CVE-2023-53310: power: supply: axp288_fuel_gauge: Fix external_power_changed race

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-09-16 · updated 2026-06-17
Weakness: CWE-362

Description

In the Linux kernel, the following vulnerability has been resolved: power: supply: axp288_fuel_gauge: Fix external_power_changed race fuel_gauge_external_power_changed() dereferences info->bat, which gets sets in axp288_fuel_gauge_probe() like this: info->bat = devm_power_supply_register(dev, &fuel_gauge_desc, &psy_cfg); As soon as devm_power_supply_register() has called device_add() the external_power_changed callback can get called. So there is a window where fuel_gauge_external_power_changed() may get called while info->bat has not been set yet leading to a NULL pointer dereference. Fixing this is easy. The external_power_changed callback gets passed the power_supply which will eventually get stored in info->bat, so fuel_gauge_external_power_changed() can simply directly use the passed in psy argument which is always valid.

Affected products

Linux kernel: from 5.18 before 6.1.31; from 6.2 before 6.3.5; 6.4-rc1, 6.4-rc2, 6.4-rc3 — fixed in 6.1.31, 6.3.5

How to fix

Upgrade to a fixed version: Linux kernel 6.1.31, 6.3.5. Check the vendor advisory for mitigations.

References

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