CVE-2025-21863: io_uring: prevent opcode speculation
In the Linux kernel, the following vulnerability has been resolved:
iouring: prevent opcode speculation
sqe->opcode is used for different tables, make sure we santitise it against speculations.
Other sources
In the Linux kernel, the following vulnerability has been resolved:
iouring: prevent opcode speculation
sqe-opcode is used for different tables, make sure we santitise it against speculations.
— IBM
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-21863?
CVE-2025-21863 has been assigned a moderate severity rating due to the potential exploitation of opcode speculation in the Linux kernel.
How do I fix CVE-2025-21863?
To fix CVE-2025-21863, ensure you update to the latest version of the Linux kernel where the vulnerability has been addressed.
What systems are affected by CVE-2025-21863?
CVE-2025-21863 affects the Linux kernel across all distributions that utilize the vulnerable version.
What is the nature of CVE-2025-21863?
CVE-2025-21863 is a vulnerability related to opcode speculation that can lead to unintended behavior in the Linux kernel.
Has CVE-2025-21863 been mitigated?
Yes, CVE-2025-21863 has been resolved in recent updates to the Linux kernel.