CVE-2026-64303 spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
A use-after-free vulnerability in the Linux kernel's fsl-lpspi driver allows attackers to cause memory corruption or execute code via a specific DMA failure path.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64303?
CVE-2026-64303 is a critical use after free vulnerability in Linux kernel, published on 25 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
When dmaengine_prep_slave_sg() fails for the TX channel, the error path terminates the TX DMA channel but leaves the RX channel running. Since the RX channel was already submitted and issued prior to preparing the TX descriptor, returning -EINVAL causes the SPI core to unmap the DMA buffers while the RX DMA engine continues writing to them, leading to potential memory corruption or use-after-free.
Terminate the RX channel before returning on the TX prepare failure path.
Weakness: CWE-416
Which versions are affected by CVE-2026-64303?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64303?
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-2026-64303 being exploited?
There is no known exploitation of CVE-2026-64303 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-93644, BELL-CVE-2026-64303, DEBIAN-CVE-2026-64303, GHSA-8g65-pg22-jqr9, ROOT-OS-DEBIAN-12-CVE-2026-64303, ROOT-OS-UBUNTU-2204-CVE-2026-64303 and 1 more.