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CVE-2025-40322
fbdev: bitblit: bound-check glyph index in bit_putcs*
Description

In the Linux kernel, the following vulnerability has been resolved: fbdev: bitblit: bound-check glyph index in bit_putcs* bit_putcs_aligned()/unaligned() derived the glyph pointer from the character value masked by 0xff/0x1ff, which may exceed the actual font's glyph count and read past the end of the built-in font array. Clamp the index to the actual glyph count before computing the address. This fixes a global out-of-bounds read reported by syzbot.

INFO

Published Date :

Dec. 8, 2025, 1:16 a.m.

Last Modified :

Dec. 8, 2025, 1:16 a.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2025-40322 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
Fix Linux kernel fbdev bitblit vulnerability by clamping glyph index.
  • Update the Linux kernel to the latest version.
  • Apply the provided patch for fbdev bitblit.
  • Recompile the kernel with the fix.
  • Test the system for stability.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-40322.

URL Resource
https://git.kernel.org/stable/c/0998a6cb232674408a03e8561dc15aa266b2f53b
https://git.kernel.org/stable/c/18c4ef4e765a798b47980555ed665d78b71aeadf
https://git.kernel.org/stable/c/901f44227072be60812fe8083e83e1533c04eed1
https://git.kernel.org/stable/c/9ba1a7802ca9a2590cef95b253e6526f4364477f
https://git.kernel.org/stable/c/a10cede006f9614b465cf25609a8753efbfd45cc
https://git.kernel.org/stable/c/c12003bf91fdff381c55ef54fef3e961a5af2545
https://git.kernel.org/stable/c/db5c9a162d2f42bcc842b76b3d935dcc050a0eec
https://git.kernel.org/stable/c/efaf89a75a29b2d179bf4fe63ca62852e93ad620
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-40322 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-40322 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-40322 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-40322 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Dec. 08, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: fbdev: bitblit: bound-check glyph index in bit_putcs* bit_putcs_aligned()/unaligned() derived the glyph pointer from the character value masked by 0xff/0x1ff, which may exceed the actual font's glyph count and read past the end of the built-in font array. Clamp the index to the actual glyph count before computing the address. This fixes a global out-of-bounds read reported by syzbot.
    Added Reference https://git.kernel.org/stable/c/0998a6cb232674408a03e8561dc15aa266b2f53b
    Added Reference https://git.kernel.org/stable/c/18c4ef4e765a798b47980555ed665d78b71aeadf
    Added Reference https://git.kernel.org/stable/c/901f44227072be60812fe8083e83e1533c04eed1
    Added Reference https://git.kernel.org/stable/c/9ba1a7802ca9a2590cef95b253e6526f4364477f
    Added Reference https://git.kernel.org/stable/c/a10cede006f9614b465cf25609a8753efbfd45cc
    Added Reference https://git.kernel.org/stable/c/c12003bf91fdff381c55ef54fef3e961a5af2545
    Added Reference https://git.kernel.org/stable/c/db5c9a162d2f42bcc842b76b3d935dcc050a0eec
    Added Reference https://git.kernel.org/stable/c/efaf89a75a29b2d179bf4fe63ca62852e93ad620
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.