CVE-2026-59144
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk37th percentile - higher than 37% of all known CVEs
Summary
The Data::RingBuffer::Shared module for Perl before version 0.04 contains a stack buffer overflow via an unvalidated elem_size in ring_read_seq. The ring_read_seq function copies data of size elem_size (read from an mmap'd file) into a fixed 8-byte destination buffer, potentially leading to stack-based write.
Risk Assessment
A local attacker who can write to the backing file can set a large elem_size, causing corruption of adjacent stack frames and potentially arbitrary code execution.
Recommendation
Update the Data::RingBuffer::Shared module to version 0.04 or later, which includes validation of elem_size.
Original NVD description (English source)
Data::RingBuffer::Shared versions before 0.04 for Perl allow a stack buffer overflow via an unvalidated elem_size in ring_read_seq. The attach-time validator ring_validate_header checks the capacity-overflow and total_size consistency of the header but never caps elem_size against the destination size. ring_read_seq does memcpy(out, ring_slot(h, seq), elem_size) with elem_size read raw from the mmap'd segment, copying into a fixed 8-byte destination scalar. An elem_size larger than 8 bytes writes past the destination. A local peer that can write the backing file can leave the header valid while setting a large elem_size, so the next read copies a file-controlled length into the fixed 8-byte stack buffer, corrupting adjacent stack frames.