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CVE-2026-98420

CVE-2026-98420

waiting for further signalsZero needs more public information before it can validate it.

GHSA-h7rp-r63v-fmfm ↗EUVD-2026-101069 ↗

no check availablenot proven exploitable
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).kevAttacks confirmed in the real world.
Linux >= 5.15.145, < 5.16; >= 6.1.29, < 6.2; >= 6.2.16, < 6.3; >= 6.3.2, < 6.4; 6.4
fixed in c99ea7855124ca1428a1e59c2b4590aaef34eacf, d7fd1f98607f2cd358e583f9548bdf0173090a86, 5.16, 6.2, 6.3, 6.4
ETK-2026-2249Zero's internal tracking ID, independent of the CVE number., permanent identifier
1h 37msince last run
7mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = trigger signal
trigger signal (cve.org) +0hwaiting for further signals+155h04m
0
+2h
+4h
+6h
+8h
+10h

description

Linux kernels running the ksmbd SMB server can incorrectly handle SMB2 session lifetime during SessionSetup exchanges. A remote client can trigger resource consumption through abandoned setup sessions, while additional authenticated session setup can disrupt existing SMB connections; exposure requires ksmbd to be enabled and reachable.

mitigation

Update to a kernel release containing the fix; the advisory lists fixed versions 5.16, 6.2, 6.3, and 6.4. Until updates are deployed, disable ksmbd where it is not required or limit SMB access to trusted clients.

fixed in c99ea7855124ca1428a1e59c2b4590aaef34eacf, d7fd1f98607f2cd358e583f9548bdf0173090a86, 5.16, 6.2, 6.3, 6.4

check
no
exploit
no
automationDeterministic: a check that runs on its own, the same request on every target. Contextual: an agentic technique that needs to be applied per target, for bugs that depend on contextual flows.
contextual
auth requiredWhether an attacker needs an account first, based on the CVSS vector's Privileges Required.
–
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
–
agent run time
7m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-10-14 13:27Z
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
–
Δ to kevAttacks confirmed in the real world.
–

outcome

Contextual: an exploit technique exists, but no deterministic check could cover this one.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

  1. 2026-10-14 13:27Z
    cve_org: trigger signal, started the run
    https://www.cve.org/CVERecord?id=CVE-2026-98420

this entry in the feed

GET /api/v1/feed/CVE-2026-98420

{
  "etk_id": "ETK-2026-2249",
  "cve_id": "CVE-2026-98420",
  "display_id": "CVE-2026-98420",
  "ghsa_id": "GHSA-h7rp-r63v-fmfm",
  "euvd_id": "EUVD-2026-101069",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Improper SMB2 session expiration in Linux ksmbd",
  "summary": "Linux kernels running the ksmbd SMB server can incorrectly handle SMB2 session lifetime during SessionSetup exchanges. A remote client can trigger resource consumption through abandoned setup sessions, while additional authenticated session setup can disrupt existing SMB connections; exposure requires ksmbd to be enabled and reachable.",
  "mitigation": "Update to a kernel release containing the fix; the advisory lists fixed versions 5.16, 6.2, 6.3, and 6.4. Until updates are deployed, disable ksmbd where it is not required or limit SMB access to trusted clients.",
  "vendor": "Linux",
  "product": "Linux",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= ea174a91893956450510945a0c5d1a10b5323656, < c99ea7855124ca1428a1e59c2b4590aaef34eacf",
        ">= ea174a91893956450510945a0c5d1a10b5323656, < d7fd1f98607f2cd358e583f9548bdf0173090a86",
        "a6a9601ba995d0fec635324cb9fd8d14f9bea14e",
        "1fc8a2b14ef5223f8e0b95faba2ee0a6e4d0f99d",
        "750a2d772e9d9ff377fd32e3b6797bf2cd847a7a",
        "6775ee7ef4b37c521aa4cf3730f54554c4875542",
        ">= 5.15.145, < 5.16",
        ">= 6.1.29, < 6.2",
        ">= 6.2.16, < 6.3",
        ">= 6.3.2, < 6.4"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "c99ea7855124ca1428a1e59c2b4590aaef34eacf",
        "d7fd1f98607f2cd358e583f9548bdf0173090a86",
        "5.16",
        "6.2",
        "6.3",
        "6.4"
      ],
      "package_name": "Linux",
      "purl": null
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "6.4"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "Linux",
      "purl": null
    }
  ],
  "cwes": null,
  "cvss_score": null,
  "cvss_src": null,
  "cvss_vector": null,
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 7.430704216666666,
  "t0_at": "2026-10-14T13:27:49.599000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-14T13:27:49.599000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-14T13:27:49.599000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-98420"
    }
  }
}

published 2026-10-21 00:24Z
last change 2026-10-21 01:51Z

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