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:
- CALC_FONTSZ(h, pitch, charcount) performs h * pith * charcount multiplication with user-controlled values that can overflow.
- FONT_EXTRA_WORDS * sizeof(int) + size addition can also overflow
- 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.
| Software | From | Fixed in |
|---|---|---|
| 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 | 5.9.x |
| linux / linux_kernel | 5.9-rc3 | 5.9-rc3.x |
| linux / linux_kernel | 5.9-rc4 | 5.9-rc4.x |
| linux / linux_kernel | 5.9-rc5 | 5.9-rc5.x |
| linux / linux_kernel | 5.9-rc6 | 5.9-rc6.x |
| linux / linux_kernel | 5.9-rc7 | 5.9-rc7.x |
| linux / linux_kernel | 5.9-rc8 | 5.9-rc8.x |
| linux / linux_kernel | 6.17-rc1 | 6.17-rc1.x |
| linux / linux_kernel | 6.17-rc2 | 6.17-rc2.x |
| linux / linux_kernel | 6.17-rc3 | 6.17-rc3.x |
| linux / linux_kernel | 6.17-rc4 | 6.17-rc4.x |
| linux / linux_kernel | 6.17-rc5 | 6.17-rc5.x |
| linux / linux_kernel | 6.17-rc6 | 6.17-rc6.x |
| linux / linux_kernel | 6.17-rc7 | 6.17-rc7.x |
- https://git.kernel.org/stable/c/1a194e6c8e1ee745e914b0b7f50fa86c89ed13fe
- https://git.kernel.org/stable/c/4a4bac869560f943edbe3c2b032062f6673b13d3
- https://git.kernel.org/stable/c/994bdc2d23c79087fbf7dcd9544454e8ebcef877
- https://git.kernel.org/stable/c/9c8ec14075c5317edd6b242f1be8167aa1e4e333
- https://git.kernel.org/stable/c/a6eb9f423b3db000aaedf83367b8539f6b72dcfc
- https://git.kernel.org/stable/c/adac90bb1aaf45ca66f9db8ac100be16750ace78
- https://git.kernel.org/stable/c/b8a6e85328aeb9881531dbe89bcd2637a06c3c95
- https://git.kernel.org/stable/c/c0c01f9aa08c8e10e10e8c9ebb5be01a4eff6eb7
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