CVE-2026-64503 iio: accel: kxsd9: fix runtime PM imbalance on write_raw() error
A local attacker can cause a runtime PM reference leak in the KXSD9 accelerometer driver, preventing device autosuspend and leading to resource exhaustion.
- 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-2026-64503?
CVE-2026-64503 is a denial of service vulnerability in Linux, published on 25 Jul 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:
iio: accel: kxsd9: fix runtime PM imbalance on write_raw() error
kxsd9_write_raw() takes a runtime PM reference with pm_runtime_get_sync() but returns -EINVAL directly when a scale with a non-zero integer part is requested, skipping the matching pm_runtime_put_autosuspend(). This leaks a runtime PM usage-counter reference on every such write, after which the device can no longer autosuspend.
Set the error code and fall through to the existing put instead of returning early.
Which versions are affected by CVE-2026-64503?
How do I fix CVE-2026-64503?
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-2026-64503 being exploited?
There is no known exploitation of CVE-2026-64503 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-64503, DEBIAN-CVE-2026-64503, GHSA-g94m-267g-8j9m, ROOT-OS-UBUNTU-2204-CVE-2026-64503, UBUNTU-CVE-2026-64503.