CVE-2025-39967

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 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.

Package Linux Kernel
Published 2025-10-15
Last modified 2026-02-26
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

7.8

out of 10
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness type

CWE-190

CVE-2025-39967 is a Integer Overflow vulnerability

What is Integer Overflow?

The product performs a calculation that can produce an integer overflow, leading to unexpected values. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.4.62, 4.4.235, 4.9.235, 4.14.196, 4.19.143, 5.8.6, 5.9 and later are affected. Fixed in 5.4.300, 5.10.245, 5.15.194, 6.1.155, 6.6.109, 6.12.50, 6.16.10, 6.17 and their respective stable series.

Affected from
≥ 5.4.62 ≥ 4.4.235 ≥ 4.9.235 ≥ 4.14.196 ≥ 4.19.143 ≥ 5.8.6 ≥ 5.9
Fixed in
✓ 5.4.300 5.4.x ✓ 5.10.245 5.10.x ✓ 5.15.194 5.15.x ✓ 6.1.155 6.1.x ✓ 6.6.109 6.6.x ✓ 6.12.50 6.12.x ✓ 6.16.10 6.16.x ✓ 6.17

References

The following references provide additional information about CVE-2025-39967 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

8 patch commits total View all on NVD

Frequently asked questions

  • What is CVE-2025-39967?

    CVE-2025-39967 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Integer Overflow flaw (CWE-190) . It affects Linux kernel versions from 5.4.62 onward and has been patched in 5.4.300, 5.10.245, 5.15.194 and others. CVE-2025-39967 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2025-39967?

    CVE-2025-39967 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H .

  • Is there a patch available for CVE-2025-39967?

    Yes — CVE-2025-39967 has been patched. Fixed versions include 5.4.300, 5.10.245, 5.15.194 and others. If you are running Linux kernel 5.4.62 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2025-39967 actively exploited?

    No — CVE-2025-39967 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

  • What is Integer Overflow (CWE-190)?

    The product performs a calculation that can produce an integer overflow, leading to unexpected values. View CWE-190 on MITRE CWE →

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