CVE-2026-89792 ksmbd: prevent out-of-bounds reads in share config responses
An attacker can trigger out-of-bounds reads in ksmbd share config responses, potentially disclosing sensitive kernel memory.
- 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-2026-89792?
CVE-2026-89792 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:
ksmbd: prevent out-of-bounds reads in share config responses
Validate IPC share configuration payload sizes before consuming variable-length fields. Bound veto list parsing and account for the separator byte when deriving the path length.
Which versions are affected by CVE-2026-89792?
How do I fix CVE-2026-89792?
Apply the vendor's patch.
Is CVE-2026-89792 being exploited?
There is no known exploitation of CVE-2026-89792 in the wild and no public exploit code.
Sources
Also known as AZL-101150, BELL-CVE-2026-89792, DEBIAN-CVE-2026-89792, GHSA-5h65-jm98-j8f7, UBUNTU-CVE-2026-89792.