CVE-2025-38685 Affecting kernel-rt-modules-extra package, versions *


Severity

Recommended
0.0
high
0
10

Based on CentOS security rating.

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  • Snyk IDSNYK-CENTOS10-KERNELRTMODULESEXTRA-12491199
  • published5 Sept 2025
  • disclosed4 Sept 2025

Introduced: 4 Sep 2025

NewCVE-2025-38685  (opens in a new tab)

How to fix?

There is no fixed version for Centos:10 kernel-rt-modules-extra.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-modules-extra package and not the kernel-rt-modules-extra package as distributed by Centos. See How to fix? for Centos:10 relevant fixed versions and status.

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 Base Scores

version 3.1