CVE-2025-38685

HIGH EPSS 5.8%
Published Sep 4, 20259mo ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published Sep 4, 2025 9mo ago
Last Modified Jun 17, 2026 1w ago

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().

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
5.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 12

VendorProductVersionRange
linuxlinux_kernel*≥2.6.13  –  <5.15.190
linuxlinux_kernel*≥5.16  –  <6.1.149
linuxlinux_kernel*≥6.2  –  <6.6.103
linuxlinux_kernel*≥6.7  –  <6.12.43
linuxlinux_kernel*≥6.13  –  <6.15.11
linuxlinux_kernel*≥6.16  –  <6.16.2
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
debiandebian_linux11.0any

References 10

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-032379.html
  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-082556.html
  • git.kernel.org https://git.kernel.org/stable/c/078e62bffca4b7e72e8f3550eb063ab981c36c7a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/27b118aebdd84161c8ff5ce49d9d536f2af10754
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4c4d7ddaf1d43780b106bedc692679f965dc5a3a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/56701bf9eeb63219e378cb7fcbd066ea4eaeeb50
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/af0db3c1f898144846d4c172531a199bb3ca375d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cfec17721265e72e50cc69c6004fe3475cd38df2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ed9b8e5016230868c8d813d9179523f729fec8c6
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
    Third Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/078e62bffca4b7e72e8f3550eb063ab981c36c7a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/27b118aebdd84161c8ff5ce49d9d536f2af10754
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4c4d7ddaf1d43780b106bedc692679f965dc5a3a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/56701bf9eeb63219e378cb7fcbd066ea4eaeeb50
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/af0db3c1f898144846d4c172531a199bb3ca375d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cfec17721265e72e50cc69c6004fe3475cd38df2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ed9b8e5016230868c8d813d9179523f729fec8c6
    Patch