CVE-2026-72064 net: mana: Sync page pool RX frags for CPU
Missing DMA synchronization in the MANA network driver causes RX failures and denial of service on systems using swiotlb=force.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72064?
CVE-2026-72064 is a critical vulnerability in Linux, published on 15 Aug 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:
net: mana: Sync page pool RX frags for CPU
MANA allocates RX buffers from page pool fragments when frag_count is greater than 1. In that case the buffers remain DMA mapped by page pool and the RX completion path does not call dma_unmap_single(). As a result, the implicit sync-for-CPU normally performed by dma_unmap_single() is missing before the packet data is passed to the networking stack.
This breaks RX on configurations which require explicit DMA syncing, for example when booted with swiotlb=force.
Fix this by recording the page pool page and DMA sync offset when the RX buffer is allocated, and syncing the received packet range for CPU access before handing the RX buffer to the stack.
Weakness: CWE-362
Which versions are affected by CVE-2026-72064?
How do I fix CVE-2026-72064?
Apply the vendor's patch.
Is CVE-2026-72064 being exploited?
There is no known exploitation of CVE-2026-72064 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-72064, DEBIAN-CVE-2026-72064, GHSA-fh7x-649r-3p95, UBUNTU-CVE-2026-72064.