In the Linux kernel, the following vulnerability has been resolved: mtd: block2mtd: Fix divide error when erase_size is zero The erase size is… (CVE-2026-98722)

The Linux kernel's block2mtd module parses the erase_size from a module parameter, which could be set to zero. This zero value was used as a divisor in a modulo operation (size % erase_size) within add_device(), causing a divide error and kernel crash. The fix involves rejecting zero erase_size values before the modulo operation, triggering an existing error path that reports invalid arguments and frees the device safely.

Exploitation of this vulnerability causes a kernel panic due to a divide-by-zero error, resulting in a denial of service (system crash). There is no indication of privilege escalation or code execution from the provided data.

Apply the official fix that rejects zero erase_size values before performing the modulo operation. This prevents the divide error and ensures proper error reporting and device cleanup. Check the vendor advisory or Linux kernel updates for the patch and update affected systems accordingly.