CyberRota Analysis
AI-GeneratedThe vulnerability in the Linux kernel affects the s390/dasd subsystem, where a failed ESE read operation can incorrectly be marked as successful, leading to the potential exposure of stale or uninitialized memory. This flaw could allow attackers to exploit unallocated ESE tracks, resulting in data leakage or corruption. Organizations using affected Linux systems, particularly those leveraging the s390 architecture, should prioritize addressing this issue to mitigate risks associated with memory handling vulnerabilities.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: s390/dasd: Do not complete a failed ESE read as successful dasd_int_handler() completes an NRF read of an unallocated ESE track by calling ese_read() and unconditionally marking the request DASD_CQR_SUCCESS. dasd_eckd_ese_read() can return an error before it has zeroed the destination buffer: a failed sense-data parse or a current track outside the requested range both return early, leaving the destination pages untouched. The request is still completed successfully, so the block layer is handed stale / uninitialized memory instead of zeros. Check the ese_read() return value and fail the request through the normal error path instead of forcing DASD_CQR_SUCCESS.