CVE-2026-31770 Details
Description
In the Linux kernel, the following vulnerability has been resolved: hwmon: (occ) Fix division by zero in occ_show_power_1() In occ_show_power_1() case 1, the accumulator is divided by update_tag without checking for zero. If no samples have been collected yet (e.g. during early boot when the sensor block is included but hasn't been updated), update_tag is zero, causing a kernel divide-by-zero crash. The 2019 fix in commit 211186cae14d ("hwmon: (occ) Fix division by zero issue") only addressed occ_get_powr_avg() used by occ_show_power_2() and occ_show_power_a0(). This separate code path in occ_show_power_1() was missed. Fix this by reusing the existing occ_get_powr_avg() helper, which already handles the zero-sample case and uses mul_u64_u32_div() to multiply before dividing for better precision. Move the helper above occ_show_power_1() so it is visible at the call site. [groeck: Fix alignment problems reported by checkpatch]
A division by zero vulnerability has been identified in the Linux kernel's OCC power reporting within the hwmon subsystem. This issue occurs in the 'occ_show_power_1()' function, where the accumulator is divided by the update tag without verifying if the update tag is zero. During early boot, when sensor data has not yet been updated, this can lead to a kernel crash due to the divide-by-zero error. Although a fix was implemented in 2019 for similar issues in other power reporting functions, this particular case was overlooked. The vulnerability affects the Linux kernel stable tree.
Users can upgrade to the latest version of the Linux kernel stable tree, where this vulnerability has been addressed. Instructions for downloading the patched version are available on the official Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/243d55bd3f08cb15eee9d63f4716d4d4cdd760f5 | kernel.org | Patch |
| https://git.kernel.org/stable/c/2502684b9e835de9a992ec47c3e6c6faabe3858d | kernel.org | Patch |
| https://git.kernel.org/stable/c/37ae8fadc74ed68e5bc364ffd17746d88e449ae3 | kernel.org | Patch |
| https://git.kernel.org/stable/c/39e2a5bf970402a8530a319cf06122e216ba57b8 | kernel.org | Patch |
| https://git.kernel.org/stable/c/53e6175756b8c474b6247bbcea0aad3d68357475 | kernel.org | Patch |
| https://git.kernel.org/stable/c/7b89ce0c98bf3015f493ca4285b2d1056cd8c733 | kernel.org | Patch |
| https://git.kernel.org/stable/c/bbbefc48f6617cfb738dcff7f44beb50b5dfeb38 | kernel.org | Patch |
| https://git.kernel.org/stable/c/c7d3712362c8ab8f82f441b649d9e446e7b9aa9d | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-369 | Divide By Zero | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 5.0, < 5.10.253 >= 5.11, < 5.15.203 >= 5.16, < 6.1.168 >= 6.2, < 6.6.134 >= 6.7, < 6.12.81 >= 6.13, < 6.18.22 >= 6.19, < 6.19.12 7.0 rc1 7.0 rc2 7.0 rc3 7.0 rc4 7.0 rc5 7.0 rc6 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 11, 2026 | Initial Analysis | [email protected] |
| May 1, 2026 | New CVE Received | kernel.org |