CVE-2025-39967

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.

• 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