CVE-2026-31749

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> comedi: ni_atmio16d: Fix invalid clean-up after failed attach<br /> <br /> If the driver&amp;#39;s COMEDI "attach" handler function (`atmio16d_attach()`)<br /> returns an error, the COMEDI core will call the driver&amp;#39;s "detach"<br /> handler function (`atmio16d_detach()`) to clean up. This calls<br /> `reset_atmio16d()` unconditionally, but depending on where the error<br /> occurred in the attach handler, the device may not have been<br /> sufficiently initialized to call `reset_atmio16d()`. It uses<br /> `dev-&gt;iobase` as the I/O port base address and `dev-&gt;private` as the<br /> pointer to the COMEDI device&amp;#39;s private data structure. `dev-&gt;iobase`<br /> may still be set to its initial value of 0, which would result in<br /> undesired writes to low I/O port addresses. `dev-&gt;private` may still be<br /> `NULL`, which would result in null pointer dereferences.<br /> <br /> Fix `atmio16d_detach()` by checking that `dev-&gt;private` is valid<br /> (non-null) before calling `reset_atmio16d()`. This implies that<br /> `dev-&gt;iobase` was set correctly since that is set up before<br /> `dev-&gt;private`.