Integer underflow in Linux kernel - CVE-2026-43141
Published: May 7, 2026
Vulnerability identifier: #VU130599
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-43141
CWE-ID: CWE-191
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an integer underflow in ntb_hw_switchtec when handling an NTB configuration with zero memory window lookup tables. A local user can trigger the vulnerable code path to cause a denial of service.
The issue occurs when the number of memory window lookup tables is set to zero.
How to mitigate CVE-2026-43141
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/186615f8855a0be4ee7d3fcd09a8ecc10e783b08
- https://git.kernel.org/stable/c/1a867d0d79a4a570a33f2f433919ad2bd7a27b67
- https://git.kernel.org/stable/c/2e4d5e8d86a969318340be95470bb76e52392082
- https://git.kernel.org/stable/c/5590cd04d6845c01a6bad985a491c58af6fb5389
- https://git.kernel.org/stable/c/a11d03d116eef138a7249202bd772c8e61915aec
- https://git.kernel.org/stable/c/a133e3caf844a3f56b6eef89ddaa66115874f6bd
- https://git.kernel.org/stable/c/d0559d07afabfddaaded6a61a16154486b956764
- https://git.kernel.org/stable/c/d652ef399f131fcd5f8f34266167449ee7c9e5b3