ksmbd: fix lease break and ack state handling

{
  "id": "3a8379dff667acc17167ebbaa1d0034bf2bc27376fb8bac613c721a2c718a891",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-98901",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "cve:CVE-2026-98901",
    "products": [
      {
        "name": {
          "value": "Linux",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "Linux",
          "evidence": "/containers/cna/affected/1/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98901",
      "aliases": [
        "CVE-2026-98901"
      ],
      "metrics": [],
      "affected": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
              "lessThan": "17699905a381621c1cee5b6528feb05acedc86a4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
              "lessThan": "3251ea36df5eef58aa207fbee48849d89b922ea6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
              "lessThan": "fba4653a0b4dc2f6d42600abe21fb326292f70ff",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
              "lessThan": "5015191096db311759fef98769270336cd8b1324",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/smb/server/oplock.c",
            "fs/smb/server/smb2pdu.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.15",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/smb/server/oplock.c",
            "fs/smb/server/smb2pdu.c"
          ],
          "defaultStatus": "affected"
        }
      ],
      "modified": "2026-10-26T06:56:29.179Z",
      "provider": "cve",
      "references": [
        "https://git.kernel.org/stable/c/17699905a381621c1cee5b6528feb05acedc86a4",
        "https://git.kernel.org/stable/c/3251ea36df5eef58aa207fbee48849d89b922ea6",
        "https://git.kernel.org/stable/c/fba4653a0b4dc2f6d42600abe21fb326292f70ff",
        "https://git.kernel.org/stable/c/5015191096db311759fef98769270336cd8b1324"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "shortName": "Linux",
          "dateUpdated": "2026-10-26T06:56:29.179Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98901",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-cve",
  "document_id": 263359,
  "published_at": "2026-10-23T11:54:11.554+00:00"
}