CVE-2026-81007 ipmi: ipmb: validate write message length
A local attacker can read uninitialized stack memory via a crafted IPMB write message due to missing length validation in the Linux kernel.
- 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-2026-81007?
CVE-2026-81007 is a high-severity vulnerability in Linux, published on 11 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:
ipmi: ipmb: validate write message length
ipmb_write() read message fields before validating the length byte.
A zero or short write can read uninitialized stack bytes.
A length smaller than the SMBus header underflows the block write length.
Require a non-empty buffer and the minimum IPMB request length.
Also require the length byte plus payload before parsing the message.
Which versions are affected by CVE-2026-81007?
How do I fix CVE-2026-81007?
Apply the vendor's patch.
Is CVE-2026-81007 being exploited?
There is no known exploitation of CVE-2026-81007 in the wild and no public exploit code.
Sources
Also known as AZL-100478, BELL-CVE-2026-81007, DEBIAN-CVE-2026-81007, GHSA-7w7r-xvw6-m4c6, UBUNTU-CVE-2026-81007.