf755652dd (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f6e9446bfb79907d3092fc45a0054b0c3b329bfe (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 488eaba207dd2e4c5afc65e18dc237d70f01d283 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < bc9ff8e64771cc32a216953fe615386f46ac1eaa (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 31028d7b970962fbeda1e9131405c76551094300 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6316d17324bd4ca400c26adb7b656c6e3447c209 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 16c83c047ecfaf226ad81d45d77fa11a3184d0e4 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2a3c3de660f96865f303fd25f1285f2ffbfd521d (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (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 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "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": "2026-10-30T12:40:18.489Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/8b93288b4543ad5139a25a5b211a07bf755652dd"
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        {
          "url": "https://git.kernel.org/stable/c/f6e9446bfb79907d3092fc45a0054b0c3b329bfe"
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          "url": "https://git.kernel.org/stable/c/488eaba207dd2e4c5afc65e18dc237d70f01d283"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98857",
    "datePublished": "2026-10-18T15:51:17.262Z",
    "dateReserved": "2026-09-25T10:25:14.376Z",
    "dateUpdated": "2026-10-30T12:40:18.489Z",
    "state": "PUBLISHED"
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      "date": "2026-11-14",
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      "id": "msrc_CVE-2026-98857",
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      "source": "Microsoft CSAF VEX",
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          }
        ],
        "id": "CVE-2026-98857",
        "lastModified": "2026-10-30T13:21:31.347",
        "metrics": {},
        "published": "2026-10-18T16:17:40.150",
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        "vulnStatus": "Received"
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      "aggregate_severity": "Important",
      "current_release_date": "2026-11-05T00:23:00+00:00",
      "cve": "CVE-2026-98857",
      "id": "CVE-2026-98857",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "203",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipvs: bound LBLCR and LBLC cache growth",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98857.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-10-23T23:54:23Z",
      "cve": "CVE-2026-98857",
      "id": "CVE-2026-98857",
      "initial_release_date": "2026-10-21T16:50:55Z",
      "product_status:known_affected": "318",
      "product_status:known_not_affected": "30",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98857",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98857.json",
      "version": "3"
    }
  }
}



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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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