Divide Error Vulnerability in Linux Kernel RIVA Framebuffer Driver

CVE-2026-23266

What is CVE-2026-23266?

A divide error vulnerability exists in the RIVA framebuffer driver within the Linux kernel. This flaw occurs when a userspace program invokes the FBIOPUT_VSCREENINFO ioctl on the framebuffer device, leading to a potential crash by dividing by zero. An attacker can exploit this by presenting a malicious device that sets a bogus PRAMDAC PLL configuration, resulting in state->mclk_khz being zero. Consequently, the kernel experiences a divide error during FIFO arbitration calculation, risking system stability. Mitigation has been implemented by validating state->mclk_khz prior to division, enhancing the security of the driver.

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