CVE-2025-39967In 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 calcul…
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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.
- CVSS
- 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-190
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 30, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
linux linux_kernel linux:linux_kernel | from 4.4.235 before 4.5; from 4.9.235 before 4.10; from 4.14.196 before 4.15; from 4.19.143 before 4.20; from 5.4.62 before 5.4.300; from 5.8.6 before 5.9; from 5.9.1 before 5.10.245; from 5.11 before 5.15.194; and 18 more ranges | NVD |
References
- https://git.kernel.org/stable/c/1a194e6c8e1ee745e914b0b7f50fa86c89ed13fepatch
- https://git.kernel.org/stable/c/4a4bac869560f943edbe3c2b032062f6673b13d3patch
- https://git.kernel.org/stable/c/994bdc2d23c79087fbf7dcd9544454e8ebcef877patch
- https://git.kernel.org/stable/c/9c8ec14075c5317edd6b242f1be8167aa1e4e333patch
- https://git.kernel.org/stable/c/a6eb9f423b3db000aaedf83367b8539f6b72dcfcpatch
- https://git.kernel.org/stable/c/adac90bb1aaf45ca66f9db8ac100be16750ace78patch
- https://git.kernel.org/stable/c/b8a6e85328aeb9881531dbe89bcd2637a06c3c95patch
- https://git.kernel.org/stable/c/c0c01f9aa08c8e10e10e8c9ebb5be01a4eff6eb7patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.