Reliance on undefined behavior in Linux kernel - CVE-2026-92505
Published: September 18, 2026
Vulnerability identifier: #VU151006
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-2026-92505
CWE-ID: CWE-758
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to trigger undefined behavior.
The vulnerability exists due to reliance on undefined behavior in the AMD IOMMU devid_write debugfs function when processing a device ID for which no matching PCI segment is found. A local user can write such a device ID to the debugfs interface to trigger undefined behavior.
Affected software
Linux kernel
How to mitigate CVE-2026-92505
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3