CVE-2025-38478
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
Summary
In the Comedi subsystem of the Linux kernel, do_insn_ioctl() and do_insnlist_ioctl() allocate at least 16 data elements for instructions but do not initialize all of them. For write-to-subdevice instructions, uncopied elements remain uninitialized, potentially causing the handler to read uninitialized memory.
Risk Assessment
Information leak or unexpected behavior may occur when the subdevice handler reads uninitialized data.
Recommendation
Apply the patch that initializes the first MIN_SAMPLES (16) data elements to zero before calling handlers for write-to-subdevice instructions.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: comedi: Fix initialization of data for instructions that write to subdevice Some Comedi subdevice instruction handlers are known to access instruction data elements beyond the first `insn->n` elements in some cases. The `do_insn_ioctl()` and `do_insnlist_ioctl()` functions allocate at least `MIN_SAMPLES` (16) data elements to deal with this, but they do not initialize all of that. For Comedi instruction codes that write to the subdevice, the first `insn->n` data elements are copied from user-space, but the remaining elements are left uninitialized. That could be a problem if the subdevice instruction handler reads the uninitialized data. Ensure that the first `MIN_SAMPLES` elements are initialized before calling these instruction handlers, filling the uncopied elements with 0. For `do_insnlist_ioctl()`, the same data buffer elements are used for handling a list of instructions, so ensure the first `MIN_SAMPLES` elements are initialized for each instruction that writes to the subdevice.