CVE-2025-71203 riscv: Sanitize syscall table indexing under speculation
Attackers can exploit speculative execution flaws in the RISC-V Linux kernel to leak sensitive data via cache side channels.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-71203?
CVE-2025-71203 is a high-severity vulnerability in Linux kernel, published on 14 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
riscv: Sanitize syscall table indexing under speculation
The syscall number is a user-controlled value used to index into the syscall table. Use array_index_nospec() to clamp this value after the bounds check to prevent speculative out-of-bounds access and subsequent data leakage via cache side channels.
Weakness: CWE-129
Which versions are affected by CVE-2025-71203?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-71203?
Apply the vendor's patch.
Is CVE-2025-71203 being exploited?
There is no known exploitation of CVE-2025-71203 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-77757, BELL-CVE-2025-71203, DEBIAN-CVE-2025-71203, GHSA-xph2-5pq4-m7jp, ROOT-OS-DEBIAN-13-CVE-2025-71203, ROOT-OS-UBUNTU-2204-CVE-2025-71203 and 2 more.