CVE-2026-43141 ntb: ntb_hw_switchtec: Fix shift-out-of-bounds for 0 mw lut
A shift-out-of-bounds error in the Linux kernel NTB driver can cause undefined behavior and denial of service when MW LUTs are zero.
- 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-2026-43141?
CVE-2026-43141 is a high-severity vulnerability in Linux kernel, published on 6 May 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:
ntb: ntb_hw_switchtec: Fix shift-out-of-bounds for 0 mw lut
Number of MW LUTs depends on NTB configuration and can be set to zero, in such scenario rounddown_pow_of_two will cause undefined behaviour and should not be performed. This patch ensures that rounddown_pow_of_two is called on valid value.
Weakness: CWE-125
Which versions are affected by CVE-2026-43141?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43141?
Apply the vendor's patch.
Is CVE-2026-43141 being exploited?
There is no known exploitation of CVE-2026-43141 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43141, DEBIAN-CVE-2026-43141, GHSA-w255-hqmv-g27g, ROOT-OS-DEBIAN-11-CVE-2026-43141, ROOT-OS-UBUNTU-2204-CVE-2026-43141, ROOT-OS-UBUNTU-2404-CVE-2026-43141 and 1 more.