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

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

https://cvefeed.io/rssfeed/latest.atom / Wed, 10/15/2025 - 11:43
CVE ID : CVE-2025-39967
Published : Oct. 15, 2025, 7:55 a.m. | 7 minutes ago
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.
Severity: 0.0 | NA
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