Numeric Truncation Error in Linux kernel - CVE-2026-90100
Published: September 19, 2026
Vulnerability identifier: #VU151388
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90100
CWE-ID: CWE-197
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to numeric truncation in the NETC PTP PEROUT configuration handling when configuring periodic output with an oversized period. A local user can configure a period that is truncated to zero to cause a denial of service.
The divide-by-zero condition is reached when the configured start time is {0, 0}; a zero period can also cause unsigned wraparound when programming the FIPER register.
Affected software
Linux kernel
How to mitigate CVE-2026-90100
Install security update from vendor's repository.