Vulnerability-Lookup

CVE-2025-40287 (GCVE-0-2025-40287)

Vulnerability from cvelistv5 – Published: 2025-12-06 21:51 – Updated: 2026-05-11 21:46

Title

exfat: fix improper check of dentry.stream.valid_size

Summary

In the Linux kernel, the following vulnerability has been resolved: exfat: fix improper check of dentry.stream.valid_size We found an infinite loop bug in the exFAT file system that can lead to a Denial-of-Service (DoS) condition. When a dentry in an exFAT filesystem is malformed, the following system calls — SYS_openat, SYS_ftruncate, and SYS_pwrite64 — can cause the kernel to hang. Root cause analysis shows that the size validation code in exfat_find() does not check whether dentry.stream.valid_size is negative. As a result, the system calls mentioned above can succeed and eventually trigger the DoS issue. This patch adds a check for negative dentry.stream.valid_size to prevent this vulnerability.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/6c627bcc1896ba62e…
https://git.kernel.org/stable/c/204b1b02ee018ba52…
https://git.kernel.org/stable/c/82ebecdc74ff555da…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 11a347fb6cef62ce47e84b97c45f2b2497c7593b , < 6c627bcc1896ba62ec793d0c00da74f3c93ce3ad (git) Affected: 11a347fb6cef62ce47e84b97c45f2b2497c7593b , < 204b1b02ee018ba52ad2ece21fe3a8643d66a1b2 (git) Affected: 11a347fb6cef62ce47e84b97c45f2b2497c7593b , < 82ebecdc74ff555daf70b811d854b1f32a296bea (git)	guessed
Linux	Linux	Affected: 6.8 Unaffected: 0 , < 6.8 (semver) Unaffected: 6.12.59 , ≤ 6.12.* (semver) Unaffected: 6.17.9 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/exfat/namei.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "204b1b02ee018ba52ad2ece21fe3a8643d66a1b2",
              "status": "affected",
              "version": "11a347fb6cef62ce47e84b97c45f2b2497c7593b",
              "versionType": "git"
            },
            {
              "lessThan": "82ebecdc74ff555daf70b811d854b1f32a296bea",
              "status": "affected",
              "version": "11a347fb6cef62ce47e84b97c45f2b2497c7593b",
              "versionType": "git"
            }
          ]
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          "programFiles": [
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.59",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.59",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.9",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nexfat: fix improper check of dentry.stream.valid_size\n\nWe found an infinite loop bug in the exFAT file system that can lead to a\nDenial-of-Service (DoS) condition. When a dentry in an exFAT filesystem is\nmalformed, the following system calls \u2014 SYS_openat, SYS_ftruncate, and\nSYS_pwrite64 \u2014 can cause the kernel to hang.\n\nRoot cause analysis shows that the size validation code in exfat_find()\ndoes not check whether dentry.stream.valid_size is negative. As a result,\nthe system calls mentioned above can succeed and eventually trigger the DoS\nissue.\n\nThis patch adds a check for negative dentry.stream.valid_size to prevent\nthis vulnerability."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:46:25.955Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6c627bcc1896ba62ec793d0c00da74f3c93ce3ad"
        },
        {
          "url": "https://git.kernel.org/stable/c/204b1b02ee018ba52ad2ece21fe3a8643d66a1b2"
        },
        {
          "url": "https://git.kernel.org/stable/c/82ebecdc74ff555daf70b811d854b1f32a296bea"
        }
      ],
      "title": "exfat: fix improper check of dentry.stream.valid_size",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40287",
    "datePublished": "2025-12-06T21:51:13.328Z",
    "dateReserved": "2025-04-16T07:20:57.184Z",
    "dateUpdated": "2026-05-11T21:46:25.955Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-40287",
      "date": "2026-09-15",
      "epss": "0.00184",
      "percentile": "0.08158"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40287\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-06T22:15:56.927\",\"lastModified\":\"2026-06-17T09:21:35.990\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nexfat: fix improper check of dentry.stream.valid_size\\n\\nWe found an infinite loop bug in the exFAT file system that can lead to a\\nDenial-of-Service (DoS) condition. When a dentry in an exFAT filesystem is\\nmalformed, the following system calls \u2014 SYS_openat, SYS_ftruncate, and\\nSYS_pwrite64 \u2014 can cause the kernel to hang.\\n\\nRoot cause analysis shows that the size validation code in exfat_find()\\ndoes not check whether dentry.stream.valid_size is negative. As a result,\\nthe system calls mentioned above can succeed and eventually trigger the DoS\\nissue.\\n\\nThis patch adds a check for negative dentry.stream.valid_size to prevent\\nthis vulnerability.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/exfat/namei.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"11a347fb6cef62ce47e84b97c45f2b2497c7593b\",\"lessThan\":\"6c627bcc1896ba62ec793d0c00da74f3c93ce3ad\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"11a347fb6cef62ce47e84b97c45f2b2497c7593b\",\"lessThan\":\"204b1b02ee018ba52ad2ece21fe3a8643d66a1b2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"11a347fb6cef62ce47e84b97c45f2b2497c7593b\",\"lessThan\":\"82ebecdc74ff555daf70b811d854b1f32a296bea\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/exfat/namei.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.59\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.17.9\",\"lessThanOrEqual\":\"6.17.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/204b1b02ee018ba52ad2ece21fe3a8643d66a1b2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6c627bcc1896ba62ec793d0c00da74f3c93ce3ad\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/82ebecdc74ff555daf70b811d854b1f32a296bea\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T10:19:49+00:00",
      "cve": "CVE-2025-40287",
      "id": "CVE-2025-40287",
      "initial_release_date": "2025-12-06T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: exfat: fix improper check of dentry.stream.valid_size",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40287.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-28T16:54:20Z",
      "cve": "CVE-2025-40287",
      "id": "CVE-2025-40287",
      "initial_release_date": "2025-12-08T00:22:55Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "683",
      "product_status:known_not_affected": "187",
      "product_status:recommended": "289",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-40287",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-40287.json",
      "version": "37"
    }
  }
}

