spi: sn-f-ospi: Fix division by zero

{
  "id": "8ed31bd6bf4ab0bd88448d0dbccf5c37844ce313b92a7f4e95b8d1c505e510b9",
  "url": "https://osv.dev/vulnerability/CVE-2025-21793",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "spi: sn-f-ospi: Fix division by zero",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: spi: sn-f-ospi: Fix division by zero When there is no dummy cycle in the spi-nor commands, both dummy bus cycle bytes and width are zero. Because of the cpu's warning when divided by zero, the warning should be avoided. Return just zero to avoid such calculations.",
    "evidence": "osv:CVE-2025-21793",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.79",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.16",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.13.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-21793",
      "aliases": [
        "CVE-2025-21793"
      ],
      "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": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "1b74dd64c8612619e399e5a31da79a3636914495"
                },
                {
                  "fixed": "966328191b4c389c0f2159fa242915f51cbc1679"
                },
                {
                  "fixed": "4df6f005bef04a3dd16c028124a1b5684db3922b"
                },
                {
                  "fixed": "7434135553bc03809a55803ee6a8dcaae6240d55"
                },
                {
                  "fixed": "3588b1c0fde2f58d166e3f94a5a58d64b893526c"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21793.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.79"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.16"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.13.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21793.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:44.777253729Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3588b1c0fde2f58d166e3f94a5a58d64b893526c",
        "https://git.kernel.org/stable/c/4df6f005bef04a3dd16c028124a1b5684db3922b",
        "https://git.kernel.org/stable/c/7434135553bc03809a55803ee6a8dcaae6240d55",
        "https://git.kernel.org/stable/c/966328191b4c389c0f2159fa242915f51cbc1679",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21793.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-21793",
        "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-2025-21793.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-21793",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 512560,
  "published_at": "2025-02-27T02:18:30.281+00:00"
}