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

Vulnerability from cvelistv5 – Published: 2025-09-04 15:32 – Updated: 2026-08-05 12:03
VLAI
Title
fbdev: Fix vmalloc out-of-bounds write in fast_imageblit
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().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted 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)
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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)
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Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Party Advisory\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-032379.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-082556.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T09:02:51+00:00",
      "cve": "CVE-2025-38685",
      "id": "CVE-2025-38685",
      "initial_release_date": "2025-09-04T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fbdev: Fix vmalloc out-of-bounds write in fast_imageblit",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38685.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-25T00:42:36Z",
      "cve": "CVE-2025-38685",
      "id": "CVE-2025-38685",
      "initial_release_date": "2025-09-04T23:24:06Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "356",
      "product_status:known_not_affected": "66",
      "product_status:recommended": "837",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38685",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38685.json",
      "version": "52"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.