FKIE_CVE-2025-40287

Vulnerability from fkie_nvd - Published: 2025-12-06 22:15 - Updated: 2026-06-17 09:21

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/204b1b02ee018ba52ad2ece21fe3a8643d66a1b2
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6c627bcc1896ba62ec793d0c00da74f3c93ce3ad
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/82ebecdc74ff555daf70b811d854b1f32a296bea

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/exfat/namei.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6c627bcc1896ba62ec793d0c00da74f3c93ce3ad",
              "status": "affected",
              "version": "11a347fb6cef62ce47e84b97c45f2b2497c7593b",
              "versionType": "git"
            },
            {
              "lessThan": "204b1b02ee018ba52ad2ece21fe3a8643d66a1b2",
              "status": "affected",
              "version": "11a347fb6cef62ce47e84b97c45f2b2497c7593b",
              "versionType": "git"
            },
            {
              "lessThan": "82ebecdc74ff555daf70b811d854b1f32a296bea",
              "status": "affected",
              "version": "11a347fb6cef62ce47e84b97c45f2b2497c7593b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/exfat/namei.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.59",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nexfat: fix improper check of dentry.stream.valid_size\n\nWe found an infinite loop bug in the exFAT file system that can lead to a\nDenial-of-Service (DoS) condition. When a dentry in an exFAT filesystem is\nmalformed, the following system calls \u2014 SYS_openat, SYS_ftruncate, and\nSYS_pwrite64 \u2014 can cause the kernel to hang.\n\nRoot cause analysis shows that the size validation code in exfat_find()\ndoes not check whether dentry.stream.valid_size is negative. As a result,\nthe system calls mentioned above can succeed and eventually trigger the DoS\nissue.\n\nThis patch adds a check for negative dentry.stream.valid_size to prevent\nthis vulnerability."
    }
  ],
  "id": "CVE-2025-40287",
  "lastModified": "2026-06-17T09:21:35.990",
  "metrics": {},
  "published": "2025-12-06T22:15:56.927",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/204b1b02ee018ba52ad2ece21fe3a8643d66a1b2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6c627bcc1896ba62ec793d0c00da74f3c93ce3ad"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/82ebecdc74ff555daf70b811d854b1f32a296bea"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}

GHSA-VJ97-73GP-638R

Vulnerability from github – Published: 2025-12-07 00:30 – Updated: 2025-12-07 00:30

Details

In the Linux kernel, the following vulnerability has been resolved:

exfat: fix improper check of dentry.stream.valid_size

We found an infinite loop bug in the exFAT file system that can lead to a Denial-of-Service (DoS) condition. When a dentry in an exFAT filesystem is malformed, the following system calls — SYS_openat, SYS_ftruncate, and SYS_pwrite64 — can cause the kernel to hang.

