CVE-2026-89473 power: supply: bq25890: Fix power_supply reference leak
A reference leak in the bq25890 power supply driver can lead to resource exhaustion and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-89473?
CVE-2026-89473 is a denial of service vulnerability in Linux, published on 11 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-89473?
How do I fix CVE-2026-89473?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-89473 being exploited?
There is no known exploitation of CVE-2026-89473 in the wild and no public exploit code.
Sources
Also known as AZL-100322, BELL-CVE-2026-89473, DEBIAN-CVE-2026-89473, GHSA-82m6-wph9-4cgw, UBUNTU-CVE-2026-89473.