CVE-2026-31770

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> hwmon: (occ) Fix division by zero in occ_show_power_1()<br /> <br /> In occ_show_power_1() case 1, the accumulator is divided by<br /> update_tag without checking for zero. If no samples have been<br /> collected yet (e.g. during early boot when the sensor block is<br /> included but hasn&amp;#39;t been updated), update_tag is zero, causing<br /> a kernel divide-by-zero crash.<br /> <br /> The 2019 fix in commit 211186cae14d ("hwmon: (occ) Fix division by<br /> zero issue") only addressed occ_get_powr_avg() used by<br /> occ_show_power_2() and occ_show_power_a0(). This separate code<br /> path in occ_show_power_1() was missed.<br /> <br /> Fix this by reusing the existing occ_get_powr_avg() helper, which<br /> already handles the zero-sample case and uses mul_u64_u32_div()<br /> to multiply before dividing for better precision. Move the helper<br /> above occ_show_power_1() so it is visible at the call site.<br /> <br /> [groeck: Fix alignment problems reported by checkpatch]