Integer underflow in Linux kernel - CVE-2026-93789
Published: September 25, 2026
Vulnerability identifier: #VU152105
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-93789
CWE-ID: CWE-191
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a length underflow.
The vulnerability exists due to improper validation of aligned TLV lengths in the iwlwifi firmware parser when processing malformed TLVs in a firmware image. A local user can cause the parser to process a firmware image containing malformed TLVs to cause a length underflow.
Affected software
Linux kernel
How to mitigate CVE-2026-93789
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3