{"id":"CVE-2026-89795","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: Allow per function PCI slots to fix slot reset on s390\n\nOn s390 systems, which use a machine level hypervisor, PCI devices are\nalways accessed through a form of PC…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: Allow per function PCI slots to fix slot reset on s390\n\nOn s390 systems, which use a machine level hypervisor, PCI devices are\nalways accessed through a form of PC…","severity":"high","cvss":8.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 44510d6fa0c00aa90b80075caa6b313b25927475 < 2050d900f9adbd6d6f38d30e182bcd9ad3108467","Linux >= 44510d6fa0c00aa90b80075caa6b313b25927475 < ecdcceed4d377b02d4ea036b65f83f962c38ede7","Linux >= 44510d6fa0c00aa90b80075caa6b313b25927475 < dcc5bec09e23bbc4f9de055a11fce9937244f2c8","Linux 5.8"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:18:09.640","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89795","references":[{"url":"https://git.kernel.org/stable/c/2050d900f9adbd6d6f38d30e182bcd9ad3108467","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dcc5bec09e23bbc4f9de055a11fce9937244f2c8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ecdcceed4d377b02d4ea036b65f83f962c38ede7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T10:53:54.011Z","epss":0.00158,"epssPercentile":0.05326,"slug":"CVE-2026-89795","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nPCI: Allow per function PCI slots to fix slot reset on s390\n\nOn s390 systems, which use a machine level hypervisor, PCI devices are\nalways accessed through a form of PCI pass-through which fundamentally\noperates on a per PCI function granularity. This is also reflected in the\ns390 PCI hotplug driver which creates hotplug slots for individual PCI\nfunctions. Its reset_slot() function, which is a wrapper for\nzpci_hot_reset_device(), thus also resets individual functions.\n\nCurrently, the pci_create_slot() assigns the same pci_slot object to\nmultifunction devices. This approach worked fine on s390 systems that only\nexposed virtual functions as individual PCI domains to the operating\nsystem.  Since commit 44510d6fa0c0 (\"s390/pci: Handling multifunctions\")\ns390 supports exposing the topology of multifunction PCI devices by\ngrouping them in a shared PCI domain. This creates a problem when resetting\na function through the hotplug driver's slot_reset() interface.\n\nWhen attempting to reset a function through the hotplug driver, the shared\nslot assignment causes the wrong function to be reset instead of the\nintended one. It also leaks memory as we do create a pci_slot object for\nthe function, but don't correctly free it in pci_slot_release().\n\nAdd a flag for struct pci_slot to allow per function PCI slots for\nfunctions managed through a hypervisor, which exposes individual PCI\nfunctions while retaining the topology. Since we can use all 8 bits for\nslot 'number' (for ARI devices), change slot 'number' u16 to account for\nspecial values PCI_SLOT_PLACEHOLDER and PCI_SLOT_ALL_DEVICES.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":46.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205249,"id":"CVE-2026-89795","ts":1789570705924,"field":"cvss","old":null,"new":"8.4"},{"seq":205248,"id":"CVE-2026-89795","ts":1789570705924,"field":"severity","old":"none","new":"high"}]}