CVE-2023-53310

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux30abb3d07929137bf72327560e1595508a692c4e < 0456b912121e45b3ef54abe3135e5dcb541f956caffected
LinuxLinux30abb3d07929137bf72327560e1595508a692c4e < a636c6ba9ce898207f283271cb28511206ab739baffected
LinuxLinux30abb3d07929137bf72327560e1595508a692c4e < f8319774d6f1567d6e7d03653174ab0c82c5c66daffected
LinuxLinux5.18affected
LinuxLinux0 < 5.18unaffected
LinuxLinux6.1.31 <= 6.1.*unaffected
LinuxLinux6.3.5 <= 6.3.*unaffected
LinuxLinux6.4 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References