A flaw was found in the Framebuffer Console (fbcon) in the Linux Kernel. When providing font->width and font->height greater than 32 to fbcon_set_font, since there are no checks in place, a shift-out-of-bounds occurs leading to undefined behavior and possible denial of service.

References

• https://nvd.nist.gov/vuln/detail/CVE-2023-3161
• torvalds/linux@2b09d5d
• https://bugzilla.redhat.com/show_bug.cgi?id=2213485