Medium 5.5Published May 1, 2026

CVE-2026-31770hwmon: (occ) Fix division by zero in occ_show_power_1()

Updated under an hour ago (Oct 27, 2026, 3:10 PM ET)

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Exploited in the last 30 days

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]

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from c10e753d43ebd1d17e1c62bcee20c6124c2c7cca before c7d3712362c8ab8f82f441b649d9e446e7b9aa9d; from c10e753d43ebd1d17e1c62bcee20c6124c2c7cca before 53e6175756b8c474b6247bbcea0aad3d68357475; from c10e753d43ebd1d17e1c62bcee20c6124c2c7cca before 2502684b9e835de9a992ec47c3e6c6faabe3858d; from c10e753d43ebd1d17e1c62bcee20c6124c2c7cca before 37ae8fadc74ed68e5bc364ffd17746d88e449ae3; from c10e753d43ebd1d17e1c62bcee20c6124c2c7cca before bbbefc48f6617cfb738dcff7f44beb50b5dfeb38; from c10e753d43ebd1d17e1c62bcee20c6124c2c7cca before 243d55bd3f08cb15eee9d63f4716d4d4cdd760f5; from c10e753d43ebd1d17e1c62bcee20c6124c2c7cca before 7b89ce0c98bf3015f493ca4285b2d1056cd8c733; from c10e753d43ebd1d17e1c62bcee20c6124c2c7cca before 39e2a5bf970402a8530a319cf06122e216ba57b8	CNA record
linux linux_kernel linux:linux_kernel	from 5.0 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12; 7.0; and 5 more ranges	NVD

References

References

https://git.kernel.org/stable/c/c7d3712362c8ab8f82f441b649d9e446e7b9aa9d	patch
https://git.kernel.org/stable/c/53e6175756b8c474b6247bbcea0aad3d68357475	patch
https://git.kernel.org/stable/c/2502684b9e835de9a992ec47c3e6c6faabe3858d	patch
https://git.kernel.org/stable/c/37ae8fadc74ed68e5bc364ffd17746d88e449ae3	patch
https://git.kernel.org/stable/c/bbbefc48f6617cfb738dcff7f44beb50b5dfeb38	patch
https://git.kernel.org/stable/c/243d55bd3f08cb15eee9d63f4716d4d4cdd760f5	patch
https://git.kernel.org/stable/c/7b89ce0c98bf3015f493ca4285b2d1056cd8c733	patch
https://git.kernel.org/stable/c/39e2a5bf970402a8530a319cf06122e216ba57b8	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.