CVE-2026-45869 power: supply: wm97xx: Fix NULL pointer dereference in power_supply_changed()
A race condition in the Linux kernel wm97xx power supply driver causes a NULL pointer dereference, leading to a system crash.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45869?
CVE-2026-45869 is a medium-severity vulnerability in Linux kernel, published on 27 May 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: wm97xx: Fix NULL pointer dereference in power_supply_changed()
In `probe()`, `request_irq()` is called before allocating/registering a `power_supply` handle. If an interrupt is fired between the call to `request_irq()` and `power_supply_register()`, the `power_supply` handle will be used uninitialized in `power_supply_changed()` in `wm97xx_bat_update()` (triggered from the interrupt handler). This will lead to a `NULL` pointer dereference since
Fix this racy `NULL` pointer dereference by making sure the IRQ is requested _after_ the registration of the `power_supply` handle. Since the IRQ is the last thing requests in the `probe()` now, remove the error path for freeing it. Instead add one for unregistering the `power_supply` handle when IRQ request fails.
Weakness: CWE-476
Which versions are affected by CVE-2026-45869?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-45869?
Apply the vendor's patch.
Is CVE-2026-45869 being exploited?
There is no known exploitation of CVE-2026-45869 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-45869, DEBIAN-CVE-2026-45869, GHSA-7c8r-gw7p-h2xw, ROOT-OS-DEBIAN-11-CVE-2026-45869, ROOT-OS-UBUNTU-2204-CVE-2026-45869, ROOT-OS-UBUNTU-2404-CVE-2026-45869 and 1 more.