CyberRota Analysis
AI-GeneratedThe vulnerability in the Linux kernel affects the coresight subsystem, specifically the SMB sink used for performance data collection, allowing for an out-of-bounds write due to improper handling of the buffer size. This can lead to memory corruption, potentially allowing an attacker to execute arbitrary code or crash the system. Organizations using Linux systems that leverage the coresight performance monitoring features should prioritize patching this vulnerability to mitigate the associated risks.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: coresight: ultrasoc-smb: Fix OOB write in smb_sync_perf_buffer() When the SMB sink is used as a perf AUX sink, smb_update_buffer() calls smb_sync_perf_buffer() to copy hardware trace data into the perf AUX ring buffer pages. It derives pg_idx = head >> PAGE_SHIFT from @head, which is handle->head, and indexes dst_pages[pg_idx]. The pg_idx %= nr_pages normalization is only applied after the first loop iteration. This leaves the initial page index underived from the buffer size, which can result in an out-of-bounds write past dst_pages[] when head exceeds the AUX buffer size. Normalize head modulo the AUX buffer size before deriving the page index and offset, mirroring tmc_etr_sync_perf_buffer().