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CVE-2026-89473: power: supply: bq25890: Fix power_supply reference leak

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: power: supply: bq25890: Fix power_supply reference leak bq25890_fw_probe() acquires a reference to a secondary charger using power_supply_get_by_name(), but the reference is not released on later probe failures or on driver detach. In particular, failures after bq25890_fw_probe() returns successfully, such as a failure in bq25890_hw_init(), also leak the reference. Register a device-managed cleanup action immediately after acquiring the secondary charger. This releases the reference on all subsequent probe failures and on driver detach. Found by code review.

Affected products

• Linux kernel: 6.3 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/238320ad029a3eedabb86286a28cab55bca629b9
• https://git.kernel.org/stable/c/58f1025eca92734eadc063715b98f62538286468
• https://git.kernel.org/stable/c/81b558afda9321c1a70971a39071d156f3e26950
• https://git.kernel.org/stable/c/863c32a83e4235eb0cbf6106f2b124e645302156
• https://git.kernel.org/stable/c/976c10d883a02968f3f58be0cee499d1fd2ba68a

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