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CVE-2026-89795: Linux

8.4

CVSS 3.1

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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Атакува се

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Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: PCI: Allow per function PCI slots to fix slot reset on s390 On s390 systems, which use a machine level hypervisor, PCI devices are always accessed through a form of PCI pass-through which fundamentally operates on a per PCI function granularity. This is also reflected in the s390 PCI hotplug driver which creates hotplug slots for individual PCI functions. Its reset_slot() function, which is a wrapper for zpci_hot_reset_device(), thus also resets individual functions. Currently, the pci_create_slot() assigns the same pci_slot object to multifunction devices. This approach worked fine on s390 systems that only exposed virtual functions as individual PCI domains to the operating system. Since commit 44510d6fa0c0 ("s390/pci: Handling multifunctions") s390 supports exposing the topology of multifunction PCI devices by grouping them in a shared PCI domain. This creates a problem when resetting a function through the hotplug driver's slot_reset() interface. When attempting to reset a function through the hotplug driver, the shared slot assignment causes the wrong function to be reset instead of the intended one. It also leaks memory as we do create a pci_slot object for the function, but don't correctly free it in pci_slot_release(). Add a flag for struct pci_slot to allow per function PCI slots for functions managed through a hypervisor, which exposes individual PCI functions while retaining the topology. Since we can use all 8 bits for slot 'number' (for ARI devices), change slot 'number' u16 to account for special values PCI_SLOT_PLACEHOLDER and PCI_SLOT_ALL_DEVICES.

    Засегнати продукти

    • Linux Linux: 44510d6fa0c00aa90b80075caa6b313b25927475 преди afdd497ca3836eda13530ab75b416d52f6d6129a; 44510d6fa0c00aa90b80075caa6b313b25927475 преди b4a80e9e639cf09ef5c66b7f262c9cb5ab37bdde; 44510d6fa0c00aa90b80075caa6b313b25927475 преди 0d1a7d67f45645106578d65181e4e492dd20ed79; 44510d6fa0c00aa90b80075caa6b313b25927475 преди 2050d900f9adbd6d6f38d30e182bcd9ad3108467; 44510d6fa0c00aa90b80075caa6b313b25927475 преди ecdcceed4d377b02d4ea036b65f83f962c38ede7; 44510d6fa0c00aa90b80075caa6b313b25927475 преди dcc5bec09e23bbc4f9de055a11fce9937244f2c8
    • Linux Linux: 5.8; преди 5.8; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.112 до 6.12.*; 6.18.52 до 6.18.*; 7.2.5 до 7.2.*; от 7.3 нататък

    История

    • 16 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-89795: Linux | freedomonline.bg