IT

Tracker / CVE-2025-39967

CVE-2025-39967

High 7.8

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.

Affected products and versions

linux linux_kernel
linux linux_kernel · 4.14.196 → 4.15
linux linux_kernel · 4.19.143 → 4.20
linux linux_kernel · 4.4.235 → 4.5
linux linux_kernel · 4.9.235 → 4.10
linux linux_kernel · 5.11 → 5.15.194
linux linux_kernel · 5.16 → 6.1.155
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 · 6.13 → 6.16.10
linux linux_kernel · 6.2 → 6.6.109
linux linux_kernel · 6.7 → 6.12.50

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References