---
id: CVE-2022-49612
title: 'power: supply: core: Fix boundary conditions in interpolation'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  power: supply: core: Fix boundary conditions in interpolation

  The functions power_supply_temp2resist_simple and power_supply_ocv2cap_simple
  handle boundary conditions …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= a4585ba2050f460f749bbaf2b67bd56c41e30283 <
    a762cee5d933fe4e2e1b773d60fc74fb8248d8c4
  - >-
    Linux >= a4585ba2050f460f749bbaf2b67bd56c41e30283 <
    093d27bb6f2d1963f927ef59c9a2d37059175426
  - Linux 5.17
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T19:46:19.477904Z'
published: '2025-02-26'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T19:49:40.851Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-49612'
references:
  - url: 'https://git.kernel.org/stable/c/a762cee5d933fe4e2e1b773d60fc74fb8248d8c4'
  - url: 'https://git.kernel.org/stable/c/093d27bb6f2d1963f927ef59c9a2d37059175426'
tags:
  - cve.org
epss: 0.00277
epssPercentile: 0.20251
ingestedAt: '2026-11-05T22:38:31.580Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

power: supply: core: Fix boundary conditions in interpolation

The functions power_supply_temp2resist_simple and power_supply_ocv2cap_simple
handle boundary conditions incorrectly.
The change was introduced in a4585ba2050f460f749bbaf2b67bd56c41e30283
("power: supply: core: Use library interpolation").
There are two issues: First, the lines "high = i - 1" and "high = i" in ocv2cap
have the wrong order compared to temp2resist. As a consequence, ocv2cap
sets high=-1 if ocv>table[0].ocv, which causes an out-of-bounds read.
Second, the logic of temp2resist is also not correct.
Consider the case table[] = {{20, 100}, {10, 80}, {0, 60}}.
For temp=5, we expect a resistance of 70% by interpolation.
However, temp2resist sets high=low=2 and returns 60.

## Affected

- `Linux >= a4585ba2050f460f749bbaf2b67bd56c41e30283 < a762cee5d933fe4e2e1b773d60fc74fb8248d8c4`
- `Linux >= a4585ba2050f460f749bbaf2b67bd56c41e30283 < 093d27bb6f2d1963f927ef59c9a2d37059175426`
- `Linux 5.17`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.