CVE-2025-37866 mlxbf-bootctl: use sysfs_emit_at() in secure_boot_fuse_state_show()
A kernel warning occurs in the mlxbf-bootctl driver due to incorrect sysfs buffer usage, potentially causing instability on BlueField SOC systems.
- 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-2025-37866?
CVE-2025-37866 is a medium-severity vulnerability in Linux kernel, published on 9 May 2025. 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:
mlxbf-bootctl: use sysfs_emit_at() in secure_boot_fuse_state_show()
A warning is seen when running the latest kernel on a BlueField SOC: [251.512704] ------------[ cut here ]------------ [251.512711] invalid sysfs_emit: buf:0000000003aa32ae [251.512720] WARNING: CPU: 1 PID: 705264 at fs/sysfs/file.c:767 sysfs_emit+0xac/0xc8
The warning is triggered because the mlxbf-bootctl driver invokes "sysfs_emit()" with a buffer pointer that is not aligned to the start of the page. The driver should instead use "sysfs_emit_at()" to support non-zero offsets into the destination buffer.
Which versions are affected by CVE-2025-37866?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-37866?
Apply the vendor's patch.
Is CVE-2025-37866 being exploited?
There is no known exploitation of CVE-2025-37866 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-37866, GHSA-3p47-qj26-6gg7, UBUNTU-CVE-2025-37866.