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CVE-2026-89956: Linux

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: Fix missing lock required to access list of ap_matrix_mdev objects In order to traverse or add/remove ap_matrix_mdev objects in the matrix_dev->mdev_list, the matrix_dev->guests_lock mutex must be held. There are two functions that access the list without holding the mutex: vfio_ap_mdev_probe function ~~~~~~~~~~~~~~~~~~~~~~~~~~~ The vfio_ap_mdev_probe function uses the matrix_dev->mdevs_lock mutex to guard the add of a newly created ap_matrix_mdev object to the matrix_dev->mdev_list. This mutex does not protect list access; its purpose is to guard against concurrent access to fields contained in an ap_matrix_mdev object. This could lead to kernel memory corruption or use-after-free if another mdev is created or removed concurrently. The adding of an ap_matrix_mdev object to matrix_dev->mdev_list is now guarded by the matrix_dev->guests_lock which is the correct way to protect against concurrent mdev_list access. Also removed the following two lines of code because the matrix_mdev is allocated via vfio_alloc_device macro which uses kzalloc, so req_trigger and cfg_chg_trigger are already zero-initialised when the struct is allocated before the call to vfio_register_emulated_iommu_dev. This prevents a window whereby these triggers are set to NULL after the device is exposed to userspace. matrix_mdev->req_trigger = NULL; matrix_mdev->cfg_chg_trigger = NULL; vfio_ap_mdev_for_queue function ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The status_show function that supports display of the status attribute of the devices in /sys/bus/ap/devices calls the vfio_ap_mdev_for_queue function which iterates the matrix_dev->mdev_list to find the object representing the queue device whose status is to be displayed. In order to traverse this list, the matrix_dev->guests_lock mutex must be held. To fix this, the guests_lock mutex is taken prior to taking the matrix_dev->mdevs_lock mutex in the status_show func

    Засегнати продукти

    • Linux Linux: 2c1ee8983aa377fef4f725162f4f3aa5f9575d4a преди 3ea443510739468238324234eaab0d37922283f5; 2c1ee8983aa377fef4f725162f4f3aa5f9575d4a преди 22dc712c170efc1a549e3f872467c880be995ac7; 2c1ee8983aa377fef4f725162f4f3aa5f9575d4a преди 530ee1cc71562b6799b9ece187b6c1b757a2c6fa; 2c1ee8983aa377fef4f725162f4f3aa5f9575d4a преди 647916988272fe5ecb4bb30cd02b51af9960618a; 2c1ee8983aa377fef4f725162f4f3aa5f9575d4a преди 0fd74477d05743d4cd9b25a3b667daa278d53b93; 2c1ee8983aa377fef4f725162f4f3aa5f9575d4a преди 7fa61c29850d05e40ca9ed41bfdf57673023f581
    • Linux Linux: 6.0; преди 6.0; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.112 до 6.12.*; 6.18.51 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-2026-89956: Linux | freedomonline.bg