Vulnerability-Lookup

FKIE_CVE-2025-38685

Vulnerability from fkie_nvd - Published: 2025-09-04 16:15 - Updated: 2026-10-19 21:10

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: fbdev: Fix vmalloc out-of-bounds write in fast_imageblit This issue triggers when a userspace program does an ioctl FBIOPUT_CON2FBMAP by passing console number and frame buffer number. Ideally this maps console to frame buffer and updates the screen if console is visible. As part of mapping it has to do resize of console according to frame buffer info. if this resize fails and returns from vc_do_resize() and continues further. At this point console and new frame buffer are mapped and sets display vars. Despite failure still it continue to proceed updating the screen at later stages where vc_data is related to previous frame buffer and frame buffer info and display vars are mapped to new frame buffer and eventully leading to out-of-bounds write in fast_imageblit(). This bheviour is excepted only when fg_console is equal to requested console which is a visible console and updates screen with invalid struct references in fbcon_putcs().

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/078e62bffca4b7e72e8f3550eb063ab981c36c7a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/27b118aebdd84161c8ff5ce49d9d536f2af10754	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4c4d7ddaf1d43780b106bedc692679f965dc5a3a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/56701bf9eeb63219e378cb7fcbd066ea4eaeeb50	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/af0db3c1f898144846d4c172531a199bb3ca375d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cfec17721265e72e50cc69c6004fe3475cd38df2	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ed9b8e5016230868c8d813d9179523f729fec8c6	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	Third Party Advisory
0b142b55-0307-4c5a-b3c9-f314f3fb7c5e	https://cert-portal.siemens.com/productcert/html/ssa-032379.html
0b142b55-0307-4c5a-b3c9-f314f3fb7c5e	https://cert-portal.siemens.com/productcert/html/ssa-082556.html

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
debian	debian_linux	11.0

JSON

To clipboard

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              "version": "6.1.149",
              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.12.43",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.15.11",
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              "versionType": "original_commit_for_fix"
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          "product": "SIMATIC CN 4100",
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          "defaultStatus": "unknown",
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          "vendor": "Siemens",
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        },
        {
          "defaultStatus": "unknown",
          "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
          "vendor": "Siemens",
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              "lessThan": "*",
              "status": "affected",
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              "versionType": "custom"
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        },
        {
          "defaultStatus": "unknown",
          "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
          "vendor": "Siemens",
          "versions": [
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              "lessThan": "*",
              "status": "affected",
              "version": "V3.1.5",
              "versionType": "custom"
            }
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        },
        {
          "defaultStatus": "unknown",
          "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
          "vendor": "Siemens",
          "versions": [
            {
              "lessThan": "*",
              "status": "affected",
              "version": "V3.1.5",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
    }
  ],
  "configurations": [
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: Fix vmalloc out-of-bounds write in fast_imageblit\n\nThis issue triggers when a userspace program does an ioctl\nFBIOPUT_CON2FBMAP by passing console number and frame buffer number.\nIdeally this maps console to frame buffer and updates the screen if\nconsole is visible.\n\nAs part of mapping it has to do resize of console according to frame\nbuffer info. if this resize fails and returns from vc_do_resize() and\ncontinues further. At this point console and new frame buffer are mapped\nand sets display vars. Despite failure still it continue to proceed\nupdating the screen at later stages where vc_data is related to previous\nframe buffer and frame buffer info and display vars are mapped to new\nframe buffer and eventully leading to out-of-bounds write in\nfast_imageblit(). This bheviour is excepted only when fg_console is\nequal to requested console which is a visible console and updates screen\nwith invalid struct references in fbcon_putcs()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfbdev: Correcci\u00f3n de escritura fuera de l\u00edmites de vmalloc en fast_imageblit\n\nEste problema se activa cuando un programa de espacio de usuario realiza un ioctl FBIOPUT_CON2FBMAP pasando el n\u00famero de consola y el n\u00famero de b\u00fafer de fotogramas. Idealmente, esto mapea la consola al b\u00fafer de fotogramas y actualiza la pantalla si la consola est\u00e1 visible.\n\nComo parte del mapeo, tiene que realizar un redimensionamiento de la consola seg\u00fan la informaci\u00f3n del b\u00fafer de fotogramas. Si este redimensionamiento falla y regresa de vc_do_resize() y contin\u00faa m\u00e1s all\u00e1. En este punto, la consola y el nuevo b\u00fafer de fotogramas est\u00e1n mapeados y establece las variables de visualizaci\u00f3n. A pesar del fallo, a\u00fan as\u00ed contin\u00faa procediendo a actualizar la pantalla en etapas posteriores donde vc_data est\u00e1 relacionado con el b\u00fafer de fotogramas anterior y la informaci\u00f3n del b\u00fafer de fotogramas y las variables de visualizaci\u00f3n est\u00e1n mapeadas al nuevo b\u00fafer de fotogramas y eventualmente llevando a una escritura fuera de l\u00edmites en fast_imageblit(). Este comportamiento se espera solo cuando fg_console es igual a la consola solicitada, que es una consola visible, y actualiza la pantalla con referencias de estructura inv\u00e1lidas en fbcon_putcs()."
    }
  ],
  "id": "CVE-2025-38685",
  "lastModified": "2026-10-19T21:10:00.160",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
        "cvssData": {
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          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-09-04T16:15:36.397",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      ],
      "url": "https://git.kernel.org/stable/c/ed9b8e5016230868c8d813d9179523f729fec8c6"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    },
    {
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"
    },
    {
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    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2025-38685 (GCVE-0-2025-38685)

Vulnerability from cvelistv5 – Published: 2025-09-04 15:32 – Updated: 2026-10-15 01:07

Title

fbdev: Fix vmalloc out-of-bounds write in fast_imageblit

Summary

Severity

7.8 (High)


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

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6641 records in the last 180 days details

References

10 references

URL	Tags
https://git.kernel.org/stable/c/078e62bffca4b7e72…
https://git.kernel.org/stable/c/4c4d7ddaf1d43780b…
https://git.kernel.org/stable/c/27b118aebdd84161c…
https://git.kernel.org/stable/c/ed9b8e5016230868c…
https://git.kernel.org/stable/c/56701bf9eeb63219e…
https://git.kernel.org/stable/c/cfec17721265e72e5…
https://git.kernel.org/stable/c/af0db3c1f89814484…
https://lists.debian.org/debian-lts-announce/2025…
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

6 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 078e62bffca4b7e72e8f3550eb063ab981c36c7a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4c4d7ddaf1d43780b106bedc692679f965dc5a3a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 27b118aebdd84161c8ff5ce49d9d536f2af10754 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ed9b8e5016230868c8d813d9179523f729fec8c6 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 56701bf9eeb63219e378cb7fcbd066ea4eaeeb50 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cfec17721265e72e50cc69c6004fe3475cd38df2 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < af0db3c1f898144846d4c172531a199bb3ca375d (git)
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.15.190 , ≤ 5.15.* (semver) Unaffected: 6.1.149 , ≤ 6.1.* (semver) Unaffected: 6.6.103 , ≤ 6.6.* (semver) Unaffected: 6.12.43 , ≤ 6.12.* (semver) Unaffected: 6.15.11 , ≤ 6.15.* (semver) Unaffected: 6.16.2 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)
Siemens	SIMATIC CN 4100	Affected: 0 , < V5.0 (custom)
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)

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          "product": "Linux",
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        {
          "url": "https://git.kernel.org/stable/c/af0db3c1f898144846d4c172531a199bb3ca375d"
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    "dateReserved": "2025-04-16T04:51:24.032Z",
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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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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