CVE-2026-93814 spi: core: Abort active target transfer on controller suspend
A flaw in the Linux kernel SPI subsystem can cause system hangs during suspend if an active target transfer is not aborted, requiring a kernel patch.
- 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-2026-93814?
CVE-2026-93814 is a denial of service vulnerability in Linux, published on 24 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:
spi: core: Abort active target transfer on controller suspend
When an SPI controller operating in target mode has a transfer in progress at the time of system suspend, the suspend path proceeds without aborting the ongoing transfer. This can leave the hardware in an inconsistent state, potentially causing the system to hang or fail to resume cleanly.
Fix this by invoking the controller's target_abort callback from spi_controller_suspend() when the controller is in target mode and the callback is registered. This ensures any active target transfer is cleanly terminated before the controller is suspended.
Which versions are affected by CVE-2026-93814?
How do I fix CVE-2026-93814?
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-2026-93814 being exploited?
There is no known exploitation of CVE-2026-93814 in the wild and no public exploit code.
Sources
Also known as AZL-103817, BELL-CVE-2026-93814, DEBIAN-CVE-2026-93814, GHSA-5c56-qrwc-9499, UBUNTU-CVE-2026-93814.