Updated: 2026-02-27 04:31:07.270518
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.
| Links | NIST | CIRCL | RHEL | Ubuntu |
| Severity | Score | |
|---|---|---|
| CVSS Version 2.x | 0.0 | |
| CVSS Version 3.x | HIGH | 7.8 |
| OS name | Project name | Version | Score | Severity | Status | Errata | Last updated | Statement |
|---|---|---|---|---|---|---|---|---|
| AlmaLinux 9.2 ESU | kernel | 5.14.0 | 7.8 | HIGH | In Progress | 2026-02-27 16:21:38 | ||
| Oracle Linux 7 ELS | kernel | 3.10.0 | 7.8 | HIGH | Needs Triage | 2026-02-27 16:21:37 | ||
| Oracle Linux 7 ELS | kernel-uek | 5.4.17 | 7.8 | HIGH | Needs Triage | 2026-02-27 16:35:12 | ||
| TuxCare 9.6 ESU | kernel | 5.14.0 | 7.8 | HIGH | In Progress | 2026-02-28 00:52:54 | ||
| Ubuntu 16.04 ELS | linux-hwe | 4.15.0 | 7.8 | HIGH | Needs Triage | 2026-02-27 16:32:33 | ||
| Ubuntu 18.04 ELS | linux | 4.15.0 | 7.8 | HIGH | In Testing | 2026-03-06 16:39:56 | ||
| Ubuntu 20.04 ELS | linux | 5.4.0 | 7.8 | HIGH | In Testing | 2026-03-03 10:32:18 |