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CVE-2025-39967
fbcon: fix integer overflow in fbcon_do_set_font
Description

In the Linux kernel, the following vulnerability has been resolved: fbcon: fix integer overflow in fbcon_do_set_font Fix integer overflow vulnerabilities in fbcon_do_set_font() where font size calculations could overflow when handling user-controlled font parameters. The vulnerabilities occur when: 1. CALC_FONTSZ(h, pitch, charcount) performs h * pith * charcount multiplication with user-controlled values that can overflow. 2. FONT_EXTRA_WORDS * sizeof(int) + size addition can also overflow 3. This results in smaller allocations than expected, leading to buffer overflows during font data copying. Add explicit overflow checking using check_mul_overflow() and check_add_overflow() kernel helpers to safety validate all size calculations before allocation.

INFO

Published Date :

Oct. 15, 2025, 8:15 a.m.

Last Modified :

Oct. 16, 2025, 3:29 p.m.

Remotely Exploit :

No

Source :

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

The following products are affected by CVE-2025-39967 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 integer overflow in font size calculations to prevent buffer overflows.
  • Validate all font size calculations with overflow checking.
  • Ensure safe multiplication and addition operations.
  • Apply patches to the Linux kernel.
  • Update the Linux kernel to a secure version.
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-2025-39967.

URL Resource
https://git.kernel.org/stable/c/1a194e6c8e1ee745e914b0b7f50fa86c89ed13fe
https://git.kernel.org/stable/c/4a4bac869560f943edbe3c2b032062f6673b13d3
https://git.kernel.org/stable/c/994bdc2d23c79087fbf7dcd9544454e8ebcef877
https://git.kernel.org/stable/c/9c8ec14075c5317edd6b242f1be8167aa1e4e333
https://git.kernel.org/stable/c/a6eb9f423b3db000aaedf83367b8539f6b72dcfc
https://git.kernel.org/stable/c/adac90bb1aaf45ca66f9db8ac100be16750ace78
https://git.kernel.org/stable/c/b8a6e85328aeb9881531dbe89bcd2637a06c3c95
https://git.kernel.org/stable/c/c0c01f9aa08c8e10e10e8c9ebb5be01a4eff6eb7
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-39967 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-2025-39967 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-2025-39967 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-2025-39967 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

    Oct. 15, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: fbcon: fix integer overflow in fbcon_do_set_font Fix integer overflow vulnerabilities in fbcon_do_set_font() where font size calculations could overflow when handling user-controlled font parameters. The vulnerabilities occur when: 1. CALC_FONTSZ(h, pitch, charcount) performs h * pith * charcount multiplication with user-controlled values that can overflow. 2. FONT_EXTRA_WORDS * sizeof(int) + size addition can also overflow 3. This results in smaller allocations than expected, leading to buffer overflows during font data copying. Add explicit overflow checking using check_mul_overflow() and check_add_overflow() kernel helpers to safety validate all size calculations before allocation.
    Added Reference https://git.kernel.org/stable/c/1a194e6c8e1ee745e914b0b7f50fa86c89ed13fe
    Added Reference https://git.kernel.org/stable/c/4a4bac869560f943edbe3c2b032062f6673b13d3
    Added Reference https://git.kernel.org/stable/c/994bdc2d23c79087fbf7dcd9544454e8ebcef877
    Added Reference https://git.kernel.org/stable/c/9c8ec14075c5317edd6b242f1be8167aa1e4e333
    Added Reference https://git.kernel.org/stable/c/a6eb9f423b3db000aaedf83367b8539f6b72dcfc
    Added Reference https://git.kernel.org/stable/c/adac90bb1aaf45ca66f9db8ac100be16750ace78
    Added Reference https://git.kernel.org/stable/c/b8a6e85328aeb9881531dbe89bcd2637a06c3c95
    Added Reference https://git.kernel.org/stable/c/c0c01f9aa08c8e10e10e8c9ebb5be01a4eff6eb7
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.