Root cause analysis shows that the size validation code in exfat_find() does not check whether dentry.stream.valid_size is negative. As a result, the system calls mentioned above can succeed and eventually trigger the DoS issue.

This patch adds a check for negative dentry.stream.valid_size to prevent this vulnerability.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2025-40287"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-06T22:15:56Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nexfat: fix improper check of dentry.stream.valid_size\n\nWe found an infinite loop bug in the exFAT file system that can lead to a\nDenial-of-Service (DoS) condition. When a dentry in an exFAT filesystem is\nmalformed, the following system calls \u2014 SYS_openat, SYS_ftruncate, and\nSYS_pwrite64 \u2014 can cause the kernel to hang.\n\nRoot cause analysis shows that the size validation code in exfat_find()\ndoes not check whether dentry.stream.valid_size is negative. As a result,\nthe system calls mentioned above can succeed and eventually trigger the DoS\nissue.\n\nThis patch adds a check for negative dentry.stream.valid_size to prevent\nthis vulnerability.",
  "id": "GHSA-vj97-73gp-638r",
  "modified": "2025-12-07T00:30:56Z",
  "published": "2025-12-07T00:30:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40287"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/204b1b02ee018ba52ad2ece21fe3a8643d66a1b2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6c627bcc1896ba62ec793d0c00da74f3c93ce3ad"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82ebecdc74ff555daf70b811d854b1f32a296bea"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

MSRC_CVE-2025-40287

Vulnerability from csaf_microsoft - Published: 2025-12-02 00:00 - Updated: 2025-12-09 01:40

Summary

exfat: fix improper check of dentry.stream.valid_size

Scope

1 vulnerability in this advisory, including CVE-2025-40287.

CVE-2025-40287

Known not affected: 1 product

Open the full advisory

OPENSUSE-SU-2026:20145-1

Vulnerability from csaf_opensuse - Published: 2026-02-02 11:54 - Updated: 2026-02-02 11:54

Summary

Security update for the Linux Kernel

Severity

Important

Scope

215 vulnerabilities in this advisory, including CVE-2025-40287.

CVE-2025-40287

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Recommended: 136 products

Open the full advisory

SUSE-SU-2026:0278-1

Vulnerability from csaf_suse - Published: 2026-01-23 15:08 - Updated: 2026-01-23 15:08

Summary

Security update for the Linux Kernel

Severity

Important

Scope

395 vulnerabilities in this advisory, including CVE-2025-40287.

CVE-2025-40287

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Recommended: 10 products

Open the full advisory

SUSE-SU-2026:0281-1

Vulnerability from csaf_suse - Published: 2026-01-23 16:03 - Updated: 2026-01-23 16:03

Summary

Security update for the Linux Kernel

Severity

Important

Scope

395 vulnerabilities in this advisory, including CVE-2025-40287.

CVE-2025-40287

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Recommended: 8 products

Open the full advisory

SUSE-SU-2026:0315-1

Vulnerability from csaf_suse - Published: 2026-01-28 14:34 - Updated: 2026-01-28 14:34

Summary

Security update for the Linux Kernel

Severity

Important

Scope

395 vulnerabilities in this advisory, including CVE-2025-40287.

CVE-2025-40287

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Recommended: 56 products

Open the full advisory

SUSE-SU-2026:20207-1

Vulnerability from csaf_suse - Published: 2026-02-02 10:12 - Updated: 2026-02-02 10:12

Summary

Security update for the Linux Kernel

Severity

Important

Scope

215 vulnerabilities in this advisory, including CVE-2025-40287.

CVE-2025-40287

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Recommended: 28 products

Open the full advisory

SUSE-SU-2026:20220-1

Vulnerability from csaf_suse - Published: 2026-02-02 10:12 - Updated: 2026-02-02 10:12

Summary

Security update for the Linux Kernel

Severity

Important

Scope

215 vulnerabilities in this advisory, including CVE-2025-40287.

CVE-2025-40287

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Recommended: 114 products

Open the full advisory

SUSE-SU-2026:20228-1

Vulnerability from csaf_suse - Published: 2026-02-02 09:27 - Updated: 2026-02-02 09:27

Summary

Security update for the Linux Kernel

Severity

Important

Scope

215 vulnerabilities in this advisory, including CVE-2025-40287.

CVE-2025-40287

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Recommended: 9 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2025-40287 (GCVE-0-2025-40287)

Tags

Sightings

Nomenclature