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CVE-2025-39967

7.8 · HIGH

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 ca…

Published Oct 15, 2025CWE-190EPSS 0.17%

Overview

CVE-2025-39967 is a high-severity vulnerability. It was published on October 15, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1a194e6c8e1ee745e914b0b7f50fa86c89ed13feRefgit.kernel.org/stable/c/4a4bac869560f943edbe3c2b032062f6673b13d3Refgit.kernel.org/stable/c/994bdc2d23c79087fbf7dcd9544454e8ebcef877Refgit.kernel.org/stable/c/9c8ec14075c5317edd6b242f1be8167aa1e4e333Refgit.kernel.org/stable/c/a6eb9f423b3db000aaedf83367b8539f6b72dcfcRefgit.kernel.org/stable/c/adac90bb1aaf45ca66f9db8ac100be16750ace78Refgit.kernel.org/stable/c/b8a6e85328aeb9881531dbe89bcd2637a06c3c95Refgit.kernel.org/stable/c/c0c01f9aa08c8e10e10e8c9ebb5be01a4eff6eb7

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39967?

CVE-2025-39967 is a high-severity vulnerability. It was published on October 15, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-39967?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-39967?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-39967?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39967 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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