CVE-2026-80876

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the ring-buffer where small events on architectures with RB FORCE 8BYTE ALIGNMENT set to true report a data length 4 bytes larger than expected. This occurs because rb calculate event length() and rb update event() unconditionally add extra space for the data length in event->array[0], but ring buffer event length() only subtracts this size for events larger than RB MAX SMALL DATA plus the size of event->array[0]. The problem was observed in riscv64 kernels with CONFIG HAVE 64BIT ALIGNED ACCESS enabled during ftrace selftests.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.