CVE-2025-21863: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: io_uring: prevent opcode speculation sqe->opcode is used for different tables, make sure we santitise it against speculations.

Affected products

• Linux Linux Kernel: from 5.6, before 6.6.80 (fixed in 6.6.80); from 6.7, before 6.12.17 (fixed in 6.12.17); from 6.13, before 6.13.5 (fixed in 6.13.5); version 6.14 only

Published 2025-03-12. Last modified 2026-09-08.