CVE-2026-93238
UnknownSummary
In the Linux kernel's s390/vfio-ap module, the apm_filtered bitmap is stack-allocated without zero-initialization. When a hot plug change adds only control domains, the filtering function is bypassed and the uninitialized bitmap is passed to reset_queues_for_apids(), potentially causing unintended guest hardware queue resets. The fix zero-initializes the bitmap at the start of the function.
Risk Assessment
May lead to unintended resets of guest hardware queues on s390x systems, causing service interruptions or data loss in virtualized environments.
Recommendation
Update the Linux kernel to a version with the s390/vfio-ap fix. Limit AP configuration hot plug operations until the update is deployed.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: fix potential use of uninitialized apm_filtered bitmap The DECLARE_BITMAP(apm_filtered, AP_DEVICES) macro allocates the bitmap on the stack without zero-initializing it. In vfio_ap_mdev_hot_plug_cfg(), the vfio_ap_mdev_filter_matrix() function is only called to initialize and populate apm_filtered if either filter_adapters or filter_domains is true. If the hot plug configuration change only adds control domains (meaning filter_cdoms is true, but filter_adapters and filter_domains are both false), vfio_ap_mdev_filter_matrix() is bypassed. Consequently, apm_filtered is passed to reset_queues_for_apids() with uninitialized stack garbage. This can cause reset_queues_for_apids() to interpret arbitrary stack garbage bits as valid APIDs to reset, potentially performing unintended guest hardware queue resets. Fix this by zero-initializing the apm_filtered bitmap at the beginning of vfio_ap_mdev_hot_plug_cfg() using bitmap_zero().
Vulnerability data from NVD (NIST) · CISA KEV · EPSS