CVE-2026-98901 (GCVE-0-2026-98901)

Vulnerability from cvelistv5 – Published: 2026-10-23 11:54 – Updated: 2026-10-26 06:56
VLAI
Title
ksmbd: fix lease break and ack state handling
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix lease break and ack state handling Do not skip valid lease states containing WRITE_CACHING when breaking level-II/read leases for writes and truncates. Handle lease break acknowledgments according to the SMB2 rule that the acknowledged state must be a subset of the server's break target. Apply the acknowledged state directly and keep the break pending on failed ACKs.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7056 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 17699905a381621c1cee5b6528feb05acedc86a4 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 3251ea36df5eef58aa207fbee48849d89b922ea6 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < fba4653a0b4dc2f6d42600abe21fb326292f70ff (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 5015191096db311759fef98769270336cd8b1324 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/oplock.c",
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "17699905a381621c1cee5b6528feb05acedc86a4",
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              "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
              "versionType": "git"
            },
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          "product": "Linux",
          "programFiles": [
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            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "versionType": "semver"
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix lease break and ack state handling\n\nDo not skip valid lease states containing WRITE_CACHING when breaking\nlevel-II/read leases for writes and truncates.\n\nHandle lease break acknowledgments according to the SMB2 rule that the\nacknowledged state must be a subset of the server\u0027s break target. Apply\nthe acknowledged state directly and keep the break pending on failed ACKs."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-26T06:56:29.179Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/17699905a381621c1cee5b6528feb05acedc86a4"
        },
        {
          "url": "https://git.kernel.org/stable/c/3251ea36df5eef58aa207fbee48849d89b922ea6"
        },
        {
          "url": "https://git.kernel.org/stable/c/fba4653a0b4dc2f6d42600abe21fb326292f70ff"
        },
        {
          "url": "https://git.kernel.org/stable/c/5015191096db311759fef98769270336cd8b1324"
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      ],
      "title": "ksmbd: fix lease break and ack state handling",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98901",
    "datePublished": "2026-10-23T11:54:11.554Z",
    "dateReserved": "2026-09-25T10:25:14.379Z",
    "dateUpdated": "2026-10-26T06:56:29.179Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-98901",
      "date": "2026-10-26",
      "epss": "0.00174",
      "percentile": "0.06822"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-24T14:46:42.000Z",
      "cve": "CVE-2026-98901",
      "id": "msrc_CVE-2026-98901",
      "initial_release_date": "2026-10-24T01:05:05.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ksmbd: fix lease break and ack state handling",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98901.json",
      "version": "3"
    },
    "nvd": {
      "cve": {
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            "affectedData": [
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                "product": "Linux",
                "programFiles": [
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                  "fs/smb/server/smb2pdu.c"
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                    "versionType": "semver"
                  },
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                    "versionType": "semver"
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                    "lessThanOrEqual": "6.12.*",
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                    "versionType": "semver"
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix lease break and ack state handling\n\nDo not skip valid lease states containing WRITE_CACHING when breaking\nlevel-II/read leases for writes and truncates.\n\nHandle lease break acknowledgments according to the SMB2 rule that the\nacknowledged state must be a subset of the server\u0027s break target. Apply\nthe acknowledged state directly and keep the break pending on failed ACKs."
          }
        ],
        "id": "CVE-2026-98901",
        "lastModified": "2026-10-26T07:17:15.457",
        "metrics": {},
        "published": "2026-10-23T12:18:24.143",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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