CVE-2026-23068 spi: spi-sprd-adi: Fix double free in probe error path
A double-free vulnerability in the Linux kernel's SPI driver allows attackers to cause a denial of service or potentially execute code via a failed probe path.
- 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-2026-23068?
CVE-2026-23068 is a high-severity use after free vulnerability in Linux kernel, published on 4 Feb 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: spi-sprd-adi: Fix double free in probe error path
The driver currently uses spi_alloc_host() to allocate the controller but registers it using devm_spi_register_controller().
If devm_register_restart_handler() fails, the code jumps to the put_ctlr label and calls spi_controller_put(). However, since the controller was registered via a devm function, the device core will automatically call spi_controller_put() again when the probe fails. This results in a double-free of the spi_controller structure.
Fix this by switching to devm_spi_alloc_host() and removing the manual spi_controller_put() call.
Weakness: CWE-415
Which versions are affected by CVE-2026-23068?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23068?
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-2026-23068 being exploited?
There is no known exploitation of CVE-2026-23068 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-77163, BELL-CVE-2026-23068, DEBIAN-CVE-2026-23068, GHSA-2r6w-8qqx-7jq3, ROOT-OS-DEBIAN-11-CVE-2026-23068, ROOT-OS-UBUNTU-2204-CVE-2026-23068 and 2 more.