CVE-2026-23093 ksmbd: smbd: fix dma_unmap_sg() nents
Incorrect DMA unmapping in the Linux kernel SMB server can lead to system instability or crashes, requiring a kernel patch.
- 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-2026-23093?
CVE-2026-23093 is a medium-severity 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:
ksmbd: smbd: fix dma_unmap_sg() nents
The dma_unmap_sg() functions should be called with the same nents as the dma_map_sg(), not the value the map function returned.
Which versions are affected by CVE-2026-23093?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23093?
Apply the vendor's patch.
Is CVE-2026-23093 being exploited?
There is no known exploitation of CVE-2026-23093 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-23093, DEBIAN-CVE-2026-23093, GHSA-wm77-g5xw-58c7, ROOT-OS-UBUNTU-2204-CVE-2026-23093, ROOT-OS-UBUNTU-2404-CVE-2026-23093, UBUNTU-CVE-2026-23093.