CVE-2025-39967

HIGH EPSS 5.1%
Published Oct 15, 20258mo ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published Oct 15, 2025 8mo ago
Last Modified Jun 17, 2026 1w 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.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
5.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-190 Integer Overflow or Wraparound Numeric Error

Affected Products 26

VendorProductVersionRange
linuxlinux_kernel*≥4.4.235  –  <4.5
linuxlinux_kernel*≥4.9.235  –  <4.10
linuxlinux_kernel*≥4.14.196  –  <4.15
linuxlinux_kernel*≥4.19.143  –  <4.20
linuxlinux_kernel*≥5.4.62  –  <5.4.300
linuxlinux_kernel*≥5.8.6  –  <5.9
linuxlinux_kernel*≥5.9.1  –  <5.10.245
linuxlinux_kernel*≥5.11  –  <5.15.194
linuxlinux_kernel*≥5.16  –  <6.1.155
linuxlinux_kernel*≥6.2  –  <6.6.109
linuxlinux_kernel*≥6.7  –  <6.12.50
linuxlinux_kernel*≥6.13  –  <6.16.10
linuxlinux_kernel5.9any
linuxlinux_kernel5.9any
linuxlinux_kernel5.9any
linuxlinux_kernel5.9any
linuxlinux_kernel5.9any
linuxlinux_kernel5.9any
linuxlinux_kernel5.9any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/1a194e6c8e1ee745e914b0b7f50fa86c89ed13fe
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4a4bac869560f943edbe3c2b032062f6673b13d3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/994bdc2d23c79087fbf7dcd9544454e8ebcef877
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9c8ec14075c5317edd6b242f1be8167aa1e4e333
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a6eb9f423b3db000aaedf83367b8539f6b72dcfc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/adac90bb1aaf45ca66f9db8ac100be16750ace78
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b8a6e85328aeb9881531dbe89bcd2637a06c3c95
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c0c01f9aa08c8e10e10e8c9ebb5be01a4eff6eb7
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1a194e6c8e1ee745e914b0b7f50fa86c89ed13fe
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4a4bac869560f943edbe3c2b032062f6673b13d3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/994bdc2d23c79087fbf7dcd9544454e8ebcef877
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9c8ec14075c5317edd6b242f1be8167aa1e4e333
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a6eb9f423b3db000aaedf83367b8539f6b72dcfc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/adac90bb1aaf45ca66f9db8ac100be16750ace78
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b8a6e85328aeb9881531dbe89bcd2637a06c3c95
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c0c01f9aa08c8e10e10e8c9ebb5be01a4eff6eb7
    Patch