CVE-2026-89995 dma-direct: return struct page from dma_direct_alloc_from_pool()
A type confusion in the Linux kernel DMA allocator causes a null pointer dereference, leading to a system 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-2026-89995?
CVE-2026-89995 is a high-severity vulnerability in Linux, published on 16 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:
dma-direct: return struct page from dma_direct_alloc_from_pool()
Commit 5b138c534fda ("dma-direct: factor out a dma_direct_alloc_from_pool helper") changed dma_direct_alloc_from_pool() to return the CPU address from dma_alloc_from_pool(). That fits dma_direct_alloc(), but dma_direct_alloc_pages() also uses the helper and expects a struct page *.
Fix this by making dma_direct_alloc_from_pool() return the struct page * again, and pass the CPU address back through an out-parameter for the dma_direct_alloc() caller.
Which versions are affected by CVE-2026-89995?
How do I fix CVE-2026-89995?
Apply the vendor's patch.
Is CVE-2026-89995 being exploited?
There is no known exploitation of CVE-2026-89995 in the wild and no public exploit code.
Sources
Also known as AZL-101649, BELL-CVE-2026-89995, DEBIAN-CVE-2026-89995, GHSA-36w9-6524-pc79, UBUNTU-CVE-2026-89995.