Improper control of a resource through its lifetime in Linux kernel - CVE-2026-89795
Published: September 17, 2026
Vulnerability identifier: #VU150486
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89795
CWE-ID: CWE-664
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to reset an unintended PCI function and leak memory.
The vulnerability exists due to improper PCI slot assignment in the s390 PCI hotplug slot handling when requesting a function reset through the hotplug driver's slot_reset interface. A local user can request a reset for a PCI function to reset an unintended function and leak memory.
This occurs on s390 systems that expose the topology of multifunction PCI devices in a shared PCI domain.
Affected software
Linux kernel
How to mitigate CVE-2026-89795
Install security update from vendor's repository.