IT

Tracker / CVE-2025-38478

CVE-2025-38478

High 7.8

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.

Affected products and versions

debian debian_linux
linux linux_kernel
linux linux_kernel · 2.6.29 → 5.4.297
linux linux_kernel · 5.11 → 5.15.190
linux linux_kernel · 5.16 → 6.1.147
linux linux_kernel · 5.5 → 5.10.241
linux linux_kernel · 6.13 → 6.15.8
linux linux_kernel · 6.2 → 6.6.100
linux linux_kernel · 6.7 → 6.12.40

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References