Threats Tagged 'cve-2025-40112'

A vulnerability in the Linux kernel related to the sparc architecture's copy_from_user and copy_to_user functions for Niagara has been resolved. The issue involved inaccurate exception reporting due to incorrect calculations and a broken epilogue in the exception handlers. This flaw could cause crashes and incorrect return values when user-space memory references fault during these copy operations. The vulnerability does not affect memcpy behavior. It has been fixed in the Linux kernel.

In the Linux kernel, the following vulnerability has been resolved: sparc: fix accurate exception reporting in copy_{from_to}_user for Niagara The referenced commit introduced exception handlers on user-space memory references in copy_from_user and copy_to_user. These handlers return from the respective function and calculate the remaining bytes left to copy using the current register contents. This commit fixes a couple of bad calculations and a broken epilogue in the exception handlers. This will prevent crashes and ensure correct return values of copy_from_user and copy_to_user in the faulting case. The behaviour of memcpy stays unchanged.