cifs: Fix integer overflow while processing acdirmax mount option

{
  "id": "97b6f17b58d20a262e957cbc39e51fb384b9f7bc2b1dca43b803bd47c09ce4d5",
  "url": "https://osv.dev/vulnerability/CVE-2025-21963",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "cifs: Fix integer overflow while processing acdirmax mount option",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: cifs: Fix integer overflow while processing acdirmax mount option User-provided mount parameter acdirmax of type u32 is intended to have an upper limit, but before it is validated, the value is converted from seconds to jiffies which can lead to an integer overflow. Found by Linux Verification Center (linuxtesting.org) with SVACE.",
    "evidence": "osv:CVE-2025-21963",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.180",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.132",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.84",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.20",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.13.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-21963",
      "aliases": [
        "CVE-2025-21963"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "0c26edf477e093cefc41637f5bccc102e1a77399"
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                  "fixed": "39d086bb3558da9640ef335f97453e01d32578a1"
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                  "fixed": "9e438d0410a4002d24f420f2c28897ba2dc0af64"
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                  "fixed": "2809a79bc64964ce02e0c5f2d6bd39b9d09bdb3c"
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                {
                  "fixed": "6124cbf73e3dea7591857dd63b8ccece28952afd"
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                {
                  "fixed": "5b29891f91dfb8758baf1e2217bef4b16b2b165b"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21963.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
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                  "introduced": "5.12.0"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21963.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.450834584Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0c26edf477e093cefc41637f5bccc102e1a77399",
        "https://git.kernel.org/stable/c/2809a79bc64964ce02e0c5f2d6bd39b9d09bdb3c",
        "https://git.kernel.org/stable/c/39d086bb3558da9640ef335f97453e01d32578a1",
        "https://git.kernel.org/stable/c/5b29891f91dfb8758baf1e2217bef4b16b2b165b",
        "https://git.kernel.org/stable/c/6124cbf73e3dea7591857dd63b8ccece28952afd",
        "https://git.kernel.org/stable/c/9e438d0410a4002d24f420f2c28897ba2dc0af64",
        "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21963.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-21963",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21963.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-21963",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 509773,
  "published_at": "2025-04-01T15:46:59.773+00:00"
}