CVE-2026-31389 spi: fix use-after-free on controller registration failure
A use-after-free vulnerability in the Linux kernel SPI driver allows attackers to cause denial of service or execute arbitrary code upon controller registration failure.
- 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-2026-31389?
CVE-2026-31389 is a high-severity use after free vulnerability in Linux kernel, published on 3 Apr 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: fix use-after-free on controller registration failure
Make sure to deregister from driver core also in the unlikely event that per-cpu statistics allocation fails during controller registration to avoid use-after-free (of driver resources) and unclocked register accesses.
Weakness: CWE-416
Which versions are affected by CVE-2026-31389?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31389?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-31389 being exploited?
There is no known exploitation of CVE-2026-31389 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-31389, DEBIAN-CVE-2026-31389, GHSA-7jq8-3vqq-qc62, ROOT-OS-DEBIAN-12-CVE-2026-31389, ROOT-OS-DEBIAN-13-CVE-2026-31389, ROOT-OS-UBUNTU-2404-CVE-2026-31389 and 1 more.