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Back to active CVEs
High · CVSS 7.8CVE-2025-38685

fbdev: Fix vmalloc out-of-bounds write in fast_imageblitCVE-2025-38685

Answer in brief

CVE-2025-38685 records a High severity (CVSS 7.8) vulnerability in fbdev: Fix vmalloc out-of-bounds write in fast_imageblit. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC CN 4100 (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 4, 2025Updated Oct 19, 2026Source checked Nov 5, 2026First seen by HOL Aug 5, 2026Material review Oct 19, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.8
Exploitation
Not marked as known exploited
Affected software
13 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC CN 4100 (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <078e62bffca4b7e72e8f3550eb063ab981c36c7a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4c4d7ddaf1d43780b106bedc692679f965dc5a3a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <27b118aebdd84161c8ff5ce49d9d536f2af10754 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ed9b8e5016230868c8d813d9179523f729fec8c6 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <56701bf9eeb63219e378cb7fcbd066ea4eaeeb50 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cfec17721265e72e50cc69c6004fe3475cd38df2 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <af0db3c1f898144846d4c172531a199bb3ca375d078e62bffca4b7e72e8f3550eb063ab981c36c7a, 4c4d7ddaf1d43780b106bedc692679f965dc5a3a, 27b118aebdd84161c8ff5ce49d9d536f2af10754, ed9b8e5016230868c8d813d9179523f729fec8c6, 56701bf9eeb63219e378cb7fcbd066ea4eaeeb50, cfec17721265e72e50cc69c6004fe3475cd38df2, af0db3c1f898144846d4c172531a199bb3ca375d
Linux/Linuxgeneric2.6.12Not reported
Siemens/SIMATIC CN 4100generic>=0 <V5.0V5.0
Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric>=V3.1.5 <**
Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric>=V3.1.5 <**
Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric>=V3.1.5 <**

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Siemens/SIMATIC CN 4100.
  2. 2Review the reported fix. Update Linux/Linux to 078e62bffca4b7e72e8f3550eb063ab981c36c7a; Siemens/SIMATIC CN 4100 to V5.0; Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP to *; Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP to *; Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFP to * if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 4, 2025

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 5, 2026

Sources and claim methodology

  • Source referencecert-portal.siemens.com
  • Source referencecert-portal.siemens.com
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencelists.debian.org
Upstream source description

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().

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-787
Source
CVE List V5
Source checked
Nov 5, 2026
References
10 linked sources
Open source record