CVE-2026-72146 dmaengine: sh: rz-dmac: Move interrupt request after everything is set up
A race condition in the RZ-DMAC driver allows invalid memory access if an interrupt fires before initialization, potentially causing a kernel crash.
- 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-2026-72146?
CVE-2026-72146 is a high-severity vulnerability in Linux, published on 15 Aug 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:
dmaengine: sh: rz-dmac: Move interrupt request after everything is set up
Once the interrupt is requested, the interrupt handler may run immediately. Since the IRQ handler can access channel->ch_base, which is initialized only after requesting the IRQ, this may lead to invalid memory access. Likewise, the IRQ thread may access uninitialized data (the ld_free, ld_queue, and ld_active lists), which may also lead to issues.
Request the interrupts only after everything is set up. To keep the error path simpler, use dmam_alloc_coherent() instead of dma_alloc_coherent().
Which versions are affected by CVE-2026-72146?
How do I fix CVE-2026-72146?
Apply the vendor's patch.
Is CVE-2026-72146 being exploited?
There is no known exploitation of CVE-2026-72146 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-72146, DEBIAN-CVE-2026-72146, GHSA-87f6-c6f3-59h3, UBUNTU-CVE-2026-72146.