CVE-2025-40193 (GCVE-0-2025-40193)

Vulnerability from cvelistv5 – Published: 2025-11-12 21:56 – Updated: 2026-05-11 21:44
VLAI
Title
xtensa: simdisk: add input size check in proc_write_simdisk
Summary
In the Linux kernel, the following vulnerability has been resolved: xtensa: simdisk: add input size check in proc_write_simdisk A malicious user could pass an arbitrarily bad value to memdup_user_nul(), potentially causing kernel crash. This follows the same pattern as commit ee76746387f6 ("netdevsim: prevent bad user input in nsim_dev_health_break_write()")
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b6c7e873daf765e41233b9752083b66442703b7a , < f40405ccfb87b71175f2d5d004c0b8a0aebcc2cf (git)
Affected: b6c7e873daf765e41233b9752083b66442703b7a , < 151bd88859474cdaccc1e4c8b21fbf72dbba2ab4 (git)
Affected: b6c7e873daf765e41233b9752083b66442703b7a , < d381de7fd4cdc928ede96987dc64b133e6480dd6 (git)
Affected: b6c7e873daf765e41233b9752083b66442703b7a , < a0c2c36d864ef3676b05cfd8c58b72ee3214cb1a (git)
Affected: b6c7e873daf765e41233b9752083b66442703b7a , < 5d5f08fd0cd970184376bee07d59f635c8403f63 (git)
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Linux Linux Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 6.1.157 , ≤ 6.1.* (semver)
Unaffected: 6.6.113 , ≤ 6.6.* (semver)
Unaffected: 6.12.54 , ≤ 6.12.* (semver)
Unaffected: 6.17.4 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/xtensa/platforms/iss/simdisk.c"
          ],
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "3.9"
            },
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              "lessThan": "3.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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            {
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              "status": "unaffected",
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            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
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                }
              ],
              "negate": false,
              "operator": "OR"
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          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxtensa: simdisk: add input size check in proc_write_simdisk\n\nA malicious user could pass an arbitrarily bad value\nto memdup_user_nul(), potentially causing kernel crash.\n\nThis follows the same pattern as commit ee76746387f6\n(\"netdevsim: prevent bad user input in nsim_dev_health_break_write()\")"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:44:33.601Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f40405ccfb87b71175f2d5d004c0b8a0aebcc2cf"
        },
        {
          "url": "https://git.kernel.org/stable/c/151bd88859474cdaccc1e4c8b21fbf72dbba2ab4"
        },
        {
          "url": "https://git.kernel.org/stable/c/d381de7fd4cdc928ede96987dc64b133e6480dd6"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0c2c36d864ef3676b05cfd8c58b72ee3214cb1a"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d5f08fd0cd970184376bee07d59f635c8403f63"
        }
      ],
      "title": "xtensa: simdisk: add input size check in proc_write_simdisk",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40193",
    "datePublished": "2025-11-12T21:56:31.751Z",
    "dateReserved": "2025-04-16T07:20:57.178Z",
    "dateUpdated": "2026-05-11T21:44:33.601Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-10-30",
      "epss": "0.00203",
      "percentile": "0.10332"
    },
    "microsoft_vex": {
      "current_release_date": "2025-12-07T01:35:30.000Z",
      "cve": "CVE-2025-40193",
      "id": "msrc_CVE-2025-40193",
      "initial_release_date": "2025-11-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "xtensa: simdisk: add input size check in proc_write_simdisk",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-40193.json",
      "version": "2"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "arch/xtensa/platforms/iss/simdisk.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
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                ]
              },
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                "defaultStatus": "affected",
                "product": "Linux",
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                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
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                    "version": "3.9"
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                    "lessThan": "3.9",
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                    "versionType": "semver"
                  },
                  {
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                    "status": "unaffected",
                    "version": "6.1.157",
                    "versionType": "semver"
                  },
                  {
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                    "status": "unaffected",
                    "version": "6.6.113",
                    "versionType": "semver"
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              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxtensa: simdisk: add input size check in proc_write_simdisk\n\nA malicious user could pass an arbitrarily bad value\nto memdup_user_nul(), potentially causing kernel crash.\n\nThis follows the same pattern as commit ee76746387f6\n(\"netdevsim: prevent bad user input in nsim_dev_health_break_write()\")"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nxtensa: simdisk: a\u00f1adir verificaci\u00f3n del tama\u00f1o de entrada en proc_write_simdisk\n\nUn usuario malicioso podr\u00eda pasar un valor arbitrariamente incorrecto a memdup_user_nul(), causando potencialmente un fallo del kernel.\n\nEsto sigue el mismo patr\u00f3n que el commit ee76746387f6 (\u201cnetdevsim: evitar entrada de usuario incorrecta en nsim_dev_health_break_write()\u201d)"
          }
        ],
        "id": "CVE-2025-40193",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {},
        "published": "2025-11-12T22:15:46.307",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:16:52+00:00",
      "cve": "CVE-2025-40193",
      "id": "CVE-2025-40193",
      "initial_release_date": "2025-11-12T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xtensa: simdisk: add input size check in proc_write_simdisk",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40193.json",
      "version": "3"
    }
  }
}



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