CVE-2025-39967
Last modified
CVE-2025-39967 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.16% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linux | Linux Kernel | >= 4.4.235, < 4.5 | — |
| Linux | Linux Kernel | >= 4.9.235, < 4.10 | — |
| Linux | Linux Kernel | >= 4.14.196, < 4.15 | — |
| Linux | Linux Kernel | >= 4.19.143, < 4.20 | — |
| Linux | Linux Kernel | >= 5.4.62, < 5.4.300 | — |
| Linux | Linux Kernel | >= 5.8.6, < 5.9 | — |
| Linux | Linux Kernel | >= 5.9.1, < 5.10.245 | — |
| Linux | Linux Kernel | >= 5.11, < 5.15.194 | — |
| Linux | Linux Kernel | >= 5.16, < 6.1.155 | — |
| Linux | Linux Kernel | >= 6.2, < 6.6.109 | — |
| Linux | Linux Kernel | >= 6.7, < 6.12.50 | — |
| Linux | Linux Kernel | >= 6.13, < 6.16.10 | — |
| Linux | Linux Kernel | 5.9 | — |
| Linux | Linux Kernel | 6.17 | Rc1 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2025-39967?
How severe is CVE-2025-39967?
How do I fix CVE-2025-39967?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2025
- CVE-2025-39961In the Linux kernel, the following vulnerability has been re…4.7
- CVE-2025-39962In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2025-39963In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2025-39964In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2025-39965In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2025-39966In the Linux kernel, the following vulnerability has been re…7
- CVE-2025-39968In the Linux kernel, the following vulnerability has been re…7.3
- CVE-2025-39969In the Linux kernel, the following vulnerability has been re…8.8
- CVE-2025-3997A vulnerability classified as problematic has been found in …5.3
- CVE-2025-39970In the Linux kernel, the following vulnerability has been re…8.8
- CVE-2025-39971In the Linux kernel, the following vulnerability has been re…8.8
- CVE-2025-39972In the Linux kernel, the following vulnerability has been re…8.8
Are you affected by CVE-2025-39967?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST